platform/kernel/linux-starfive.git
4 years agoALSA: hda: Intel: add missing PCI IDs for ICL-H, TGL-H and EKL
Pierre-Louis Bossart [Wed, 17 Jun 2020 16:49:09 +0000 (11:49 -0500)]
ALSA: hda: Intel: add missing PCI IDs for ICL-H, TGL-H and EKL

Mirror PCI ids used for SOF.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200617164909.18225-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agoblock: update hctx map when use multiple maps
Weiping Zhang [Wed, 17 Jun 2020 06:18:37 +0000 (14:18 +0800)]
block: update hctx map when use multiple maps

There is an issue when tune the number for read and write queues,
if the total queue count was not changed. The hctx->type cannot
be updated, since __blk_mq_update_nr_hw_queues will return directly
if the total queue count has not been changed.

Reproduce:

dmesg | grep "default/read/poll"
[    2.607459] nvme nvme0: 48/0/0 default/read/poll queues
cat /sys/kernel/debug/block/nvme0n1/hctx*/type | sort | uniq -c
     48 default

tune the write queues to 24:
echo 24 > /sys/module/nvme/parameters/write_queues
echo 1 > /sys/block/nvme0n1/device/reset_controller

dmesg | grep "default/read/poll"
[  433.547235] nvme nvme0: 24/24/0 default/read/poll queues

cat /sys/kernel/debug/block/nvme0n1/hctx*/type | sort | uniq -c
     48 default

The driver's hardware queue mapping is not same as block layer.

Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agodrm/amdgpu: fix documentation around busy_percentage
Alex Deucher [Mon, 15 Jun 2020 20:36:49 +0000 (16:36 -0400)]
drm/amdgpu: fix documentation around busy_percentage

Add rename the gpu busy percentage for consistency and
add the mem busy percentage documentation.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 years agodrm/amdgpu/pm: update comment to clarify Overdrive interfaces
Alex Deucher [Mon, 15 Jun 2020 18:29:55 +0000 (14:29 -0400)]
drm/amdgpu/pm: update comment to clarify Overdrive interfaces

Vega10 and previous asics use one interface, vega20 and newer
use another.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 years agodrm/amdkfd: Use correct major in devcgroup check
Lorenz Brun [Thu, 11 Jun 2020 20:11:21 +0000 (22:11 +0200)]
drm/amdkfd: Use correct major in devcgroup check

The existing code used the major version number of the DRM driver
instead of the device major number of the DRM subsystem for
validating access for a devices cgroup.

This meant that accesses allowed by the devices cgroup weren't
permitted and certain accesses denied by the devices cgroup were
permitted (if they matched the wrong major device number).

Signed-off-by: Lorenz Brun <lorenz@brun.one>
Fixes: 6b855f7b83d2f ("drm/amdkfd: Check against device cgroup")
Reviewed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
4 years agoselinux: fix undefined return of cond_evaluate_expr
Tom Rix [Wed, 17 Jun 2020 12:40:28 +0000 (05:40 -0700)]
selinux: fix undefined return of cond_evaluate_expr

clang static analysis reports an undefined return

security/selinux/ss/conditional.c:79:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
        return s[0];
        ^~~~~~~~~~~

static int cond_evaluate_expr( ...
{
u32 i;
int s[COND_EXPR_MAXDEPTH];

for (i = 0; i < expr->len; i++)
  ...

return s[0];

When expr->len is 0, the loop which sets s[0] never runs.

So return -1 if the loop never runs.

Cc: stable@vger.kernel.org
Signed-off-by: Tom Rix <trix@redhat.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
4 years agoftrace: Fix maybe-uninitialized compiler warning
Kaitao Cheng [Fri, 29 May 2020 14:12:14 +0000 (22:12 +0800)]
ftrace: Fix maybe-uninitialized compiler warning

During build compiler reports some 'false positive' warnings about
variables {'seq_ops', 'filtered_pids', 'other_pids'} may be used
uninitialized. This patch silences these warnings.
Also delete some useless spaces

Link: https://lkml.kernel.org/r/20200529141214.37648-1-pilgrimtao@gmail.com
Signed-off-by: Kaitao Cheng <pilgrimtao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agonvdimm/region: always show the 'align' attribute
Vishal Verma [Wed, 20 May 2020 22:50:26 +0000 (16:50 -0600)]
nvdimm/region: always show the 'align' attribute

It is possible that a platform that is capable of 'namespace labels'
comes up without the labels properly initialized. In this case, the
region's 'align' attribute is hidden. Howerver, once the user does
initialize he labels, the 'align' attribute still stays hidden, which is
unexpected.

The sysfs_update_group() API is meant to address this, and could be
called during region probe, but it has entanglements with the device
'lockdep_mutex'. Therefore, simply make the 'align' attribute always
visible. It doesn't matter what it says for label-less namespaces, since
it is not possible to change their allocation anyway.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/20200520225026.29426-1-vishal.l.verma@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
4 years agoio_uring: reap poll completions while waiting for refs to drop on exit
Jens Axboe [Wed, 17 Jun 2020 21:00:04 +0000 (15:00 -0600)]
io_uring: reap poll completions while waiting for refs to drop on exit

If we're doing polled IO and end up having requests being submitted
async, then completions can come in while we're waiting for refs to
drop. We need to reap these manually, as nobody else will be looking
for them.

Break the wait into 1/20th of a second time waits, and check for done
poll completions if we time out. Otherwise we can have done poll
completions sitting in ctx->poll_list, which needs us to reap them but
we're just waiting for them.

Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agos390: fix syscall_get_error for compat processes
Dmitry V. Levin [Tue, 2 Jun 2020 18:00:51 +0000 (21:00 +0300)]
s390: fix syscall_get_error for compat processes

If both the tracer and the tracee are compat processes, and gprs[2]
is assigned a value by __poke_user_compat, then the higher 32 bits
of gprs[2] are cleared, IS_ERR_VALUE() always returns false, and
syscall_get_error() always returns 0.

Fix the implementation by sign-extending the value for compat processes
the same way as x86 implementation does.

The bug was exposed to user space by commit 201766a20e30f ("ptrace: add
PTRACE_GET_SYSCALL_INFO request") and detected by strace test suite.

This change fixes strace syscall tampering on s390.

Link: https://lkml.kernel.org/r/20200602180051.GA2427@altlinux.org
Fixes: 753c4dd6a2fa2 ("[S390] ptrace changes")
Cc: Elvira Khabirova <lineprinter@altlinux.org>
Cc: stable@vger.kernel.org # v2.6.28+
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
4 years agos390/qdio: warn about unexpected SLSB states
Julian Wiedmann [Tue, 2 Jun 2020 12:26:36 +0000 (14:26 +0200)]
s390/qdio: warn about unexpected SLSB states

The way we produce SBALs to the device (first update q->nr_buf_used,
then update the SLSB) should ensure that we never see some of the
SLSB states when scanning the queue for progress.
So make some noise if we do, this implies a bug in our SBAL tracking.

Also tweak the WARN msg to provide more information.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
4 years agos390/qdio: clean up usage of qdio_data
Julian Wiedmann [Tue, 2 Jun 2020 12:23:32 +0000 (14:23 +0200)]
s390/qdio: clean up usage of qdio_data

This removes the last remaining accesses to ->qdio_data from internal
code. Just pass the qdio_irq struct where needed instead.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
4 years agoMerge series "ASoC: SOF: Intel: update PCI IDs" from Pierre-Louis Bossart <pierre...
Mark Brown [Wed, 17 Jun 2020 19:28:31 +0000 (20:28 +0100)]
Merge series "ASoC: SOF: Intel: update PCI IDs" from Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>:

Clean-up CometLake and add missing PCI IDs. Changes for the legacy
driver are sent separately.

Pierre-Louis Bossart (3):
  ASoC: Intel: SOF: merge COMETLAKE_LP and COMETLAKE_H
  ASoC: SOF: Intel: add PCI ID for CometLake-S
  ASoC: SOF: Intel: add PCI IDs for ICL-H and TGL-H

 sound/hda/intel-dsp-config.c   |  4 +---
 sound/soc/intel/boards/Kconfig |  4 ++--
 sound/soc/sof/intel/Kconfig    | 29 ++++++++---------------------
 sound/soc/sof/sof-pci-dev.c    | 24 ++++++++++++++----------
 4 files changed, 25 insertions(+), 36 deletions(-)

--
2.20.1

4 years agoASoC: hdac_hda: fix memleak with regmap not freed on remove
Pierre-Louis Bossart [Wed, 17 Jun 2020 16:41:44 +0000 (11:41 -0500)]
ASoC: hdac_hda: fix memleak with regmap not freed on remove

kmemleak throws error reports on module load/unload tests, add
snd_hdac_regmap_exit() in .remove().

While we are at it, also fix the error handling flow in .probe() to
use snd_hdac_regmap_exit() if needed.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200617164144.17859-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoASoC: SOF: Intel: add PCI IDs for ICL-H and TGL-H
Pierre-Louis Bossart [Wed, 17 Jun 2020 16:47:55 +0000 (11:47 -0500)]
ASoC: SOF: Intel: add PCI IDs for ICL-H and TGL-H

Usually the DSP is not traditionally enabled on H skews but this might
be used moving forward.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200617164755.18104-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoASoC: SOF: Intel: add PCI ID for CometLake-S
Pierre-Louis Bossart [Wed, 17 Jun 2020 16:47:54 +0000 (11:47 -0500)]
ASoC: SOF: Intel: add PCI ID for CometLake-S

Mirror ID added for legacy HDaudio

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200617164755.18104-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoASoC: Intel: SOF: merge COMETLAKE_LP and COMETLAKE_H
Pierre-Louis Bossart [Wed, 17 Jun 2020 16:47:53 +0000 (11:47 -0500)]
ASoC: Intel: SOF: merge COMETLAKE_LP and COMETLAKE_H

We already have two configurations for CometLake, and a third one
coming. On other platforms, we used a single Kconfig option, so we
should follow the same trend by merging the two cases in a backwards
compatible way.

The backwards compatibility is handled by overloading the COMETLAKE_LP
kconfig as COMETLAKE. In practice we've never seen a case where
COMETLAKE_H is not selected along with COMETLAKE_LP, so keeping one
of the two is enough.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200617164755.18104-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoio_uring: acquire 'mm' for task_work for SQPOLL
Jens Axboe [Wed, 17 Jun 2020 00:42:49 +0000 (18:42 -0600)]
io_uring: acquire 'mm' for task_work for SQPOLL

If we're unlucky with timing, we could be running task_work after
having dropped the memory context in the sq thread. Since dropping
the context requires a runnable task state, we cannot reliably drop
it as part of our check-for-work loop in io_sq_thread(). Instead,
abstract out the mm acquire for the sq thread into a helper, and call
it from the async task work handler.

Cc: stable@vger.kernel.org # v5.7
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoio_uring: add memory barrier to synchronize io_kiocb's result and iopoll_completed
Xiaoguang Wang [Mon, 15 Jun 2020 18:06:38 +0000 (02:06 +0800)]
io_uring: add memory barrier to synchronize io_kiocb's result and iopoll_completed

In io_complete_rw_iopoll(), stores to io_kiocb's result and iopoll
completed are two independent store operations, to ensure that once
iopoll_completed is ture and then req->result must been perceived by
the cpu executing io_do_iopoll(), proper memory barrier should be used.

And in io_do_iopoll(), we check whether req->result is EAGAIN, if it is,
we'll need to issue this io request using io-wq again. In order to just
issue a single smp_rmb() on the completion side, move the re-submit work
to io_iopoll_complete().

Cc: stable@vger.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
[axboe: don't set ->iopoll_completed for -EAGAIN retry]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoio_uring: don't fail links for EAGAIN error in IOPOLL mode
Xiaoguang Wang [Mon, 15 Jun 2020 18:06:37 +0000 (02:06 +0800)]
io_uring: don't fail links for EAGAIN error in IOPOLL mode

In IOPOLL mode, for EAGAIN error, we'll try to submit io request
again using io-wq, so don't fail rest of links if this io request
has links.

Cc: stable@vger.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoMerge tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping
Linus Torvalds [Wed, 17 Jun 2020 18:29:37 +0000 (11:29 -0700)]
Merge tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "Fixes for the SEV atomic pool (Geert Uytterhoeven and David Rientjes)"

* tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping:
  dma-pool: decouple DMA_REMAP from DMA_COHERENT_POOL
  dma-pool: fix too large DMA pools on medium memory size systems

4 years agomaccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault
Christoph Hellwig [Wed, 17 Jun 2020 07:37:54 +0000 (09:37 +0200)]
maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault

Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomaccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
Christoph Hellwig [Wed, 17 Jun 2020 07:37:53 +0000 (09:37 +0200)]
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault

Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agotools headers UAPI: Sync linux/fs.h with the kernel sources
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 13:23:51 +0000 (10:23 -0300)]
tools headers UAPI: Sync linux/fs.h with the kernel sources

To pick the changes from:

  b383a73f2b83 ("fs/ext4: Introduce DAX inode flag")

And silence this perf build warning:

  Warning: Kernel ABI header at 'tools/include/uapi/linux/fs.h' differs from latest version at 'include/uapi/linux/fs.h'
  diff -u tools/include/uapi/linux/fs.h include/uapi/linux/fs.h

It causes various beautifiers for things like fspick, fsmount, etc (see
below) to get rebuilt, but this specific change doesn't make 'perf
trace' be capable of decoding anything new, as we still don't decode
what comes from ioctls, just its cmds.

Details about the update:

  $ cp include/uapi/linux/fs.h tools/include/uapi/linux/fs.h
  $ git diff
  diff --git a/tools/include/uapi/linux/fs.h b/tools/include/uapi/linux/fs.h
  index 379a612f8f1d..f44eb0a04afd 100644
  --- a/tools/include/uapi/linux/fs.h
  +++ b/tools/include/uapi/linux/fs.h
  @@ -262,6 +262,7 @@ struct fsxattr {
   #define FS_EA_INODE_FL                 0x00200000 /* Inode used for large EA */
   #define FS_EOFBLOCKS_FL                        0x00400000 /* Reserved for ext4 */
   #define FS_NOCOW_FL                    0x00800000 /* Do not cow file */
  +#define FS_DAX_FL                      0x02000000 /* Inode is DAX */
   #define FS_INLINE_DATA_FL              0x10000000 /* Reserved for ext4 */
   #define FS_PROJINHERIT_FL              0x20000000 /* Create with parents projid */
   #define FS_CASEFOLD_FL                 0x40000000 /* Folder is case insensitive */
  $ m
  make: Entering directory '/home/acme/git/perf/tools/perf'
    BUILD:   Doing 'make -j8' parallel build
    INSTALL  GTK UI
    CC       /tmp/build/perf/builtin-trace.o
    DESCEND  plugins
    CC       /tmp/build/perf/trace/beauty/fsmount.o
    CC       /tmp/build/perf/trace/beauty/fspick.o
    CC       /tmp/build/perf/trace/beauty/mount_flags.o
    CC       /tmp/build/perf/trace/beauty/move_mount.o
    CC       /tmp/build/perf/trace/beauty/renameat.o
    CC       /tmp/build/perf/trace/beauty/sync_file_range.o
    INSTALL  trace_plugins
    LD       /tmp/build/perf/trace/beauty/perf-in.o
    LD       /tmp/build/perf/perf-in.o
    LINK     /tmp/build/perf/perf
  <SNIP>

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools include UAPI: Sync linux/vhost.h with the kernel sources
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 13:16:53 +0000 (10:16 -0300)]
tools include UAPI: Sync linux/vhost.h with the kernel sources

To get the changes in:

  776f395004d8 ("vhost_vdpa: Support config interrupt in vdpa")

Silencing this perf build warning:

  Warning: Kernel ABI header at 'tools/include/uapi/linux/vhost.h' differs from latest version at 'include/uapi/linux/vhost.h'
  diff -u tools/include/uapi/linux/vhost.h include/uapi/linux/vhost.h

This automatically picks the new ioctl introduced in the above patch,
making tools such as 'perf trace' aware of them and possibly allowing to
use the strings in filters, etc:

  # perf trace -e ioctl --pid 7951
  <SNIP>
     0.178 ( 0.010 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
     0.194 ( 0.010 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
     0.209 ( 0.010 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
     0.224 (249.413 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.660 ( 0.011 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.675 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.686 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.697 ( 0.008 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.709 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.720 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.730 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.740 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.752 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.762 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.772 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.782 (120.138 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   370.201 ( 0.039 ms): CPU 0/KVM/8023 ioctl(fd: 12, cmd: KVM_IRQ_LINE_STATUS, arg: 0x7f744f9e1420) = 0
   370.254 ( 0.052 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   370.575 ( 0.365 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   370.973 ( 0.028 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   371.015 ( 0.037 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   371.071 ( 0.009 ms): CPU 0/KVM/8023 ioctl(fd: 12, cmd: KVM_IRQ_LINE_STATUS, arg: 0x7f744f9e14b0) = 0
  <SNIP>
  #

Details about the update:

  $ diff -u tools/include/uapi/linux/vhost.h include/uapi/linux/vhost.h
  --- tools/include/uapi/linux/vhost.h 2020-04-16 13:19:12.056763843 -0300
  +++ include/uapi/linux/vhost.h 2020-06-17 10:04:20.532056428 -0300
  @@ -15,6 +15,8 @@
   #include <linux/types.h>
   #include <linux/ioctl.h>

  +#define VHOST_FILE_UNBIND -1
  +
   /* ioctls */

   #define VHOST_VIRTIO 0xAF
  @@ -140,4 +142,6 @@
   /* Get the max ring size. */
   #define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16)

  +/* Set event fd for config interrupt*/
  +#define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int)
   #endif
  $
  $ tools/perf/trace/beauty/vhost_virtio_ioctl.sh > before
  $ cp include/uapi/linux/vhost.h tools/include/uapi/linux/vhost.h
  $ tools/perf/trace/beauty/vhost_virtio_ioctl.sh > after
  $ diff -u before after
  --- before 2020-06-17 10:15:35.123275966 -0300
  +++ after 2020-06-17 10:15:51.812482117 -0300
  @@ -27,6 +27,7 @@
    [0x72] = "VDPA_SET_STATUS",
    [0x74] = "VDPA_SET_CONFIG",
    [0x75] = "VDPA_SET_VRING_ENABLE",
  + [0x77] = "VDPA_SET_CONFIG_CALL",
   };
   static const char *vhost_virtio_ioctl_read_cmds[] = {
    [0x00] = "GET_FEATURES",
  $

This causes these parts to get rebuilt:

  CC       /tmp/build/perf/trace/beauty/ioctl.o
  INSTALL  trace_plugins
  LD       /tmp/build/perf/trace/beauty/perf-in.o
  LD       /tmp/build/perf/perf-in.o
  LINK     /tmp/build/perf/perf

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zhu Lingshan <lingshan.zhu@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools arch x86: Sync the msr-index.h copy with the kernel sources
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 13:07:59 +0000 (10:07 -0300)]
tools arch x86: Sync the msr-index.h copy with the kernel sources

To pick up the changes in:

  7e5b3c267d25 ("x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation")

Addressing these tools/perf build warnings:

  Warning: Kernel ABI header at 'tools/arch/x86/include/asm/msr-index.h' differs from latest version at 'arch/x86/include/asm/msr-index.h'
  diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
  Warning: Kernel ABI header at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h'
  diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h

With this one will be able to use these new AMD MSRs in filters, by
name, e.g.:

  # perf trace -e msr:* --filter "msr==IA32_MCU_OPT_CTRL"
  ^C#

Using -v we can see how it sets up the tracepoint filters, converting
from the string in the filter to the numeric value:

  # perf trace -v -e msr:* --filter "msr==IA32_MCU_OPT_CTRL"
  Using CPUID GenuineIntel-6-8E-A
  0x123
  New filter for msr:read_msr: (msr==0x123) && (common_pid != 335 && common_pid != 30344)
  0x123
  New filter for msr:write_msr: (msr==0x123) && (common_pid != 335 && common_pid != 30344)
  0x123
  New filter for msr:rdpmc: (msr==0x123) && (common_pid != 335 && common_pid != 30344)
  mmap size 528384B
  ^C#

The updating process shows how this affects tooling in more detail:

  $ diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
  --- tools/arch/x86/include/asm/msr-index.h 2020-06-03 10:36:09.959910238 -0300
  +++ arch/x86/include/asm/msr-index.h 2020-06-17 10:04:20.235052901 -0300
  @@ -128,6 +128,10 @@
   #define TSX_CTRL_RTM_DISABLE BIT(0) /* Disable RTM feature */
   #define TSX_CTRL_CPUID_CLEAR BIT(1) /* Disable TSX enumeration */

  +/* SRBDS support */
  +#define MSR_IA32_MCU_OPT_CTRL 0x00000123
  +#define RNGDS_MITG_DIS BIT(0)
  +
   #define MSR_IA32_SYSENTER_CS 0x00000174
   #define MSR_IA32_SYSENTER_ESP 0x00000175
   #define MSR_IA32_SYSENTER_EIP 0x00000176
  $ set -o vi
  $ tools/perf/trace/beauty/tracepoints/x86_msr.sh > before
  $ cp arch/x86/include/asm/msr-index.h tools/arch/x86/include/asm/msr-index.h
  $ tools/perf/trace/beauty/tracepoints/x86_msr.sh > after
  $ diff -u before after
  --- before 2020-06-17 10:05:49.653114752 -0300
  +++ after 2020-06-17 10:06:01.777258731 -0300
  @@ -51,6 +51,7 @@
    [0x0000011e] = "IA32_BBL_CR_CTL3",
    [0x00000120] = "IDT_MCR_CTRL",
    [0x00000122] = "IA32_TSX_CTRL",
  + [0x00000123] = "IA32_MCU_OPT_CTRL",
    [0x00000140] = "MISC_FEATURES_ENABLES",
    [0x00000174] = "IA32_SYSENTER_CS",
    [0x00000175] = "IA32_SYSENTER_ESP",
  $

The related change to cpu-features.h affects this:

  CC       /tmp/build/perf/bench/mem-memcpy-x86-64-asm.o
  CC       /tmp/build/perf/bench/mem-memset-x86-64-asm.o

This shouldn't be affecting that 'perf bench' entry:

  $ find tools/perf/ -type f | xargs grep SRBDS
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Gross <mgross@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoMerge remote-tracking branch 'torvalds/master' into perf/urgent
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 16:20:14 +0000 (13:20 -0300)]
Merge remote-tracking branch 'torvalds/master' into perf/urgent

To get some newer headers that got out of sync with the copies in tools/
so that we can try to have the tools/perf/ build clean for v5.8 with
fewer pull requests.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoperf script: Initialize zstd_data
Milian Wolff [Fri, 12 Jun 2020 23:03:33 +0000 (01:03 +0200)]
perf script: Initialize zstd_data

Fixes segmentation fault when trying to interpret zstd-compressed data
with perf script:

```
  $ perf record -z ls
  ...
  [ perf record: Captured and wrote 0,010 MB perf.data, compressed (original 0,001 MB, ratio is 2,190) ]
  $ memcheck perf script
  ...
  ==67911== Invalid read of size 4
  ==67911==    at 0x5568188: ZSTD_decompressStream (in /usr/lib/libzstd.so.1.4.5)
  ==67911==    by 0x6E726B: zstd_decompress_stream (zstd.c:100)
  ==67911==    by 0x65729C: perf_session__process_compressed_event (session.c:72)
  ==67911==    by 0x6598E8: perf_session__process_user_event (session.c:1583)
  ==67911==    by 0x65BA59: reader__process_events (session.c:2177)
  ==67911==    by 0x65BA59: __perf_session__process_events (session.c:2234)
  ==67911==    by 0x65BA59: perf_session__process_events (session.c:2267)
  ==67911==    by 0x5A7397: __cmd_script (builtin-script.c:2447)
  ==67911==    by 0x5A7397: cmd_script (builtin-script.c:3840)
  ==67911==    by 0x5FE9D2: run_builtin (perf.c:312)
  ==67911==    by 0x711627: handle_internal_command (perf.c:364)
  ==67911==    by 0x711627: run_argv (perf.c:408)
  ==67911==    by 0x711627: main (perf.c:538)
  ==67911==  Address 0x71d8 is not stack'd, malloc'd or (recently) free'd
```

Signed-off-by: Milian Wolff <milian.wolff@kdab.com>
Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
LPU-Reference: 20200612230333.72140-1-milian.wolff@kdab.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoregmap: Fix memory leak from regmap_register_patch
Charles Keepax [Wed, 17 Jun 2020 15:21:29 +0000 (16:21 +0100)]
regmap: Fix memory leak from regmap_register_patch

When a register patch is registered the reg_sequence is copied but the
memory allocated is never freed. Add a kfree in regmap_exit to clean it
up.

Fixes: 22f0d90a3482 ("regmap: Support register patch sets")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20200617152129.19655-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoALSA: hda/realtek: Add mute LED and micmute LED support for HP systems
Kai-Heng Feng [Wed, 17 Jun 2020 10:29:02 +0000 (18:29 +0800)]
ALSA: hda/realtek: Add mute LED and micmute LED support for HP systems

There are two more HP systems control mute LED from HDA codec and need
to expose micmute led class so SoF can control micmute LED.

Add quirks to support them.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200617102906.16156-2-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agoblktrace: Avoid sparse warnings when assigning q->blk_trace
Jan Kara [Fri, 5 Jun 2020 14:58:37 +0000 (16:58 +0200)]
blktrace: Avoid sparse warnings when assigning q->blk_trace

Mostly for historical reasons, q->blk_trace is assigned through xchg()
and cmpxchg() atomic operations. Although this is correct, sparse
complains about this because it violates rcu annotations since commit
c780e86dd48e ("blktrace: Protect q->blk_trace with RCU") which started
to use rcu for accessing q->blk_trace. Furthermore there's no real need
for atomic operations anymore since all changes to q->blk_trace happen
under q->blk_trace_mutex and since it also makes more sense to check if
q->blk_trace is set with the mutex held earlier.

So let's just replace xchg() with rcu_replace_pointer() and cmpxchg()
with explicit check and rcu_assign_pointer(). This makes the code more
efficient and sparse happy.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoblktrace: break out of blktrace setup on concurrent calls
Luis Chamberlain [Fri, 5 Jun 2020 14:58:36 +0000 (16:58 +0200)]
blktrace: break out of blktrace setup on concurrent calls

We use one blktrace per request_queue, that means one per the entire
disk.  So we cannot run one blktrace on say /dev/vda and then /dev/vda1,
or just two calls on /dev/vda.

We check for concurrent setup only at the very end of the blktrace setup though.

If we try to run two concurrent blktraces on the same block device the
second one will fail, and the first one seems to go on. However when
one tries to kill the first one one will see things like this:

The kernel will show these:

```
debugfs: File 'dropped' in directory 'nvme1n1' already present!
debugfs: File 'msg' in directory 'nvme1n1' already present!
debugfs: File 'trace0' in directory 'nvme1n1' already present!
``

And userspace just sees this error message for the second call:

```
blktrace /dev/nvme1n1
BLKTRACESETUP(2) /dev/nvme1n1 failed: 5/Input/output error
```

The first userspace process #1 will also claim that the files
were taken underneath their nose as well. The files are taken
away form the first process given that when the second blktrace
fails, it will follow up with a BLKTRACESTOP and BLKTRACETEARDOWN.
This means that even if go-happy process #1 is waiting for blktrace
data, we *have* been asked to take teardown the blktrace.

This can easily be reproduced with break-blktrace [0] run_0005.sh test.

Just break out early if we know we're already going to fail, this will
prevent trying to create the files all over again, which we know still
exist.

[0] https://github.com/mcgrof/break-blktrace

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agopowerpc/syscalls: Use the number when building SPU syscall table
Michael Ellerman [Tue, 16 Jun 2020 13:56:16 +0000 (23:56 +1000)]
powerpc/syscalls: Use the number when building SPU syscall table

Currently the macro that inserts entries into the SPU syscall table
doesn't actually use the "nr" (syscall number) parameter.

This does work, but it relies on the exact right number of syscall
entries being emitted in order for the syscal numbers to line up with
the array entries. If for example we had two entries with the same
syscall number we wouldn't get an error, it would just cause all
subsequent syscalls to be off by one in the spu_syscall_table.

So instead change the macro to assign to the specific entry of the
array, meaning any numbering overlap will be caught by the compiler.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200616135617.2937252-1-mpe@ellerman.id.au
4 years agopowerpc/8xx: use pmd_off() to access a PMD entry in pte_update()
Mike Rapoport [Mon, 15 Jun 2020 09:22:29 +0000 (12:22 +0300)]
powerpc/8xx: use pmd_off() to access a PMD entry in pte_update()

The pte_update() implementation for PPC_8xx unfolds page table from the PGD
level to access a PMD entry. Since 8xx has only 2-level page table this can
be simplified with pmd_off() shortcut.

Replace explicit unfolding with pmd_off() and drop defines of pgd_index()
and pgd_offset() that are no longer needed.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200615092229.23142-1-rppt@kernel.org
4 years agospi: stm32-qspi: Fix error path in case of -EPROBE_DEFER
Patrice Chotard [Tue, 16 Jun 2020 11:30:35 +0000 (13:30 +0200)]
spi: stm32-qspi: Fix error path in case of -EPROBE_DEFER

In case of -EPROBE_DEFER, stm32_qspi_release() was called
in any case which unregistered driver from pm_runtime framework
even if it has not been registered yet to it. This leads to:

stm32-qspi 58003000.spi: can't setup spi0.0, status -13
spi_master spi0: spi_device register error /soc/spi@58003000/mx66l51235l@0
spi_master spi0: Failed to create SPI device for /soc/spi@58003000/mx66l51235l@0
stm32-qspi 58003000.spi: can't setup spi0.1, status -13
spi_master spi0: spi_device register error /soc/spi@58003000/mx66l51235l@1
spi_master spi0: Failed to create SPI device for /soc/spi@58003000/mx66l51235l@1

On v5.7 kernel,this issue was not "visible", qspi driver was probed
successfully.

Fixes: 9d282c17b023 ("spi: stm32-qspi: Add pm_runtime support")

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Link: https://lore.kernel.org/r/20200616113035.4514-1-patrice.chotard@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoregulator: mt6358: Remove BROKEN dependency
Axel Lin [Tue, 16 Jun 2020 13:50:30 +0000 (21:50 +0800)]
regulator: mt6358: Remove BROKEN dependency

The MFD part is merged into v5.8-rc1, thus remove BROKEN dependency.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20200616135030.1163660-1-axel.lin@ingics.com
Signed-off-by: Mark Brown <broonie@kernel.org>
4 years agoMerge tag 'v5.8-rc1' into regulator-5.8
Mark Brown [Wed, 17 Jun 2020 11:39:12 +0000 (12:39 +0100)]
Merge tag 'v5.8-rc1' into regulator-5.8

Linux 5.8-rc1

4 years agoarm64: bti: Require clang >= 10.0.1 for in-kernel BTI support
Will Deacon [Tue, 16 Jun 2020 18:03:49 +0000 (19:03 +0100)]
arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support

Unfortunately, most versions of clang that support BTI are capable of
miscompiling the kernel when converting a switch statement into a jump
table. As an example, attempting to spawn a KVM guest results in a panic:

[   56.253312] Kernel panic - not syncing: bad mode
[   56.253834] CPU: 0 PID: 279 Comm: lkvm Not tainted 5.8.0-rc1 #2
[   56.254225] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
[   56.254712] Call trace:
[   56.254952]  dump_backtrace+0x0/0x1d4
[   56.255305]  show_stack+0x1c/0x28
[   56.255647]  dump_stack+0xc4/0x128
[   56.255905]  panic+0x16c/0x35c
[   56.256146]  bad_el0_sync+0x0/0x58
[   56.256403]  el1_sync_handler+0xb4/0xe0
[   56.256674]  el1_sync+0x7c/0x100
[   56.256928]  kvm_vm_ioctl_check_extension_generic+0x74/0x98
[   56.257286]  __arm64_sys_ioctl+0x94/0xcc
[   56.257569]  el0_svc_common+0x9c/0x150
[   56.257836]  do_el0_svc+0x84/0x90
[   56.258083]  el0_sync_handler+0xf8/0x298
[   56.258361]  el0_sync+0x158/0x180

This is because the switch in kvm_vm_ioctl_check_extension_generic()
is executed as an indirect branch to tail-call through a jump table:

ffff800010032dc8:       3869694c        ldrb    w12, [x10, x9]
ffff800010032dcc:       8b0c096b        add     x11, x11, x12, lsl #2
ffff800010032dd0:       d61f0160        br      x11

However, where the target case uses the stack, the landing pad is elided
due to the presence of a paciasp instruction:

ffff800010032e14:       d503233f        paciasp
ffff800010032e18:       a9bf7bfd        stp     x29, x30, [sp, #-16]!
ffff800010032e1c:       910003fd        mov     x29, sp
ffff800010032e20:       aa0803e0        mov     x0, x8
ffff800010032e24:       940017c0        bl      ffff800010038d24 <kvm_vm_ioctl_check_extension>
ffff800010032e28:       93407c00        sxtw    x0, w0
ffff800010032e2c:       a8c17bfd        ldp     x29, x30, [sp], #16
ffff800010032e30:       d50323bf        autiasp
ffff800010032e34:       d65f03c0        ret

Unfortunately, this results in a fatal exception because paciasp is
compatible only with branch-and-link (call) instructions and not simple
indirect branches.

A fix is being merged into Clang 10.0.1 so that a 'bti j' instruction is
emitted as an explicit landing pad in this situation. Make in-kernel
BTI depend on that compiler version when building with clang.

Cc: Tom Stellard <tstellar@redhat.com>
Cc: Daniel Kiss <daniel.kiss@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20200615105524.GA2694@willie-the-truck
Link: https://lore.kernel.org/r/20200616183630.2445-1-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoALSA: usb-audio: Fix potential use-after-free of streams
Takashi Iwai [Tue, 16 Jun 2020 12:09:21 +0000 (14:09 +0200)]
ALSA: usb-audio: Fix potential use-after-free of streams

With the recent full-duplex support of implicit feedback streams, an
endpoint can be still running after closing the capture stream as long
as the playback stream with the sync-endpoint is running.  In such a
state, the URBs are still be handled and they may call retire_data_urb
callback, which tries to transfer the data from the PCM buffer.  Since
the PCM stream gets closed, this may lead to use-after-free.

This patch adds the proper clearance of the callback at stopping the
capture stream for addressing the possible UAF above.

Fixes: 10ce77e4817f ("ALSA: usb-audio: Add duplex sound support for USB devices using implicit feedback")
Link: https://lore.kernel.org/r/20200616120921.12249-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
4 years agooverflow.h: Add flex_array_size() helper
Gustavo A. R. Silva [Tue, 9 Jun 2020 01:22:33 +0000 (20:22 -0500)]
overflow.h: Add flex_array_size() helper

Add flex_array_size() helper for the calculation of the size, in bytes,
of a flexible array member contained within an enclosing structure.

Example of usage:

struct something {
size_t count;
struct foo items[];
};

struct something *instance;

instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
instance->count = count;
memcpy(instance->items, src, flex_array_size(instance, items, instance->count));

The helper returns SIZE_MAX on overflow instead of wrapping around.

Additionally replaces parameter "n" with "count" in struct_size() helper
for greater clarity and unification.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200609012233.GA3371@embeddedor
Signed-off-by: Kees Cook <keescook@chromium.org>
4 years agoscripts: Fix typo in headers_install.sh
Masanari Iida [Tue, 16 Jun 2020 12:51:32 +0000 (21:51 +0900)]
scripts: Fix typo in headers_install.sh

This patch fixes a spelling typo in scripts/headers_install.sh

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
4 years agokconfig: unify cc-option and as-option
Masahiro Yamada [Sun, 14 Jun 2020 14:43:41 +0000 (23:43 +0900)]
kconfig: unify cc-option and as-option

cc-option and as-option are almost the same; both pass the flag to
$(CC). The main difference is the cc-option stops before the assemble
stage (-S option) whereas as-option stops after (-c option).

I chose -S because it is slightly faster, but $(cc-option,-gz=zlib)
returns a wrong result (https://lkml.org/lkml/2020/6/9/1529).
It has been fixed by commit 7b16994437c7 ("Makefile: Improve compressed
debug info support detection"), but the assembler should always be
invoked for more reliable compiler option tests.

However, you cannot simply replace -S with -c because the following
code in lib/Kconfig.debug would break:

    depends on $(cc-option,-gsplit-dwarf)

The combination of -c and -gsplit-dwarf does not accept /dev/null as
output.

  $ cat /dev/null | gcc -gsplit-dwarf -S -x c - -o /dev/null
  $ echo $?
  0

  $ cat /dev/null | gcc -gsplit-dwarf -c -x c - -o /dev/null
  objcopy: Warning: '/dev/null' is not an ordinary file
  $ echo $?
  1

  $ cat /dev/null | gcc -gsplit-dwarf -c -x c - -o tmp.o
  $ echo $?
  0

There is another flag that creates an separate file based on the
object file path:

  $ cat /dev/null | gcc -ftest-coverage -c -x c - -o /dev/null
  <stdin>:1: error: cannot open /dev/null.gcno

So, we cannot use /dev/null to sink the output.

Align the cc-option implementation with scripts/Kbuild.include.

With -c option used in cc-option, as-option is unneeded.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
4 years agotools/bootconfig: Add testcase for show-command and quotes test
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:34 +0000 (19:14 +0900)]
tools/bootconfig: Add testcase for show-command and quotes test

Add testcases for the return value of the command to show
bootconfig in initrd, and double/single quotes selecting.

Link: http://lkml.kernel.org/r/159230247428.65555.2109472942519215104.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools/bootconfig: Fix to return 0 if succeeded to show the bootconfig
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:25 +0000 (19:14 +0900)]
tools/bootconfig: Fix to return 0 if succeeded to show the bootconfig

Fix bootconfig to return 0 if succeeded to show the bootconfig
in initrd. Without this fix, "bootconfig INITRD" command
returns !0 even if the command succeeded to show the bootconfig.

Link: http://lkml.kernel.org/r/159230246566.65555.11891772258543514487.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 950313ebf79c ("tools: bootconfig: Add bootconfig command")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools/bootconfig: Fix to use correct quotes for value
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:17 +0000 (19:14 +0900)]
tools/bootconfig: Fix to use correct quotes for value

Fix bootconfig tool to select double or single quotes
correctly according to the value.

If a bootconfig value includes a double quote character,
we must use single-quotes to quote that value.

Link: http://lkml.kernel.org/r/159230245697.65555.12444299015852932304.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 950313ebf79c ("tools: bootconfig: Add bootconfig command")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoproc/bootconfig: Fix to use correct quotes for value
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:08 +0000 (19:14 +0900)]
proc/bootconfig: Fix to use correct quotes for value

Fix /proc/bootconfig to select double or single quotes
corrctly according to the value.

If a bootconfig value includes a double quote character,
we must use single-quotes to quote that value.

This modifies if() condition and blocks for avoiding
double-quote in value check in 2 places. Anyway, since
xbc_array_for_each_value() can handle the array which
has a single node correctly.
Thus,

if (vnode && xbc_node_is_array(vnode)) {
xbc_array_for_each_value(vnode) /* vnode->next != NULL */
...
} else {
snprintf(val); /* val is an empty string if !vnode */
}

is equivalent to

if (vnode) {
xbc_array_for_each_value(vnode) /* vnode->next can be NULL */
...
} else {
snprintf(""); /* value is always empty */
}

Link: http://lkml.kernel.org/r/159230244786.65555.3763894451251622488.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: c1a3c36017d4 ("proc: bootconfig: Add /proc/bootconfig to show boot config list")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Remove unused event variable in tracing_iter_reset
YangHui [Tue, 16 Jun 2020 03:36:46 +0000 (11:36 +0800)]
tracing: Remove unused event variable in tracing_iter_reset

We do not use the event variable, just remove it.

Signed-off-by: YangHui <yanghui.def@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/probe: Fix memleak in fetch_op_data operations
Vamshi K Sthambamkadi [Mon, 15 Jun 2020 14:30:38 +0000 (20:00 +0530)]
tracing/probe: Fix memleak in fetch_op_data operations

kmemleak report:
    [<57dcc2ca>] __kmalloc_track_caller+0x139/0x2b0
    [<f1c45d0f>] kstrndup+0x37/0x80
    [<f9761eb0>] parse_probe_arg.isra.7+0x3cc/0x630
    [<055bf2ba>] traceprobe_parse_probe_arg+0x2f5/0x810
    [<655a7766>] trace_kprobe_create+0x2ca/0x950
    [<4fc6a02a>] create_or_delete_trace_kprobe+0xf/0x30
    [<6d1c8a52>] trace_run_command+0x67/0x80
    [<be812cc0>] trace_parse_run_command+0xa7/0x140
    [<aecfe401>] probes_write+0x10/0x20
    [<2027641c>] __vfs_write+0x30/0x1e0
    [<6a4aeee1>] vfs_write+0x96/0x1b0
    [<3517fb7d>] ksys_write+0x53/0xc0
    [<dad91db7>] __ia32_sys_write+0x15/0x20
    [<da347f64>] do_syscall_32_irqs_on+0x3d/0x260
    [<fd0b7e7d>] do_fast_syscall_32+0x39/0xb0
    [<ea5ae810>] entry_SYSENTER_32+0xaf/0x102

Post parse_probe_arg(), the FETCH_OP_DATA operation type is overwritten
to FETCH_OP_ST_STRING, as a result memory is never freed since
traceprobe_free_probe_arg() iterates only over SYMBOL and DATA op types

Setup fetch string operation correctly after fetch_op_data operation.

Link: https://lkml.kernel.org/r/20200615143034.GA1734@cosmos
Cc: stable@vger.kernel.org
Fixes: a42e3c4de964 ("tracing/probe: Add immediate string parameter support")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotrace: Fix typo in allocate_ftrace_ops()'s comment
Wei Yang [Wed, 10 Jun 2020 03:32:51 +0000 (11:32 +0800)]
trace: Fix typo in allocate_ftrace_ops()'s comment

No functional change, just correct the word.

Link: https://lkml.kernel.org/r/20200610033251.31713-1-richard.weiyang@linux.alibaba.com
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Make ftrace packed events have align of 1
Steven Rostedt (VMware) [Wed, 10 Jun 2020 02:00:41 +0000 (22:00 -0400)]
tracing: Make ftrace packed events have align of 1

When using trace-cmd on 5.6-rt for the function graph tracer, the output was
corrupted. It gave output like this:

 funcgraph_entry:       func=0xffffffff depth=38982
 funcgraph_entry:       func=0x1ffffffff depth=16044
 funcgraph_exit:        func=0xffffffff overrun=0x92539aaf00000000 calltime=0x92539c9900000072 rettime=0x100000072 depth=11084
 funcgraph_exit:        func=0xffffffff overrun=0x9253946e00000000 calltime=0x92539e2100000072 rettime=0x72 depth=26033702
 funcgraph_entry:       func=0xffffffff depth=85798
 funcgraph_entry:       func=0x1ffffffff depth=12044

The reason was because the tracefs/events/ftrace/funcgraph_entry/exit format
file was incorrect. The -rt kernel adds more common fields to the trace
events. Namely, common_migrate_disable and common_preempt_lazy_count. Each
is one byte in size. This changes the alignment of the normal payload. Most
events are aligned normally, but the function and function graph events are
defined with a "PACKED" macro, that packs their payload. As the offsets
displayed in the format files are now calculated by an aligned field, the
aligned field for function and function graph events should be 1, not their
normal alignment.

With aligning of the funcgraph_entry event, the format file has:

        field:unsigned short common_type;       offset:0;       size:2; signed:0;
        field:unsigned char common_flags;       offset:2;       size:1; signed:0;
        field:unsigned char common_preempt_count;       offset:3;       size:1; signed:0;
        field:int common_pid;   offset:4;       size:4; signed:1;
        field:unsigned char common_migrate_disable;     offset:8;       size:1; signed:0;
        field:unsigned char common_preempt_lazy_count;  offset:9;       size:1; signed:0;

        field:unsigned long func;       offset:16;      size:8; signed:0;
        field:int depth;        offset:24;      size:4; signed:1;

But the actual alignment is:

field:unsigned short common_type; offset:0; size:2; signed:0;
field:unsigned char common_flags; offset:2; size:1; signed:0;
field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;
field:unsigned char common_migrate_disable; offset:8; size:1; signed:0;
field:unsigned char common_preempt_lazy_count; offset:9; size:1; signed:0;

field:unsigned long func; offset:12; size:8; signed:0;
field:int depth; offset:20; size:4; signed:1;

Link: https://lkml.kernel.org/r/20200609220041.2a3b527f@oasis.local.home
Cc: stable@vger.kernel.org
Fixes: 04ae87a52074e ("ftrace: Rework event_create_dir()")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agosample-trace-array: Remove trace_array 'sample-instance'
Kefeng Wang [Tue, 9 Jun 2020 13:52:00 +0000 (13:52 +0000)]
sample-trace-array: Remove trace_array 'sample-instance'

Remove trace_array 'sample-instance' if kthread_run fails
in sample_trace_array_init().

Link: https://lkml.kernel.org/r/20200609135200.2206726-1-wangkefeng.wang@huawei.com
Cc: stable@vger.kernel.org
Fixes: 89ed42495ef4a ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <divya.indi@oracle.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agosample-trace-array: Fix sleeping function called from invalid context
Kefeng Wang [Wed, 10 Jun 2020 01:12:44 +0000 (01:12 +0000)]
sample-trace-array: Fix sleeping function called from invalid context

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:935
 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/5
 1 lock held by swapper/5/0:
  #0: ffff80001002bd90 (samples/ftrace/sample-trace-array.c:38){+.-.}-{0:0}, at: call_timer_fn+0x8/0x3e0
 CPU: 5 PID: 0 Comm: swapper/5 Not tainted 5.7.0+ #8
 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
 Call trace:
  dump_backtrace+0x0/0x1a0
  show_stack+0x20/0x30
  dump_stack+0xe4/0x150
  ___might_sleep+0x160/0x200
  __might_sleep+0x58/0x90
  __mutex_lock+0x64/0x948
  mutex_lock_nested+0x3c/0x58
  __ftrace_set_clr_event+0x44/0x88
  trace_array_set_clr_event+0x24/0x38
  mytimer_handler+0x34/0x40 [sample_trace_array]

mutex_lock() will be called in interrupt context, using workqueue to fix it.

Link: https://lkml.kernel.org/r/20200610011244.2209486-1-wangkefeng.wang@huawei.com
Cc: stable@vger.kernel.org
Fixes: 89ed42495ef4 ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <divya.indi@oracle.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokretprobe: Prevent triggering kretprobe from within kprobe_flush_task
Jiri Olsa [Tue, 12 May 2020 08:03:18 +0000 (17:03 +0900)]
kretprobe: Prevent triggering kretprobe from within kprobe_flush_task

Ziqian reported lockup when adding retprobe on _raw_spin_lock_irqsave.
My test was also able to trigger lockdep output:

 ============================================
 WARNING: possible recursive locking detected
 5.6.0-rc6+ #6 Not tainted
 --------------------------------------------
 sched-messaging/2767 is trying to acquire lock:
 ffffffff9a492798 (&(kretprobe_table_locks[i].lock)){-.-.}, at: kretprobe_hash_lock+0x52/0xa0

 but task is already holding lock:
 ffffffff9a491a18 (&(kretprobe_table_locks[i].lock)){-.-.}, at: kretprobe_trampoline+0x0/0x50

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock(&(kretprobe_table_locks[i].lock));
   lock(&(kretprobe_table_locks[i].lock));

  *** DEADLOCK ***

  May be due to missing lock nesting notation

 1 lock held by sched-messaging/2767:
  #0: ffffffff9a491a18 (&(kretprobe_table_locks[i].lock)){-.-.}, at: kretprobe_trampoline+0x0/0x50

 stack backtrace:
 CPU: 3 PID: 2767 Comm: sched-messaging Not tainted 5.6.0-rc6+ #6
 Call Trace:
  dump_stack+0x96/0xe0
  __lock_acquire.cold.57+0x173/0x2b7
  ? native_queued_spin_lock_slowpath+0x42b/0x9e0
  ? lockdep_hardirqs_on+0x590/0x590
  ? __lock_acquire+0xf63/0x4030
  lock_acquire+0x15a/0x3d0
  ? kretprobe_hash_lock+0x52/0xa0
  _raw_spin_lock_irqsave+0x36/0x70
  ? kretprobe_hash_lock+0x52/0xa0
  kretprobe_hash_lock+0x52/0xa0
  trampoline_handler+0xf8/0x940
  ? kprobe_fault_handler+0x380/0x380
  ? find_held_lock+0x3a/0x1c0
  kretprobe_trampoline+0x25/0x50
  ? lock_acquired+0x392/0xbc0
  ? _raw_spin_lock_irqsave+0x50/0x70
  ? __get_valid_kprobe+0x1f0/0x1f0
  ? _raw_spin_unlock_irqrestore+0x3b/0x40
  ? finish_task_switch+0x4b9/0x6d0
  ? __switch_to_asm+0x34/0x70
  ? __switch_to_asm+0x40/0x70

The code within the kretprobe handler checks for probe reentrancy,
so we won't trigger any _raw_spin_lock_irqsave probe in there.

The problem is in outside kprobe_flush_task, where we call:

  kprobe_flush_task
    kretprobe_table_lock
      raw_spin_lock_irqsave
        _raw_spin_lock_irqsave

where _raw_spin_lock_irqsave triggers the kretprobe and installs
kretprobe_trampoline handler on _raw_spin_lock_irqsave return.

The kretprobe_trampoline handler is then executed with already
locked kretprobe_table_locks, and first thing it does is to
lock kretprobe_table_locks ;-) the whole lockup path like:

  kprobe_flush_task
    kretprobe_table_lock
      raw_spin_lock_irqsave
        _raw_spin_lock_irqsave ---> probe triggered, kretprobe_trampoline installed

        ---> kretprobe_table_locks locked

        kretprobe_trampoline
          trampoline_handler
            kretprobe_hash_lock(current, &head, &flags);  <--- deadlock

Adding kprobe_busy_begin/end helpers that mark code with fake
probe installed to prevent triggering of another kprobe within
this code.

Using these helpers in kprobe_flush_task, so the probe recursion
protection check is hit and the probe is never set to prevent
above lockup.

Link: http://lkml.kernel.org/r/158927059835.27680.7011202830041561604.stgit@devnote2
Fixes: ef53d9c5e4da ("kprobes: improve kretprobe scalability with hashed locking")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "Gustavo A . R . Silva" <gustavoars@kernel.org>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: "Naveen N . Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Reported-by: "Ziqian SUN (Zamir)" <zsun@redhat.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Remove redundant arch_disarm_kprobe() call
Masami Hiramatsu [Tue, 12 May 2020 08:03:07 +0000 (17:03 +0900)]
kprobes: Remove redundant arch_disarm_kprobe() call

Fix to remove redundant arch_disarm_kprobe() call in
force_unoptimize_kprobe(). This arch_disarm_kprobe()
will be invoked if the kprobe is optimized but disabled,
but that means the kprobe (optprobe) is unused (and
unoptimized) state.

In that case, unoptimize_kprobe() puts it in freeing_list
and kprobe_optimizer (do_unoptimize_kprobes()) automatically
disarm it. Thus this arch_disarm_kprobe() is redundant.

Link: http://lkml.kernel.org/r/158927058719.27680.17183632908465341189.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Fix to protect kick_kprobe_optimizer() by kprobe_mutex
Masami Hiramatsu [Tue, 12 May 2020 08:02:56 +0000 (17:02 +0900)]
kprobes: Fix to protect kick_kprobe_optimizer() by kprobe_mutex

In kprobe_optimizer() kick_kprobe_optimizer() is called
without kprobe_mutex, but this can race with other caller
which is protected by kprobe_mutex.

To fix that, expand kprobe_mutex protected area to protect
kick_kprobe_optimizer() call.

Link: http://lkml.kernel.org/r/158927057586.27680.5036330063955940456.stgit@devnote2
Fixes: cd7ebe2298ff ("kprobes: Use text_poke_smp_batch for optimizing")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "Gustavo A . R . Silva" <gustavoars@kernel.org>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: "Naveen N . Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ziqian SUN <zsun@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Use non RCU traversal APIs on kprobe_tables if possible
Masami Hiramatsu [Tue, 12 May 2020 08:02:44 +0000 (17:02 +0900)]
kprobes: Use non RCU traversal APIs on kprobe_tables if possible

Current kprobes uses RCU traversal APIs on kprobe_tables
even if it is safe because kprobe_mutex is locked.

Make those traversals to non-RCU APIs where the kprobe_mutex
is locked.

Link: http://lkml.kernel.org/r/158927056452.27680.9710575332163005121.stgit@devnote2
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Suppress the suspicious RCU warning on kprobes
Masami Hiramatsu [Tue, 12 May 2020 08:02:33 +0000 (17:02 +0900)]
kprobes: Suppress the suspicious RCU warning on kprobes

Anders reported that the lockdep warns that suspicious
RCU list usage in register_kprobe() (detected by
CONFIG_PROVE_RCU_LIST.) This is because get_kprobe()
access kprobe_table[] by hlist_for_each_entry_rcu()
without rcu_read_lock.

If we call get_kprobe() from the breakpoint handler context,
it is run with preempt disabled, so this is not a problem.
But in other cases, instead of rcu_read_lock(), we locks
kprobe_mutex so that the kprobe_table[] is not updated.
So, current code is safe, but still not good from the view
point of RCU.

Joel suggested that we can silent that warning by passing
lockdep_is_held() to the last argument of
hlist_for_each_entry_rcu().

Add lockdep_is_held(&kprobe_mutex) at the end of the
hlist_for_each_entry_rcu() to suppress the warning.

Link: http://lkml.kernel.org/r/158927055350.27680.10261450713467997503.stgit@devnote2
Reported-by: Anders Roxell <anders.roxell@linaro.org>
Suggested-by: Joel Fernandes <joel@joelfernandes.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agorecordmcount: support >64k sections
Sami Tolvanen [Fri, 24 Apr 2020 19:30:46 +0000 (12:30 -0700)]
recordmcount: support >64k sections

When compiling a kernel with Clang and LTO, we need to run
recordmcount on vmlinux.o with a large number of sections, which
currently fails as the program doesn't understand extended
section indexes. This change adds support for processing binaries
with >64k sections.

Link: https://lkml.kernel.org/r/20200424193046.160744-1-samitolvanen@google.com
Link: https://lore.kernel.org/lkml/CAK7LNARbZhoaA=Nnuw0=gBrkuKbr_4Ng_Ei57uafujZf7Xazgw@mail.gmail.com/
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Matt Helsley <mhelsley@vmware.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokbuild: improve cc-option to clean up all temporary files
Masahiro Yamada [Sun, 14 Jun 2020 14:43:40 +0000 (23:43 +0900)]
kbuild: improve cc-option to clean up all temporary files

When cc-option and friends evaluate compiler flags, the temporary file
$$TMP is created as an output object, and automatically cleaned up.
The actual file path of $$TMP is .<pid>.tmp, here <pid> is the process
ID of $(shell ...) invoked from cc-option. (Please note $$$$ is the
escape sequence of $$).

Such garbage files are cleaned up in most cases, but some compiler flags
create additional output files.

For example, -gsplit-dwarf creates a .dwo file.

When CONFIG_DEBUG_INFO_SPLIT=y, you will see a bunch of .<pid>.dwo files
left in the top of build directories. You may not notice them unless you
do 'ls -a', but the garbage files will increase every time you run 'make'.

This commit changes the temporary object path to .tmp_<pid>/tmp, and
removes .tmp_<pid> directory when exiting. Separate build artifacts such
as *.dwo will be cleaned up all together because their file paths are
usually determined based on the base name of the object.

Another example is -ftest-coverage, which outputs the coverage data into
<base-name-of-object>.gcno

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
4 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Linus Torvalds [Wed, 17 Jun 2020 00:44:54 +0000 (17:44 -0700)]
Merge git://git./linux/kernel/git/netdev/net

Pull networking fixes from David Miller:

 1) Don't get per-cpu pointer with preemption enabled in nft_set_pipapo,
    fix from Stefano Brivio.

 2) Fix memory leak in ctnetlink, from Pablo Neira Ayuso.

 3) Multiple definitions of MPTCP_PM_MAX_ADDR, from Geliang Tang.

 4) Accidently disabling NAPI in non-error paths of macb_open(), from
    Charles Keepax.

 5) Fix races between alx_stop and alx_remove, from Zekun Shen.

 6) We forget to re-enable SRIOV during resume in bnxt_en driver, from
    Michael Chan.

 7) Fix memory leak in ipv6_mc_destroy_dev(), from Wang Hai.

 8) rxtx stats use wrong index in mvpp2 driver, from Sven Auhagen.

 9) Fix memory leak in mptcp_subflow_create_socket error path, from Wei
    Yongjun.

10) We should not adjust the TCP window advertised when sending dup acks
    in non-SACK mode, because it won't be counted as a dup by the sender
    if the window size changes. From Eric Dumazet.

11) Destroy the right number of queues during remove in mvpp2 driver,
    from Sven Auhagen.

12) Various WOL and PM fixes to e1000 driver, from Chen Yu, Vaibhav
    Gupta, and Arnd Bergmann.

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (35 commits)
  e1000e: fix unused-function warning
  e1000: use generic power management
  e1000e: Do not wake up the system via WOL if device wakeup is disabled
  lan743x: add MODULE_DEVICE_TABLE for module loading alias
  mlxsw: spectrum: Adjust headroom buffers for 8x ports
  bareudp: Fixed configuration to avoid having garbage values
  mvpp2: remove module bugfix
  tcp: grow window for OOO packets only for SACK flows
  mptcp: fix memory leak in mptcp_subflow_create_socket()
  netfilter: flowtable: Make nf_flow_table_offload_add/del_cb inline
  net/sched: act_ct: Make tcf_ct_flow_table_restore_skb inline
  net: dsa: sja1105: fix PTP timestamping with large tc-taprio cycles
  mvpp2: ethtool rxtx stats fix
  MAINTAINERS: switch to my private email for Renesas Ethernet drivers
  rocker: fix incorrect error handling in dma_rings_init
  test_objagg: Fix potential memory leak in error handling
  net: ethernet: mtk-star-emac: simplify interrupt handling
  mld: fix memory leak in ipv6_mc_destroy_dev()
  bnxt_en: Return from timer if interface is not in open state.
  bnxt_en: Fix AER reset logic on 57500 chips.
  ...

4 years agoMerge tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
Linus Torvalds [Wed, 17 Jun 2020 00:40:51 +0000 (17:40 -0700)]
Merge tag 'afs-fixes-20200616' of git://git./linux/kernel/git/dhowells/linux-fs

Pull AFS fixes from David Howells:
 "I've managed to get xfstests kind of working with afs. Here are a set
  of patches that fix most of the bugs found.

  There are a number of primary issues:

   - Incorrect handling of mtime and non-handling of ctime. It might be
     argued, that the latter isn't a bug since the AFS protocol doesn't
     support ctime, but I should probably still update it locally.

   - Shared-write mmap, truncate and writeback bugs. This includes not
     changing i_size under the callback lock, overwriting local i_size
     with the reply from the server after a partial writeback, not
     limiting the writeback from an mmapped page to EOF.

   - Checks for an abort code indicating that the primary vnode in an
     operation was deleted by a third-party are done in the wrong place.

   - Silly rename bugs. This includes an incomplete conversion to the
     new operation handling, duplicate nlink handling, nlink changing
     not being done inside the callback lock and insufficient handling
     of third-party conflicting directory changes.

  And some secondary ones:

   - The UAEOVERFLOW abort code should map to EOVERFLOW not EREMOTEIO.

   - Remove a couple of unused or incompletely used bits.

   - Remove a couple of redundant success checks.

  These seem to fix all the data-corruption bugs found by

./check -afs -g quick

  along with the obvious silly rename bugs and time bugs.

  There are still some test failures, but they seem to fall into two
  classes: firstly, the authentication/security model is different to
  the standard UNIX model and permission is arbitrated by the server and
  cached locally; and secondly, there are a number of features that AFS
  does not support (such as mknod). But in these cases, the tests
  themselves need to be adapted or skipped.

  Using the in-kernel afs client with xfstests also found a bug in the
  AuriStor AFS server that has been fixed for a future release"

* tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix silly rename
  afs: afs_vnode_commit_status() doesn't need to check the RPC error
  afs: Fix use of afs_check_for_remote_deletion()
  afs: Remove afs_operation::abort_code
  afs: Fix yfs_fs_fetch_status() to honour vnode selector
  afs: Remove yfs_fs_fetch_file_status() as it's not used
  afs: Fix the mapping of the UAEOVERFLOW abort code
  afs: Fix truncation issues and mmap writeback size
  afs: Concoct ctimes
  afs: Fix EOF corruption
  afs: afs_write_end() should change i_size under the right lock
  afs: Fix non-setting of mtime when writing into mmap

4 years agoDocumentation: remove SH-5 index entries
Randy Dunlap [Mon, 15 Jun 2020 02:59:07 +0000 (19:59 -0700)]
Documentation: remove SH-5 index entries

Remove SH-5 documentation index entries following the removal
of SH-5 source code.

Error: Cannot open file ../arch/sh/mm/tlb-sh5.c
Error: Cannot open file ../arch/sh/mm/tlb-sh5.c
Error: Cannot open file ../arch/sh/include/asm/tlb_64.h
Error: Cannot open file ../arch/sh/include/asm/tlb_64.h

Fixes: 3b69e8b45711 ("Merge tag 'sh-for-5.8' of git://git.libc.org/linux-sh")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Rich Felker <dalias@libc.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: ysato@users.sourceforge.jp
Cc: linux-sh@vger.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoselinux: fix a double free in cond_read_node()/cond_read_list()
Tom Rix [Mon, 15 Jun 2020 20:45:48 +0000 (13:45 -0700)]
selinux: fix a double free in cond_read_node()/cond_read_list()

Clang static analysis reports this double free error

security/selinux/ss/conditional.c:139:2: warning: Attempt to free released memory [unix.Malloc]
        kfree(node->expr.nodes);
        ^~~~~~~~~~~~~~~~~~~~~~~

When cond_read_node fails, it calls cond_node_destroy which frees the
node but does not poison the entry in the node list.  So when it
returns to its caller cond_read_list, cond_read_list deletes the
partial list.  The latest entry in the list will be deleted twice.

So instead of freeing the node in cond_read_node, let list freeing in
code_read_list handle the freeing the problem node along with all of the
earlier nodes.

Because cond_read_node no longer does any error handling, the goto's
the error case are redundant.  Instead just return the error code.

Cc: stable@vger.kernel.org
Fixes: 60abd3181db2 ("selinux: convert cond_list to array")
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
[PM: subject line tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
4 years agoMerge tag 'flex-array-conversions-5.8-rc2' of git://git.kernel.org/pub/scm/linux...
Linus Torvalds [Wed, 17 Jun 2020 00:23:57 +0000 (17:23 -0700)]
Merge tag 'flex-array-conversions-5.8-rc2' of git://git./linux/kernel/git/gustavoars/linux

Pull flexible-array member conversions from Gustavo A. R. Silva:
 "Replace zero-length arrays with flexible-array members.

  Notice that all of these patches have been baking in linux-next for
  two development cycles now.

  There is a regular need in the kernel to provide a way to declare
  having a dynamically sized set of trailing elements in a structure.
  Kernel code should always use “flexible array members”[1] for these
  cases. The older style of one-element or zero-length arrays should no
  longer be used[2].

  C99 introduced “flexible array members”, which lacks a numeric size
  for the array declaration entirely:

        struct something {
                size_t count;
                struct foo items[];
        };

  This is the way the kernel expects dynamically sized trailing elements
  to be declared. It allows the compiler to generate errors when the
  flexible array does not occur last in the structure, which helps to
  prevent some kind of undefined behavior[3] bugs from being
  inadvertently introduced to the codebase.

  It also allows the compiler to correctly analyze array sizes (via
  sizeof(), CONFIG_FORTIFY_SOURCE, and CONFIG_UBSAN_BOUNDS). For
  instance, there is no mechanism that warns us that the following
  application of the sizeof() operator to a zero-length array always
  results in zero:

        struct something {
                size_t count;
                struct foo items[0];
        };

        struct something *instance;

        instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
        instance->count = count;

        size = sizeof(instance->items) * instance->count;
        memcpy(instance->items, source, size);

  At the last line of code above, size turns out to be zero, when one
  might have thought it represents the total size in bytes of the
  dynamic memory recently allocated for the trailing array items. Here
  are a couple examples of this issue[4][5].

  Instead, flexible array members have incomplete type, and so the
  sizeof() operator may not be applied[6], so any misuse of such
  operators will be immediately noticed at build time.

  The cleanest and least error-prone way to implement this is through
  the use of a flexible array member:

        struct something {
                size_t count;
                struct foo items[];
        };

        struct something *instance;

        instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
        instance->count = count;

        size = sizeof(instance->items[0]) * instance->count;
        memcpy(instance->items, source, size);

  instead"

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
[4] commit f2cd32a443da ("rndis_wlan: Remove logically dead code")
[5] commit ab91c2a89f86 ("tpm: eventlog: Replace zero-length array with flexible-array member")
[6] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html

* tag 'flex-array-conversions-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: (41 commits)
  w1: Replace zero-length array with flexible-array
  tracing/probe: Replace zero-length array with flexible-array
  soc: ti: Replace zero-length array with flexible-array
  tifm: Replace zero-length array with flexible-array
  dmaengine: tegra-apb: Replace zero-length array with flexible-array
  stm class: Replace zero-length array with flexible-array
  Squashfs: Replace zero-length array with flexible-array
  ASoC: SOF: Replace zero-length array with flexible-array
  ima: Replace zero-length array with flexible-array
  sctp: Replace zero-length array with flexible-array
  phy: samsung: Replace zero-length array with flexible-array
  RxRPC: Replace zero-length array with flexible-array
  rapidio: Replace zero-length array with flexible-array
  media: pwc: Replace zero-length array with flexible-array
  firmware: pcdp: Replace zero-length array with flexible-array
  oprofile: Replace zero-length array with flexible-array
  block: Replace zero-length array with flexible-array
  tools/testing/nvdimm: Replace zero-length array with flexible-array
  libata: Replace zero-length array with flexible-array
  kprobes: Replace zero-length array with flexible-array
  ...

4 years agox86/purgatory: Add -fno-stack-protector
Arvind Sankar [Tue, 16 Jun 2020 22:25:47 +0000 (18:25 -0400)]
x86/purgatory: Add -fno-stack-protector

The purgatory Makefile removes -fstack-protector options if they were
configured in, but does not currently add -fno-stack-protector.

If gcc was configured with the --enable-default-ssp configure option,
this results in the stack protector still being enabled for the
purgatory (absent distro-specific specs files that might disable it
again for freestanding compilations), if the main kernel is being
compiled with stack protection enabled (if it's disabled for the main
kernel, the top-level Makefile will add -fno-stack-protector).

This will break the build since commit
  e4160b2e4b02 ("x86/purgatory: Fail the build if purgatory.ro has missing symbols")
and prior to that would have caused runtime failure when trying to use
kexec.

Explicitly add -fno-stack-protector to avoid this, as done in other
Makefiles that need to disable the stack protector.

Reported-by: Gabriel C <nix.or.die@googlemail.com>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoMerge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net...
David S. Miller [Tue, 16 Jun 2020 23:16:24 +0000 (16:16 -0700)]
Merge branch '1GbE' of git://git./linux/kernel/git/jkirsher/net-queue

Jeff Kirsher says:

====================
Intel Wired LAN Driver Updates 2020-06-16

This series contains fixes to e1000 and e1000e.

Chen fixes an e1000e issue where systems could be waken via WoL, even
though the user has disabled the wakeup bit via sysfs.

Vaibhav Gupta updates the e1000 driver to clean up the legacy Power
Management hooks.

Arnd Bergmann cleans up the inconsistent use CONFIG_PM_SLEEP
preprocessor tags, which also resolves the compiler warnings about the
possibility of unused structure.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agotests: test for setns() EINVAL regression
Christian Brauner [Tue, 16 Jun 2020 22:48:54 +0000 (00:48 +0200)]
tests: test for setns() EINVAL regression

Verify that setns() reports EINVAL when an fd is passed that refers to an
open file but the file is not a file descriptor useable to interact with
namespaces.

Cc: Jan Stancek <jstancek@redhat.com>
Cc: Cyril Hrubis <chrubis@suse.cz>
Link: https://lore.kernel.org/lkml/20200615085836.GR12456@shao2-debian
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
4 years agoe1000e: fix unused-function warning
Arnd Bergmann [Wed, 27 May 2020 13:47:00 +0000 (15:47 +0200)]
e1000e: fix unused-function warning

The CONFIG_PM_SLEEP #ifdef checks in this file are inconsistent,
leading to a warning about sometimes unused function:

drivers/net/ethernet/intel/e1000e/netdev.c:137:13: error: unused function 'e1000e_check_me' [-Werror,-Wunused-function]

Rather than adding more #ifdefs, just remove them completely
and mark the PM functions as __maybe_unused to let the compiler
work it out on it own.

Fixes: e086ba2fccda ("e1000e: disable s0ix entry and exit flows for ME systems")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
4 years agoe1000: use generic power management
Vaibhav Gupta [Mon, 25 May 2020 12:27:10 +0000 (17:57 +0530)]
e1000: use generic power management

With legacy PM hooks, it was the responsibility of a driver to manage PCI
states and also the device's power state. The generic approach is to let PCI
core handle the work.

e1000_suspend() calls __e1000_shutdown() to perform intermediate tasks.
__e1000_shutdown() modifies the value of "wake" (device should be wakeup
enabled or not), responsible for controlling the flow of legacy PM.

Since, PCI core has no idea about the value of "wake", new code for generic
PM may produce unexpected results. Thus, use "device_set_wakeup_enable()"
to wakeup-enable the device accordingly.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
4 years agoe1000e: Do not wake up the system via WOL if device wakeup is disabled
Chen Yu [Thu, 21 May 2020 17:59:00 +0000 (01:59 +0800)]
e1000e: Do not wake up the system via WOL if device wakeup is disabled

Currently the system will be woken up via WOL(Wake On LAN) even if the
device wakeup ability has been disabled via sysfs:
 cat /sys/devices/pci0000:00/0000:00:1f.6/power/wakeup
 disabled

The system should not be woken up if the user has explicitly
disabled the wake up ability for this device.

This patch clears the WOL ability of this network device if the
user has disabled the wake up ability in sysfs.

Fixes: bc7f75fa9788 ("[E1000E]: New pci-express e1000 driver")
Reported-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
4 years agonsproxy: restore EINVAL for non-namespace file descriptor
Christian Brauner [Tue, 16 Jun 2020 22:33:12 +0000 (00:33 +0200)]
nsproxy: restore EINVAL for non-namespace file descriptor

The LTP testsuite reported a regression where users would now see EBADF
returned instead of EINVAL when an fd was passed that referred to an open
file but the file was not a nsfd. Fix this by continuing to report EINVAL.

Reported-by: kernel test robot <rong.a.chen@intel.com>
Cc: Jan Stancek <jstancek@redhat.com>
Cc: Cyril Hrubis <chrubis@suse.cz>
Link: https://lore.kernel.org/lkml/20200615085836.GR12456@shao2-debian
Fixes: 303cc571d107 ("nsproxy: attach to namespaces via pidfds")
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
4 years agolan743x: add MODULE_DEVICE_TABLE for module loading alias
Tim Harvey [Tue, 16 Jun 2020 15:31:58 +0000 (08:31 -0700)]
lan743x: add MODULE_DEVICE_TABLE for module loading alias

Without a MODULE_DEVICE_TABLE the attributes are missing that create
an alias for auto-loading the module in userspace via hotplug.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoafs: Fix silly rename
David Howells [Mon, 15 Jun 2020 16:36:58 +0000 (17:36 +0100)]
afs: Fix silly rename

Fix AFS's silly rename by the following means:

 (1) Set the destination directory in afs_do_silly_rename() so as to avoid
     misbehaviour and indicate that the directory data version will
     increment by 1 so as to avoid warnings about unexpected changes in the
     DV.  Also indicate that the ctime should be updated to avoid xfstest
     grumbling.

 (2) Note when the server indicates that a directory changed more than we
     expected (AFS_OPERATION_DIR_CONFLICT), indicating a conflict with a
     third party change, checking on successful completion of unlink and
     rename.

     The problem is that the FS.RemoveFile RPC op doesn't report the status
     of the unlinked file, though YFS.RemoveFile2 does.  This can be
     mitigated by the assumption that if the directory DV cranked by
     exactly 1, we can be sure we removed one link from the file; further,
     ordinarily in AFS, files cannot be hardlinked across directories, so
     if we reduce nlink to 0, the file is deleted.

     However, if the directory DV jumps by more than 1, we cannot know if a
     third party intervened by adding or removing a link on the file we
     just removed a link from.

     The same also goes for any vnode that is at the destination of the
     FS.Rename RPC op.

 (3) Make afs_vnode_commit_status() apply the nlink drop inside the cb_lock
     section along with the other attribute updates if ->op_unlinked is set
     on the descriptor for the appropriate vnode.

 (4) Issue a follow up status fetch to the unlinked file in the event of a
     third party conflict that makes it impossible for us to know if we
     actually deleted the file or not.

 (5) Provide a flag, AFS_VNODE_SILLY_DELETED, to make afs_getattr() lie to
     the user about the nlink of a silly deleted file so that it appears as
     0, not 1.

Found with the generic/035 and generic/084 xfstests.

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
4 years agomlxsw: spectrum: Adjust headroom buffers for 8x ports
Ido Schimmel [Tue, 16 Jun 2020 07:14:58 +0000 (10:14 +0300)]
mlxsw: spectrum: Adjust headroom buffers for 8x ports

The port's headroom buffers are used to store packets while they
traverse the device's pipeline and also to store packets that are egress
mirrored.

On Spectrum-3, ports with eight lanes use two headroom buffers between
which the configured headroom size is split.

In order to prevent packet loss, multiply the calculated headroom size
by two for 8x ports.

Fixes: da382875c616 ("mlxsw: spectrum: Extend to support Spectrum-3 ASIC")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agobareudp: Fixed configuration to avoid having garbage values
Martin [Tue, 16 Jun 2020 05:48:58 +0000 (11:18 +0530)]
bareudp: Fixed configuration to avoid having garbage values

Code to initialize the conf structure while gathering the configuration
of the device was missing.

Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Martin <martin.varghese@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agomvpp2: remove module bugfix
Sven Auhagen [Tue, 16 Jun 2020 04:35:29 +0000 (06:35 +0200)]
mvpp2: remove module bugfix

The remove function does not destroy all
BM Pools when per cpu pool is active.

When reloading the mvpp2 as a module the BM Pools
are still active in hardware and due to the bug
have twice the size now old + new.

This eventually leads to a kernel crash.

v2:
* add Fixes tag

Fixes: 7d04b0b13b11 ("mvpp2: percpu buffers")
Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agotcp: grow window for OOO packets only for SACK flows
Eric Dumazet [Tue, 16 Jun 2020 03:37:07 +0000 (20:37 -0700)]
tcp: grow window for OOO packets only for SACK flows

Back in 2013, we made a change that broke fast retransmit
for non SACK flows.

Indeed, for these flows, a sender needs to receive three duplicate
ACK before starting fast retransmit. Sending ACK with different
receive window do not count.

Even if enabling SACK is strongly recommended these days,
there still are some cases where it has to be disabled.

Not increasing the window seems better than having to
rely on RTO.

After the fix, following packetdrill test gives :

// Initialize connection
    0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
   +0 bind(3, ..., ...) = 0
   +0 listen(3, 1) = 0

   +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
   +0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
   +0 < . 1:1(0) ack 1 win 514

   +0 accept(3, ..., ...) = 4

   +0 < . 1:1001(1000) ack 1 win 514
// Quick ack
   +0 > . 1:1(0) ack 1001 win 264

   +0 < . 2001:3001(1000) ack 1 win 514
// DUPACK : Normally we should not change the window
   +0 > . 1:1(0) ack 1001 win 264

   +0 < . 3001:4001(1000) ack 1 win 514
// DUPACK : Normally we should not change the window
   +0 > . 1:1(0) ack 1001 win 264

   +0 < . 4001:5001(1000) ack 1 win 514
// DUPACK : Normally we should not change the window
    +0 > . 1:1(0) ack 1001 win 264

   +0 < . 1001:2001(1000) ack 1 win 514
// Hole is repaired.
   +0 > . 1:1(0) ack 5001 win 272

Fixes: 4e4f1fc22681 ("tcp: properly increase rcv_ssthresh for ofo packets")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge tag 'mfd-fixes-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Linus Torvalds [Tue, 16 Jun 2020 18:07:02 +0000 (11:07 -0700)]
Merge tag 'mfd-fixes-5.8' of git://git./linux/kernel/git/lee/mfd

Pull MFD fix from Lee Jones:
 "Fix NULL pointer dereference in mt6360 driver"

* tag 'mfd-fixes-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd:
  mfd: mt6360: Fix register driver NULL pointer by adding driver name

4 years agoarm64: sve: Fix build failure when ARM64_SVE=y and SYSCTL=n
Will Deacon [Tue, 16 Jun 2020 17:29:11 +0000 (18:29 +0100)]
arm64: sve: Fix build failure when ARM64_SVE=y and SYSCTL=n

When I squashed the 'allnoconfig' compiler warning about the
set_sve_default_vl() function being defined but not used in commit
1e570f512cbd ("arm64/sve: Eliminate data races on sve_default_vl"), I
accidentally broke the build for configs where ARM64_SVE is enabled, but
SYSCTL is not.

Fix this by only compiling the SVE sysctl support if both CONFIG_SVE=y
and CONFIG_SYSCTL=y.

Cc: Dave Martin <Dave.Martin@arm.com>
Reported-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200616131808.GA1040@lca.pw
Signed-off-by: Will Deacon <will@kernel.org>
4 years agobtrfs: use kfree() in btrfs_ioctl_get_subvol_info()
Waiman Long [Tue, 16 Jun 2020 15:31:59 +0000 (11:31 -0400)]
btrfs: use kfree() in btrfs_ioctl_get_subvol_info()

In btrfs_ioctl_get_subvol_info(), there is a classic case where kzalloc()
was incorrectly paired with kzfree(). According to David Sterba, there
isn't any sensitive information in the subvol_info that needs to be
cleared before freeing. So kzfree() isn't really needed, use kfree()
instead.

Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix RWF_NOWAIT writes blocking on extent locks and waiting for IO
Filipe Manana [Mon, 15 Jun 2020 17:49:39 +0000 (18:49 +0100)]
btrfs: fix RWF_NOWAIT writes blocking on extent locks and waiting for IO

A RWF_NOWAIT write is not supposed to wait on filesystem locks that can be
held for a long time or for ongoing IO to complete.

However when calling check_can_nocow(), if the inode has prealloc extents
or has the NOCOW flag set, we can block on extent (file range) locks
through the call to btrfs_lock_and_flush_ordered_range(). Such lock can
take a significant amount of time to be available. For example, a fiemap
task may be running, and iterating through the entire file range checking
all extents and doing backref walking to determine if they are shared,
or a readpage operation may be in progress.

Also at btrfs_lock_and_flush_ordered_range(), called by check_can_nocow(),
after locking the file range we wait for any existing ordered extent that
is in progress to complete. Another operation that can take a significant
amount of time and defeat the purpose of RWF_NOWAIT.

So fix this by trying to lock the file range and if it's currently locked
return -EAGAIN to user space. If we are able to lock the file range without
waiting and there is an ordered extent in the range, return -EAGAIN as
well, instead of waiting for it to complete. Finally, don't bother trying
to lock the snapshot lock of the root when attempting a RWF_NOWAIT write,
as that is only important for buffered writes.

Fixes: edf064e7c6fec3 ("btrfs: nowait aio support")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix RWF_NOWAIT write not failling when we need to cow
Filipe Manana [Mon, 15 Jun 2020 17:49:13 +0000 (18:49 +0100)]
btrfs: fix RWF_NOWAIT write not failling when we need to cow

If we attempt to do a RWF_NOWAIT write against a file range for which we
can only do NOCOW for a part of it, due to the existence of holes or
shared extents for example, we proceed with the write as if it were
possible to NOCOW the whole range.

Example:

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt

  $ touch /mnt/sdj/bar
  $ chattr +C /mnt/sdj/bar

  $ xfs_io -d -c "pwrite -S 0xab -b 256K 0 256K" /mnt/bar
  wrote 262144/262144 bytes at offset 0
  256 KiB, 1 ops; 0.0003 sec (694.444 MiB/sec and 2777.7778 ops/sec)

  $ xfs_io -c "fpunch 64K 64K" /mnt/bar
  $ sync

  $ xfs_io -d -c "pwrite -N -V 1 -b 128K -S 0xfe 0 128K" /mnt/bar
  wrote 131072/131072 bytes at offset 0
  128 KiB, 1 ops; 0.0007 sec (160.051 MiB/sec and 1280.4097 ops/sec)

This last write should fail with -EAGAIN since the file range from 64K to
128K is a hole. On xfs it fails, as expected, but on ext4 it currently
succeeds because apparently it is expensive to check if there are extents
allocated for the whole range, but I'll check with the ext4 people.

Fix the issue by checking if check_can_nocow() returns a number of
NOCOW'able bytes smaller then the requested number of bytes, and if it
does return -EAGAIN.

Fixes: edf064e7c6fec3 ("btrfs: nowait aio support")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix failure of RWF_NOWAIT write into prealloc extent beyond eof
Filipe Manana [Mon, 15 Jun 2020 17:48:58 +0000 (18:48 +0100)]
btrfs: fix failure of RWF_NOWAIT write into prealloc extent beyond eof

If we attempt to write to prealloc extent located after eof using a
RWF_NOWAIT write, we always fail with -EAGAIN.

We do actually check if we have an allocated extent for the write at
the start of btrfs_file_write_iter() through a call to check_can_nocow(),
but later when we go into the actual direct IO write path we simply
return -EAGAIN if the write starts at or beyond EOF.

Trivial to reproduce:

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt

  $ touch /mnt/foo
  $ chattr +C /mnt/foo

  $ xfs_io -d -c "pwrite -S 0xab 0 64K" /mnt/foo
  wrote 65536/65536 bytes at offset 0
  64 KiB, 16 ops; 0.0004 sec (135.575 MiB/sec and 34707.1584 ops/sec)

  $ xfs_io -c "falloc -k 64K 1M" /mnt/foo

  $ xfs_io -d -c "pwrite -N -V 1 -S 0xfe -b 64K 64K 64K" /mnt/foo
  pwrite: Resource temporarily unavailable

On xfs and ext4 the write succeeds, as expected.

Fix this by removing the wrong check at btrfs_direct_IO().

Fixes: edf064e7c6fec3 ("btrfs: nowait aio support")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix hang on snapshot creation after RWF_NOWAIT write
Filipe Manana [Mon, 15 Jun 2020 17:46:01 +0000 (18:46 +0100)]
btrfs: fix hang on snapshot creation after RWF_NOWAIT write

If we do a successful RWF_NOWAIT write we end up locking the snapshot lock
of the inode, through a call to check_can_nocow(), but we never unlock it.

This means the next attempt to create a snapshot on the subvolume will
hang forever.

Trivial reproducer:

  $ mkfs.btrfs -f /dev/sdb
  $ mount /dev/sdb /mnt

  $ touch /mnt/foobar
  $ chattr +C /mnt/foobar
  $ xfs_io -d -c "pwrite -S 0xab 0 64K" /mnt/foobar
  $ xfs_io -d -c "pwrite -N -V 1 -S 0xfe 0 64K" /mnt/foobar

  $ btrfs subvolume snapshot -r /mnt /mnt/snap
    --> hangs

Fix this by unlocking the snapshot lock if check_can_nocow() returned
success.

Fixes: edf064e7c6fec3 ("btrfs: nowait aio support")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: check if a log root exists before locking the log_mutex on unlink
Filipe Manana [Mon, 15 Jun 2020 09:38:44 +0000 (10:38 +0100)]
btrfs: check if a log root exists before locking the log_mutex on unlink

This brings back an optimization that commit e678934cbe5f02 ("btrfs:
Remove unnecessary check from join_running_log_trans") removed, but in
a different form. So it's almost equivalent to a revert.

That commit removed an optimization where we avoid locking a root's
log_mutex when there is no log tree created in the current transaction.
The affected code path is triggered through unlink operations.

That commit was based on the assumption that the optimization was not
necessary because we used to have the following checks when the patch
was authored:

  int btrfs_del_dir_entries_in_log(...)
  {
        (...)
        if (dir->logged_trans < trans->transid)
            return 0;

        ret = join_running_log_trans(root);
        (...)
   }

   int btrfs_del_inode_ref_in_log(...)
   {
        (...)
        if (inode->logged_trans < trans->transid)
            return 0;

        ret = join_running_log_trans(root);
        (...)
   }

However before that patch was merged, another patch was merged first which
replaced those checks because they were buggy.

That other patch corresponds to commit 803f0f64d17769 ("Btrfs: fix fsync
not persisting dentry deletions due to inode evictions"). The assumption
that if the logged_trans field of an inode had a smaller value then the
current transaction's generation (transid) meant that the inode was not
logged in the current transaction was only correct if the inode was not
evicted and reloaded in the current transaction. So the corresponding bug
fix changed those checks and replaced them with the following helper
function:

  static bool inode_logged(struct btrfs_trans_handle *trans,
                           struct btrfs_inode *inode)
  {
        if (inode->logged_trans == trans->transid)
                return true;

        if (inode->last_trans == trans->transid &&
            test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags) &&
            !test_bit(BTRFS_FS_LOG_RECOVERING, &trans->fs_info->flags))
                return true;

        return false;
  }

So if we have a subvolume without a log tree in the current transaction
(because we had no fsyncs), every time we unlink an inode we can end up
trying to lock the log_mutex of the root through join_running_log_trans()
twice, once for the inode being unlinked (by btrfs_del_inode_ref_in_log())
and once for the parent directory (with btrfs_del_dir_entries_in_log()).

This means if we have several unlink operations happening in parallel for
inodes in the same subvolume, and the those inodes and/or their parent
inode were changed in the current transaction, we end up having a lot of
contention on the log_mutex.

The test robots from intel reported a -30.7% performance regression for
a REAIM test after commit e678934cbe5f02 ("btrfs: Remove unnecessary check
from join_running_log_trans").

So just bring back the optimization to join_running_log_trans() where we
check first if a log root exists before trying to lock the log_mutex. This
is done by checking for a bit that is set on the root when a log tree is
created and removed when a log tree is freed (at transaction commit time).

Commit e678934cbe5f02 ("btrfs: Remove unnecessary check from
join_running_log_trans") was merged in the 5.4 merge window while commit
803f0f64d17769 ("Btrfs: fix fsync not persisting dentry deletions due to
inode evictions") was merged in the 5.3 merge window. But the first
commit was actually authored before the second commit (May 23 2019 vs
June 19 2019).

Reported-by: kernel test robot <rong.a.chen@intel.com>
Link: https://lore.kernel.org/lkml/20200611090233.GL12456@shao2-debian/
Fixes: e678934cbe5f02 ("btrfs: Remove unnecessary check from join_running_log_trans")
CC: stable@vger.kernel.org # 5.4+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix bytes_may_use underflow when running balance and scrub in parallel
Filipe Manana [Mon, 8 Jun 2020 12:33:05 +0000 (13:33 +0100)]
btrfs: fix bytes_may_use underflow when running balance and scrub in parallel

When balance and scrub are running in parallel it is possible to end up
with an underflow of the bytes_may_use counter of the data space_info
object, which triggers a warning like the following:

   [134243.793196] BTRFS info (device sdc): relocating block group 1104150528 flags data
   [134243.806891] ------------[ cut here ]------------
   [134243.807561] WARNING: CPU: 1 PID: 26884 at fs/btrfs/space-info.h:125 btrfs_add_reserved_bytes+0x1da/0x280 [btrfs]
   [134243.808819] Modules linked in: btrfs blake2b_generic xor (...)
   [134243.815779] CPU: 1 PID: 26884 Comm: kworker/u8:8 Tainted: G        W         5.6.0-rc7-btrfs-next-58 #5
   [134243.816944] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
   [134243.818389] Workqueue: writeback wb_workfn (flush-btrfs-108483)
   [134243.819186] RIP: 0010:btrfs_add_reserved_bytes+0x1da/0x280 [btrfs]
   [134243.819963] Code: 0b f2 85 (...)
   [134243.822271] RSP: 0018:ffffa4160aae7510 EFLAGS: 00010287
   [134243.822929] RAX: 000000000000c000 RBX: ffff96159a8c1000 RCX: 0000000000000000
   [134243.823816] RDX: 0000000000008000 RSI: 0000000000000000 RDI: ffff96158067a810
   [134243.824742] RBP: ffff96158067a800 R08: 0000000000000001 R09: 0000000000000000
   [134243.825636] R10: ffff961501432a40 R11: 0000000000000000 R12: 000000000000c000
   [134243.826532] R13: 0000000000000001 R14: ffffffffffff4000 R15: ffff96158067a810
   [134243.827432] FS:  0000000000000000(0000) GS:ffff9615baa00000(0000) knlGS:0000000000000000
   [134243.828451] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   [134243.829184] CR2: 000055bd7e414000 CR3: 00000001077be004 CR4: 00000000003606e0
   [134243.830083] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   [134243.830975] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
   [134243.831867] Call Trace:
   [134243.832211]  find_free_extent+0x4a0/0x16c0 [btrfs]
   [134243.832846]  btrfs_reserve_extent+0x91/0x180 [btrfs]
   [134243.833487]  cow_file_range+0x12d/0x490 [btrfs]
   [134243.834080]  fallback_to_cow+0x82/0x1b0 [btrfs]
   [134243.834689]  ? release_extent_buffer+0x121/0x170 [btrfs]
   [134243.835370]  run_delalloc_nocow+0x33f/0xa30 [btrfs]
   [134243.836032]  btrfs_run_delalloc_range+0x1ea/0x6d0 [btrfs]
   [134243.836725]  ? find_lock_delalloc_range+0x221/0x250 [btrfs]
   [134243.837450]  writepage_delalloc+0xe8/0x150 [btrfs]
   [134243.838059]  __extent_writepage+0xe8/0x4c0 [btrfs]
   [134243.838674]  extent_write_cache_pages+0x237/0x530 [btrfs]
   [134243.839364]  extent_writepages+0x44/0xa0 [btrfs]
   [134243.839946]  do_writepages+0x23/0x80
   [134243.840401]  __writeback_single_inode+0x59/0x700
   [134243.841006]  writeback_sb_inodes+0x267/0x5f0
   [134243.841548]  __writeback_inodes_wb+0x87/0xe0
   [134243.842091]  wb_writeback+0x382/0x590
   [134243.842574]  ? wb_workfn+0x4a2/0x6c0
   [134243.843030]  wb_workfn+0x4a2/0x6c0
   [134243.843468]  process_one_work+0x26d/0x6a0
   [134243.843978]  worker_thread+0x4f/0x3e0
   [134243.844452]  ? process_one_work+0x6a0/0x6a0
   [134243.844981]  kthread+0x103/0x140
   [134243.845400]  ? kthread_create_worker_on_cpu+0x70/0x70
   [134243.846030]  ret_from_fork+0x3a/0x50
   [134243.846494] irq event stamp: 0
   [134243.846892] hardirqs last  enabled at (0): [<0000000000000000>] 0x0
   [134243.847682] hardirqs last disabled at (0): [<ffffffffb2abdedf>] copy_process+0x74f/0x2020
   [134243.848687] softirqs last  enabled at (0): [<ffffffffb2abdedf>] copy_process+0x74f/0x2020
   [134243.849913] softirqs last disabled at (0): [<0000000000000000>] 0x0
   [134243.850698] ---[ end trace bd7c03622e0b0a96 ]---
   [134243.851335] ------------[ cut here ]------------

When relocating a data block group, for each extent allocated in the
block group we preallocate another extent with the same size for the
data relocation inode (we do it at prealloc_file_extent_cluster()).
We reserve space by calling btrfs_check_data_free_space(), which ends
up incrementing the data space_info's bytes_may_use counter, and
then call btrfs_prealloc_file_range() to allocate the extent, which
always decrements the bytes_may_use counter by the same amount.

The expectation is that writeback of the data relocation inode always
follows a NOCOW path, by writing into the preallocated extents. However,
when starting writeback we might end up falling back into the COW path,
because the block group that contains the preallocated extent was turned
into RO mode by a scrub running in parallel. The COW path then calls the
extent allocator which ends up calling btrfs_add_reserved_bytes(), and
this function decrements the bytes_may_use counter of the data space_info
object by an amount corresponding to the size of the allocated extent,
despite we haven't previously incremented it. When the counter currently
has a value smaller then the allocated extent we reset the counter to 0
and emit a warning, otherwise we just decrement it and slowly mess up
with this counter which is crucial for space reservation, the end result
can be granting reserved space to tasks when there isn't really enough
free space, and having the tasks fail later in critical places where
error handling consists of a transaction abort or hitting a BUG_ON().

Fix this by making sure that if we fallback to the COW path for a data
relocation inode, we increment the bytes_may_use counter of the data
space_info object. The COW path will then decrement it at
btrfs_add_reserved_bytes() on success or through its error handling part
by a call to extent_clear_unlock_delalloc() (which ends up calling
btrfs_clear_delalloc_extent() that does the decrement operation) in case
of an error.

Test case btrfs/061 from fstests could sporadically trigger this.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix data block group relocation failure due to concurrent scrub
Filipe Manana [Mon, 8 Jun 2020 12:32:55 +0000 (13:32 +0100)]
btrfs: fix data block group relocation failure due to concurrent scrub

When running relocation of a data block group while scrub is running in
parallel, it is possible that the relocation will fail and abort the
current transaction with an -EINVAL error:

   [134243.988595] BTRFS info (device sdc): found 14 extents, stage: move data extents
   [134243.999871] ------------[ cut here ]------------
   [134244.000741] BTRFS: Transaction aborted (error -22)
   [134244.001692] WARNING: CPU: 0 PID: 26954 at fs/btrfs/ctree.c:1071 __btrfs_cow_block+0x6a7/0x790 [btrfs]
   [134244.003380] Modules linked in: btrfs blake2b_generic xor raid6_pq (...)
   [134244.012577] CPU: 0 PID: 26954 Comm: btrfs Tainted: G        W         5.6.0-rc7-btrfs-next-58 #5
   [134244.014162] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
   [134244.016184] RIP: 0010:__btrfs_cow_block+0x6a7/0x790 [btrfs]
   [134244.017151] Code: 48 c7 c7 (...)
   [134244.020549] RSP: 0018:ffffa41607863888 EFLAGS: 00010286
   [134244.021515] RAX: 0000000000000000 RBX: ffff9614bdfe09c8 RCX: 0000000000000000
   [134244.022822] RDX: 0000000000000001 RSI: ffffffffb3d63980 RDI: 0000000000000001
   [134244.024124] RBP: ffff961589e8c000 R08: 0000000000000000 R09: 0000000000000001
   [134244.025424] R10: ffffffffc0ae5955 R11: 0000000000000000 R12: ffff9614bd530d08
   [134244.026725] R13: ffff9614ced41b88 R14: ffff9614bdfe2a48 R15: 0000000000000000
   [134244.028024] FS:  00007f29b63c08c0(0000) GS:ffff9615ba600000(0000) knlGS:0000000000000000
   [134244.029491] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   [134244.030560] CR2: 00007f4eb339b000 CR3: 0000000130d6e006 CR4: 00000000003606f0
   [134244.031997] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   [134244.033153] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
   [134244.034484] Call Trace:
   [134244.034984]  btrfs_cow_block+0x12b/0x2b0 [btrfs]
   [134244.035859]  do_relocation+0x30b/0x790 [btrfs]
   [134244.036681]  ? do_raw_spin_unlock+0x49/0xc0
   [134244.037460]  ? _raw_spin_unlock+0x29/0x40
   [134244.038235]  relocate_tree_blocks+0x37b/0x730 [btrfs]
   [134244.039245]  relocate_block_group+0x388/0x770 [btrfs]
   [134244.040228]  btrfs_relocate_block_group+0x161/0x2e0 [btrfs]
   [134244.041323]  btrfs_relocate_chunk+0x36/0x110 [btrfs]
   [134244.041345]  btrfs_balance+0xc06/0x1860 [btrfs]
   [134244.043382]  ? btrfs_ioctl_balance+0x27c/0x310 [btrfs]
   [134244.045586]  btrfs_ioctl_balance+0x1ed/0x310 [btrfs]
   [134244.045611]  btrfs_ioctl+0x1880/0x3760 [btrfs]
   [134244.049043]  ? do_raw_spin_unlock+0x49/0xc0
   [134244.049838]  ? _raw_spin_unlock+0x29/0x40
   [134244.050587]  ? __handle_mm_fault+0x11b3/0x14b0
   [134244.051417]  ? ksys_ioctl+0x92/0xb0
   [134244.052070]  ksys_ioctl+0x92/0xb0
   [134244.052701]  ? trace_hardirqs_off_thunk+0x1a/0x1c
   [134244.053511]  __x64_sys_ioctl+0x16/0x20
   [134244.054206]  do_syscall_64+0x5c/0x280
   [134244.054891]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
   [134244.055819] RIP: 0033:0x7f29b51c9dd7
   [134244.056491] Code: 00 00 00 (...)
   [134244.059767] RSP: 002b:00007ffcccc1dd08 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
   [134244.061168] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f29b51c9dd7
   [134244.062474] RDX: 00007ffcccc1dda0 RSI: 00000000c4009420 RDI: 0000000000000003
   [134244.063771] RBP: 0000000000000003 R08: 00005565cea4b000 R09: 0000000000000000
   [134244.065032] R10: 0000000000000541 R11: 0000000000000202 R12: 00007ffcccc2060a
   [134244.066327] R13: 00007ffcccc1dda0 R14: 0000000000000002 R15: 00007ffcccc1dec0
   [134244.067626] irq event stamp: 0
   [134244.068202] hardirqs last  enabled at (0): [<0000000000000000>] 0x0
   [134244.069351] hardirqs last disabled at (0): [<ffffffffb2abdedf>] copy_process+0x74f/0x2020
   [134244.070909] softirqs last  enabled at (0): [<ffffffffb2abdedf>] copy_process+0x74f/0x2020
   [134244.072392] softirqs last disabled at (0): [<0000000000000000>] 0x0
   [134244.073432] ---[ end trace bd7c03622e0b0a99 ]---

The -EINVAL error comes from the following chain of function calls:

  __btrfs_cow_block() <-- aborts the transaction
    btrfs_reloc_cow_block()
      replace_file_extents()
        get_new_location() <-- returns -EINVAL

When relocating a data block group, for each allocated extent of the block
group, we preallocate another extent (at prealloc_file_extent_cluster()),
associated with the data relocation inode, and then dirty all its pages.
These preallocated extents have, and must have, the same size that extents
from the data block group being relocated have.

Later before we start the relocation stage that updates pointers (bytenr
field of file extent items) to point to the the new extents, we trigger
writeback for the data relocation inode. The expectation is that writeback
will write the pages to the previously preallocated extents, that it
follows the NOCOW path. That is generally the case, however, if a scrub
is running it may have turned the block group that contains those extents
into RO mode, in which case writeback falls back to the COW path.

However in the COW path instead of allocating exactly one extent with the
expected size, the allocator may end up allocating several smaller extents
due to free space fragmentation - because we tell it at cow_file_range()
that the minimum allocation size can match the filesystem's sector size.
This later breaks the relocation's expectation that an extent associated
to a file extent item in the data relocation inode has the same size as
the respective extent pointed by a file extent item in another tree - in
this case the extent to which the relocation inode poins to is smaller,
causing relocation.c:get_new_location() to return -EINVAL.

For example, if we are relocating a data block group X that has a logical
address of X and the block group has an extent allocated at the logical
address X + 128KiB with a size of 64KiB:

1) At prealloc_file_extent_cluster() we allocate an extent for the data
   relocation inode with a size of 64KiB and associate it to the file
   offset 128KiB (X + 128KiB - X) of the data relocation inode. This
   preallocated extent was allocated at block group Z;

2) A scrub running in parallel turns block group Z into RO mode and
   starts scrubing its extents;

3) Relocation triggers writeback for the data relocation inode;

4) When running delalloc (btrfs_run_delalloc_range()), we try first the
   NOCOW path because the data relocation inode has BTRFS_INODE_PREALLOC
   set in its flags. However, because block group Z is in RO mode, the
   NOCOW path (run_delalloc_nocow()) falls back into the COW path, by
   calling cow_file_range();

5) At cow_file_range(), in the first iteration of the while loop we call
   btrfs_reserve_extent() to allocate a 64KiB extent and pass it a minimum
   allocation size of 4KiB (fs_info->sectorsize). Due to free space
   fragmentation, btrfs_reserve_extent() ends up allocating two extents
   of 32KiB each, each one on a different iteration of that while loop;

6) Writeback of the data relocation inode completes;

7) Relocation proceeds and ends up at relocation.c:replace_file_extents(),
   with a leaf which has a file extent item that points to the data extent
   from block group X, that has a logical address (bytenr) of X + 128KiB
   and a size of 64KiB. Then it calls get_new_location(), which does a
   lookup in the data relocation tree for a file extent item starting at
   offset 128KiB (X + 128KiB - X) and belonging to the data relocation
   inode. It finds a corresponding file extent item, however that item
   points to an extent that has a size of 32KiB, which doesn't match the
   expected size of 64KiB, resuling in -EINVAL being returned from this
   function and propagated up to __btrfs_cow_block(), which aborts the
   current transaction.

To fix this make sure that at cow_file_range() when we call the allocator
we pass it a minimum allocation size corresponding the desired extent size
if the inode belongs to the data relocation tree, otherwise pass it the
filesystem's sector size as the minimum allocation size.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix race between block group removal and block group creation
Filipe Manana [Mon, 1 Jun 2020 18:12:19 +0000 (19:12 +0100)]
btrfs: fix race between block group removal and block group creation

There is a race between block group removal and block group creation
when the removal is completed by a task running fitrim or scrub. When
this happens we end up failing the block group creation with an error
-EEXIST since we attempt to insert a duplicate block group item key
in the extent tree. That results in a transaction abort.

The race happens like this:

1) Task A is doing a fitrim, and at btrfs_trim_block_group() it freezes
   block group X with btrfs_freeze_block_group() (until very recently
   that was named btrfs_get_block_group_trimming());

2) Task B starts removing block group X, either because it's now unused
   or due to relocation for example. So at btrfs_remove_block_group(),
   while holding the chunk mutex and the block group's lock, it sets
   the 'removed' flag of the block group and it sets the local variable
   'remove_em' to false, because the block group is currently frozen
   (its 'frozen' counter is > 0, until very recently this counter was
   named 'trimming');

3) Task B unlocks the block group and the chunk mutex;

4) Task A is done trimming the block group and unfreezes the block group
   by calling btrfs_unfreeze_block_group() (until very recently this was
   named btrfs_put_block_group_trimming()). In this function we lock the
   block group and set the local variable 'cleanup' to true because we
   were able to decrement the block group's 'frozen' counter down to 0 and
   the flag 'removed' is set in the block group.

   Since 'cleanup' is set to true, it locks the chunk mutex and removes
   the extent mapping representing the block group from the mapping tree;

5) Task C allocates a new block group Y and it picks up the logical address
   that block group X had as the logical address for Y, because X was the
   block group with the highest logical address and now the second block
   group with the highest logical address, the last in the fs mapping tree,
   ends at an offset corresponding to block group X's logical address (this
   logical address selection is done at volumes.c:find_next_chunk()).

   At this point the new block group Y does not have yet its item added
   to the extent tree (nor the corresponding device extent items and
   chunk item in the device and chunk trees). The new group Y is added to
   the list of pending block groups in the transaction handle;

6) Before task B proceeds to removing the block group item for block
   group X from the extent tree, which has a key matching:

   (X logical offset, BTRFS_BLOCK_GROUP_ITEM_KEY, length)

   task C while ending its transaction handle calls
   btrfs_create_pending_block_groups(), which finds block group Y and
   tries to insert the block group item for Y into the exten tree, which
   fails with -EEXIST since logical offset is the same that X had and
   task B hasn't yet deleted the key from the extent tree.
   This failure results in a transaction abort, producing a stack like
   the following:

------------[ cut here ]------------
 BTRFS: Transaction aborted (error -17)
 WARNING: CPU: 2 PID: 19736 at fs/btrfs/block-group.c:2074 btrfs_create_pending_block_groups+0x1eb/0x260 [btrfs]
 Modules linked in: btrfs blake2b_generic xor raid6_pq (...)
 CPU: 2 PID: 19736 Comm: fsstress Tainted: G        W         5.6.0-rc7-btrfs-next-58 #5
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
 RIP: 0010:btrfs_create_pending_block_groups+0x1eb/0x260 [btrfs]
 Code: ff ff ff 48 8b 55 50 f0 48 (...)
 RSP: 0018:ffffa4160a1c7d58 EFLAGS: 00010286
 RAX: 0000000000000000 RBX: ffff961581909d98 RCX: 0000000000000000
 RDX: 0000000000000001 RSI: ffffffffb3d63990 RDI: 0000000000000001
 RBP: ffff9614f3356a58 R08: 0000000000000000 R09: 0000000000000001
 R10: ffff9615b65b0040 R11: 0000000000000000 R12: ffff961581909c10
 R13: ffff9615b0c32000 R14: ffff9614f3356ab0 R15: ffff9614be779000
 FS:  00007f2ce2841e80(0000) GS:ffff9615bae00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000555f18780000 CR3: 0000000131d34005 CR4: 00000000003606e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 Call Trace:
  btrfs_start_dirty_block_groups+0x398/0x4e0 [btrfs]
  btrfs_commit_transaction+0xd0/0xc50 [btrfs]
  ? btrfs_attach_transaction_barrier+0x1e/0x50 [btrfs]
  ? __ia32_sys_fdatasync+0x20/0x20
  iterate_supers+0xdb/0x180
  ksys_sync+0x60/0xb0
  __ia32_sys_sync+0xa/0x10
  do_syscall_64+0x5c/0x280
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
 RIP: 0033:0x7f2ce1d4d5b7
 Code: 83 c4 08 48 3d 01 (...)
 RSP: 002b:00007ffd8b558c58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a2
 RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007f2ce1d4d5b7
 RDX: 00000000ffffffff RSI: 00000000186ba07b RDI: 000000000000002c
 RBP: 0000555f17b9e520 R08: 0000000000000012 R09: 000000000000ce00
 R10: 0000000000000078 R11: 0000000000000202 R12: 0000000000000032
 R13: 0000000051eb851f R14: 00007ffd8b558cd0 R15: 0000555f1798ec20
 irq event stamp: 0
 hardirqs last  enabled at (0): [<0000000000000000>] 0x0
 hardirqs last disabled at (0): [<ffffffffb2abdedf>] copy_process+0x74f/0x2020
 softirqs last  enabled at (0): [<ffffffffb2abdedf>] copy_process+0x74f/0x2020
 softirqs last disabled at (0): [<0000000000000000>] 0x0
 ---[ end trace bd7c03622e0b0a9c ]---

Fix this simply by making btrfs_remove_block_group() remove the block
group's item from the extent tree before it flags the block group as
removed. Also make the free space deletion from the free space tree
before flagging the block group as removed, to avoid a similar race
with adding and removing free space entries for the free space tree.

Fixes: 04216820fe83d5 ("Btrfs: fix race between fs trimming and block group remove/allocation")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agobtrfs: fix a block group ref counter leak after failure to remove block group
Filipe Manana [Mon, 1 Jun 2020 18:12:06 +0000 (19:12 +0100)]
btrfs: fix a block group ref counter leak after failure to remove block group

When removing a block group, if we fail to delete the block group's item
from the extent tree, we jump to the 'out' label and end up decrementing
the block group's reference count once only (by 1), resulting in a counter
leak because the block group at that point was already removed from the
block group cache rbtree - so we have to decrement the reference count
twice, once for the rbtree and once for our lookup at the start of the
function.

There is a second bug where if removing the free space tree entries (the
call to remove_block_group_free_space()) fails we end up jumping to the
'out_put_group' label but end up decrementing the reference count only
once, when we should have done it twice, since we have already removed
the block group from the block group cache rbtree. This happens because
the reference count decrement for the rbtree reference happens after
attempting to remove the free space tree entries, which is far away from
the place where we remove the block group from the rbtree.

To make things less error prone, decrement the reference count for the
rbtree immediately after removing the block group from it. This also
eleminates the need for two different exit labels on error, renaming
'out_put_label' to just 'out' and removing the old 'out'.

Fixes: f6033c5e333238 ("btrfs: fix block group leak when removing fails")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
4 years agoselftests/ftrace: Support ":README" suffix for requires
Masami Hiramatsu [Wed, 3 Jun 2020 02:41:09 +0000 (11:41 +0900)]
selftests/ftrace: Support ":README" suffix for requires

Add ":README" suffix support for the requires list, so that
the testcase can list up the required string for README file
to the requires list.

Note that the required string is treated as a fixed string,
instead of regular expression. Also, the testcase can specify
a string containing spaces with quotes. E.g.

# requires: "place: [<module>:]<symbol>":README

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
4 years agoselftests/ftrace: Support ":tracer" suffix for requires
Masami Hiramatsu [Wed, 3 Jun 2020 02:40:59 +0000 (11:40 +0900)]
selftests/ftrace: Support ":tracer" suffix for requires

Add ":tracer" suffix support for the requires list, so that
the testcase can list up the required tracer (e.g. function)
to the requires list.

For example, if the testcase requires function_graph tracer,
it can write requires list as below instead of checking
available_tracers.

# requires: function_graph:tracer

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
4 years agoselftests/ftrace: Convert check_filter_file() with requires list
Masami Hiramatsu [Wed, 3 Jun 2020 02:40:49 +0000 (11:40 +0900)]
selftests/ftrace: Convert check_filter_file() with requires list

Since check_filter_file() is basically checking the filter
tracefs file, we can convert it into requires list.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
4 years agoselftests/ftrace: Convert required interface checks into requires list
Masami Hiramatsu [Wed, 3 Jun 2020 02:40:38 +0000 (11:40 +0900)]
selftests/ftrace: Convert required interface checks into requires list

Convert the required tracefs interface checking code with
requires: list.

Fixed merge conflicts in trigger-hist.tc and trigger-trace-marker-hist.tc
Shuah Khan <skhan@linuxfoundation.org>

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
4 years agoblock: Fix use-after-free in blkdev_get()
Jason Yan [Tue, 16 Jun 2020 12:16:55 +0000 (20:16 +0800)]
block: Fix use-after-free in blkdev_get()

In blkdev_get() we call __blkdev_get() to do some internal jobs and if
there is some errors in __blkdev_get(), the bdput() is called which
means we have released the refcount of the bdev (actually the refcount of
the bdev inode). This means we cannot access bdev after that point. But
acctually bdev is still accessed in blkdev_get() after calling
__blkdev_get(). This results in use-after-free if the refcount is the
last one we released in __blkdev_get(). Let's take a look at the
following scenerio:

  CPU0            CPU1                    CPU2
blkdev_open     blkdev_open           Remove disk
                  bd_acquire
  blkdev_get
    __blkdev_get      del_gendisk
bdev_unhash_inode
  bd_acquire          bdev_get_gendisk
    bd_forget           failed because of unhashed
  bdput
              bdput (the last one)
        bdev_evict_inode

       access bdev => use after free

[  459.350216] BUG: KASAN: use-after-free in __lock_acquire+0x24c1/0x31b0
[  459.351190] Read of size 8 at addr ffff88806c815a80 by task syz-executor.0/20132
[  459.352347]
[  459.352594] CPU: 0 PID: 20132 Comm: syz-executor.0 Not tainted 4.19.90 #2
[  459.353628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
[  459.354947] Call Trace:
[  459.355337]  dump_stack+0x111/0x19e
[  459.355879]  ? __lock_acquire+0x24c1/0x31b0
[  459.356523]  print_address_description+0x60/0x223
[  459.357248]  ? __lock_acquire+0x24c1/0x31b0
[  459.357887]  kasan_report.cold+0xae/0x2d8
[  459.358503]  __lock_acquire+0x24c1/0x31b0
[  459.359120]  ? _raw_spin_unlock_irq+0x24/0x40
[  459.359784]  ? lockdep_hardirqs_on+0x37b/0x580
[  459.360465]  ? _raw_spin_unlock_irq+0x24/0x40
[  459.361123]  ? finish_task_switch+0x125/0x600
[  459.361812]  ? finish_task_switch+0xee/0x600
[  459.362471]  ? mark_held_locks+0xf0/0xf0
[  459.363108]  ? __schedule+0x96f/0x21d0
[  459.363716]  lock_acquire+0x111/0x320
[  459.364285]  ? blkdev_get+0xce/0xbe0
[  459.364846]  ? blkdev_get+0xce/0xbe0
[  459.365390]  __mutex_lock+0xf9/0x12a0
[  459.365948]  ? blkdev_get+0xce/0xbe0
[  459.366493]  ? bdev_evict_inode+0x1f0/0x1f0
[  459.367130]  ? blkdev_get+0xce/0xbe0
[  459.367678]  ? destroy_inode+0xbc/0x110
[  459.368261]  ? mutex_trylock+0x1a0/0x1a0
[  459.368867]  ? __blkdev_get+0x3e6/0x1280
[  459.369463]  ? bdev_disk_changed+0x1d0/0x1d0
[  459.370114]  ? blkdev_get+0xce/0xbe0
[  459.370656]  blkdev_get+0xce/0xbe0
[  459.371178]  ? find_held_lock+0x2c/0x110
[  459.371774]  ? __blkdev_get+0x1280/0x1280
[  459.372383]  ? lock_downgrade+0x680/0x680
[  459.373002]  ? lock_acquire+0x111/0x320
[  459.373587]  ? bd_acquire+0x21/0x2c0
[  459.374134]  ? do_raw_spin_unlock+0x4f/0x250
[  459.374780]  blkdev_open+0x202/0x290
[  459.375325]  do_dentry_open+0x49e/0x1050
[  459.375924]  ? blkdev_get_by_dev+0x70/0x70
[  459.376543]  ? __x64_sys_fchdir+0x1f0/0x1f0
[  459.377192]  ? inode_permission+0xbe/0x3a0
[  459.377818]  path_openat+0x148c/0x3f50
[  459.378392]  ? kmem_cache_alloc+0xd5/0x280
[  459.379016]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  459.379802]  ? path_lookupat.isra.0+0x900/0x900
[  459.380489]  ? __lock_is_held+0xad/0x140
[  459.381093]  do_filp_open+0x1a1/0x280
[  459.381654]  ? may_open_dev+0xf0/0xf0
[  459.382214]  ? find_held_lock+0x2c/0x110
[  459.382816]  ? lock_downgrade+0x680/0x680
[  459.383425]  ? __lock_is_held+0xad/0x140
[  459.384024]  ? do_raw_spin_unlock+0x4f/0x250
[  459.384668]  ? _raw_spin_unlock+0x1f/0x30
[  459.385280]  ? __alloc_fd+0x448/0x560
[  459.385841]  do_sys_open+0x3c3/0x500
[  459.386386]  ? filp_open+0x70/0x70
[  459.386911]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  459.387610]  ? trace_hardirqs_off_caller+0x55/0x1c0
[  459.388342]  ? do_syscall_64+0x1a/0x520
[  459.388930]  do_syscall_64+0xc3/0x520
[  459.389490]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  459.390248] RIP: 0033:0x416211
[  459.390720] Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83
04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f
   05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d
      01
[  459.393483] RSP: 002b:00007fe45dfe9a60 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
[  459.394610] RAX: ffffffffffffffda RBX: 00007fe45dfea6d4 RCX: 0000000000416211
[  459.395678] RDX: 00007fe45dfe9b0a RSI: 0000000000000002 RDI: 00007fe45dfe9b00
[  459.396758] RBP: 000000000076bf20 R08: 0000000000000000 R09: 000000000000000a
[  459.397930] R10: 0000000000000075 R11: 0000000000000293 R12: 00000000ffffffff
[  459.399022] R13: 0000000000000bd9 R14: 00000000004cdb80 R15: 000000000076bf2c
[  459.400168]
[  459.400430] Allocated by task 20132:
[  459.401038]  kasan_kmalloc+0xbf/0xe0
[  459.401652]  kmem_cache_alloc+0xd5/0x280
[  459.402330]  bdev_alloc_inode+0x18/0x40
[  459.402970]  alloc_inode+0x5f/0x180
[  459.403510]  iget5_locked+0x57/0xd0
[  459.404095]  bdget+0x94/0x4e0
[  459.404607]  bd_acquire+0xfa/0x2c0
[  459.405113]  blkdev_open+0x110/0x290
[  459.405702]  do_dentry_open+0x49e/0x1050
[  459.406340]  path_openat+0x148c/0x3f50
[  459.406926]  do_filp_open+0x1a1/0x280
[  459.407471]  do_sys_open+0x3c3/0x500
[  459.408010]  do_syscall_64+0xc3/0x520
[  459.408572]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  459.409415]
[  459.409679] Freed by task 1262:
[  459.410212]  __kasan_slab_free+0x129/0x170
[  459.410919]  kmem_cache_free+0xb2/0x2a0
[  459.411564]  rcu_process_callbacks+0xbb2/0x2320
[  459.412318]  __do_softirq+0x225/0x8ac

Fix this by delaying bdput() to the end of blkdev_get() which means we
have finished accessing bdev.

Fixes: 77ea887e433a ("implement in-kernel gendisk events handling")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoarm64: pgtable: Clear the GP bit for non-executable kernel pages
Will Deacon [Mon, 15 Jun 2020 15:27:43 +0000 (16:27 +0100)]
arm64: pgtable: Clear the GP bit for non-executable kernel pages

Commit cca98e9f8b5e ("mm: enforce that vmap can't map pages executable")
introduced 'pgprot_nx(prot)' for arm64 but collided silently with the
BTI support during the merge window, which endeavours to clear the GP
bit for non-executable kernel mappings in set_memory_nx().

For consistency between the two APIs, clear the GP bit in pgprot_nx().

Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20200615154642.3579-1-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoafs: afs_vnode_commit_status() doesn't need to check the RPC error
David Howells [Mon, 15 Jun 2020 23:52:30 +0000 (00:52 +0100)]
afs: afs_vnode_commit_status() doesn't need to check the RPC error

afs_vnode_commit_status() is only ever called if op->error is 0, so remove
the op->error checks from the function.

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Signed-off-by: David Howells <dhowells@redhat.com>
4 years agoafs: Fix use of afs_check_for_remote_deletion()
David Howells [Mon, 15 Jun 2020 23:34:09 +0000 (00:34 +0100)]
afs: Fix use of afs_check_for_remote_deletion()

afs_check_for_remote_deletion() checks to see if error ENOENT is returned
by the server in response to an operation and, if so, marks the primary
vnode as having been deleted as the FID is no longer valid.

However, it's being called from the operation success functions, where no
abort has happened - and if an inline abort is recorded, it's handled by
afs_vnode_commit_status().

Fix this by actually calling the operation aborted method if provided and
having that point to afs_check_for_remote_deletion().

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Signed-off-by: David Howells <dhowells@redhat.com>
4 years agoafs: Remove afs_operation::abort_code
David Howells [Mon, 15 Jun 2020 23:25:56 +0000 (00:25 +0100)]
afs: Remove afs_operation::abort_code

Remove afs_operation::abort_code as it's read but never set.  Use
ac.abort_code instead.

Signed-off-by: David Howells <dhowells@redhat.com>
4 years agoafs: Fix yfs_fs_fetch_status() to honour vnode selector
David Howells [Mon, 15 Jun 2020 23:23:12 +0000 (00:23 +0100)]
afs: Fix yfs_fs_fetch_status() to honour vnode selector

Fix yfs_fs_fetch_status() to honour the vnode selector in
op->fetch_status.which as does afs_fs_fetch_status() that allows
afs_do_lookup() to use this as an alternative to the InlineBulkStatus RPC
call if not implemented by the server.

This doesn't matter in the current code as YFS servers always implement
InlineBulkStatus, but a subsequent will call it on YFS servers too in some
circumstances.

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Signed-off-by: David Howells <dhowells@redhat.com>
4 years agoafs: Remove yfs_fs_fetch_file_status() as it's not used
David Howells [Mon, 15 Jun 2020 23:18:09 +0000 (00:18 +0100)]
afs: Remove yfs_fs_fetch_file_status() as it's not used

Remove yfs_fs_fetch_file_status() as it's no longer used.

Signed-off-by: David Howells <dhowells@redhat.com>