platform/kernel/linux-rpi.git
4 years agofloppy: check FDC index for errors before assigning it
Linus Torvalds [Fri, 21 Feb 2020 20:43:35 +0000 (12:43 -0800)]
floppy: check FDC index for errors before assigning it

Jordy Zomer reported a KASAN out-of-bounds read in the floppy driver in
wait_til_ready().

Which on the face of it can't happen, since as Willy Tarreau points out,
the function does no particular memory access.  Except through the FDCS
macro, which just indexes a static allocation through teh current fdc,
which is always checked against N_FDC.

Except the checking happens after we've already assigned the value.

The floppy driver is a disgrace (a lot of it going back to my original
horrd "design"), and has no real maintainer.  Nobody has the hardware,
and nobody really cares.  But it still gets used in virtual environment
because it's one of those things that everybody supports.

The whole thing should be re-written, or at least parts of it should be
seriously cleaned up.  The 'current fdc' index, which is used by the
FDCS macro, and which is often shadowed by a local 'fdc' variable, is a
prime example of how not to write code.

But because nobody has the hardware or the motivation, let's just fix up
the immediate problem with a nasty band-aid: test the fdc index before
actually assigning it to the static 'fdc' variable.

Reported-by: Jordy Zomer <jordy@simplyhacker.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoLinux 5.6-rc3
Linus Torvalds [Mon, 24 Feb 2020 00:17:42 +0000 (16:17 -0800)]
Linux 5.6-rc3

4 years agoMerge tag 'for-5.6-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
Linus Torvalds [Sun, 23 Feb 2020 17:43:50 +0000 (09:43 -0800)]
Merge tag 'for-5.6-rc2-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "These are fixes that were found during testing with help of error
  injection, plus some other stable material.

  There's a fixup to patch added to rc1 causing locking in wrong context
  warnings, tests found one more deadlock scenario. The patches are
  tagged for stable, two of them now in the queue but we'd like all
  three released at the same time.

  I'm not happy about fixes to fixes in such a fast succession during
  rcs, but I hope we found all the fallouts of commit 28553fa992cb
  ('Btrfs: fix race between shrinking truncate and fiemap')"

* tag 'for-5.6-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  Btrfs: fix deadlock during fast fsync when logging prealloc extents beyond eof
  Btrfs: fix btrfs_wait_ordered_range() so that it waits for all ordered extents
  btrfs: fix bytes_may_use underflow in prealloc error condtition
  btrfs: handle logged extent failure properly
  btrfs: do not check delayed items are empty for single transaction cleanup
  btrfs: reset fs_root to NULL on error in open_ctree
  btrfs: destroy qgroup extent records on transaction abort

4 years agoMerge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Feb 2020 17:42:19 +0000 (09:42 -0800)]
Merge tag 'ext4_for_linus_stable' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 fixes from Ted Ts'o:
 "More miscellaneous ext4 bug fixes (all stable fodder)"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix mount failure with quota configured as module
  jbd2: fix ocfs2 corrupt when clearing block group bits
  ext4: fix race between writepages and enabling EXT4_EXTENTS_FL
  ext4: rename s_journal_flag_rwsem to s_writepages_rwsem
  ext4: fix potential race between s_flex_groups online resizing and access
  ext4: fix potential race between s_group_info online resizing and access
  ext4: fix potential race between online resizing and write operations
  ext4: add cond_resched() to __ext4_find_entry()
  ext4: fix a data race in EXT4_I(inode)->i_disksize

4 years agoMerge tag 'csky-for-linus-5.6-rc3' of git://github.com/c-sky/csky-linux
Linus Torvalds [Sun, 23 Feb 2020 17:37:41 +0000 (09:37 -0800)]
Merge tag 'csky-for-linus-5.6-rc3' of git://github.com/c-sky/csky-linux

Pull csky updates from Guo Ren:
 "Sorry, I missed 5.6-rc1 merge window, but in this pull request the
  most are the fixes and the rests are between fixes and features. The
  only outside modification is the MAINTAINERS file update with our
  mailing list.

   - cache flush implementation fixes

   - ftrace modify panic fix

   - CONFIG_SMP boot problem fix

   - fix pt_regs saving for atomic.S

   - fix fixaddr_init without highmem.

   - fix stack protector support

   - fix fake Tightly-Coupled Memory code compile and use

   - fix some typos and coding convention"

* tag 'csky-for-linus-5.6-rc3' of git://github.com/c-sky/csky-linux: (23 commits)
  csky: Replace <linux/clk-provider.h> by <linux/of_clk.h>
  csky: Implement copy_thread_tls
  csky: Add PCI support
  csky: Minimize defconfig to support buildroot config.fragment
  csky: Add setup_initrd check code
  csky: Cleanup old Kconfig options
  arch/csky: fix some Kconfig typos
  csky: Fixup compile warning for three unimplemented syscalls
  csky: Remove unused cache implementation
  csky: Fixup ftrace modify panic
  csky: Add flush_icache_mm to defer flush icache all
  csky: Optimize abiv2 copy_to_user_page with VM_EXEC
  csky: Enable defer flush_dcache_page for abiv2 cpus (807/810/860)
  csky: Remove unnecessary flush_icache_* implementation
  csky: Support icache flush without specific instructions
  csky/Kconfig: Add Kconfig.platforms to support some drivers
  csky/smp: Fixup boot failed when CONFIG_SMP
  csky: Set regs->usp to kernel sp, when the exception is from kernel
  csky/mm: Fixup export invalid_pte_table symbol
  csky: Separate fixaddr_init from highmem
  ...

4 years agocsky: Replace <linux/clk-provider.h> by <linux/of_clk.h>
Geert Uytterhoeven [Wed, 12 Feb 2020 10:10:58 +0000 (11:10 +0100)]
csky: Replace <linux/clk-provider.h> by <linux/of_clk.h>

The C-Sky platform code is not a clock provider, and just needs to call
of_clk_init().

Hence it can include <linux/of_clk.h> instead of <linux/clk-provider.h>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agoMerge tag 'ras-urgent-2020-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Feb 2020 02:02:10 +0000 (18:02 -0800)]
Merge tag 'ras-urgent-2020-02-22' of git://git./linux/kernel/git/tip/tip

Pull RAS fixes from Thomas Gleixner:
 "Two fixes for the AMD MCE driver:

   - Populate the per CPU MCA bank descriptor pointer only after it has
     been completely set up to prevent a use-after-free in case that one
     of the subsequent initialization step fails

   - Implement a proper release function for the sysfs entries of MCA
     threshold controls instead of freeing the memory right in the CPU
     teardown code, which leads to another use-after-free when the
     associated sysfs file is opened and accessed"

* tag 'ras-urgent-2020-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce/amd: Fix kobject lifetime
  x86/mce/amd: Publish the bank pointer only after setup has succeeded

4 years agoMerge tag 'irq-urgent-2020-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Feb 2020 01:25:46 +0000 (17:25 -0800)]
Merge tag 'irq-urgent-2020-02-22' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "Two fixes for the irq core code which are follow ups to the recent MSI
  fixes:

   - The WARN_ON which was put into the MSI setaffinity callback for
     paranoia reasons actually triggered via a callchain which escaped
     when all the possible ways to reach that code were analyzed.

     The proc/irq/$N/*affinity interfaces have a quirk which came in
     when ALPHA moved to the generic interface: In case that the written
     affinity mask does not contain any online CPU it calls into ALPHAs
     magic auto affinity setting code.

     A few years later this mechanism was also made available to x86 for
     no good reasons and in a way which circumvents all sanity checks
     for interrupts which cannot have their affinity set from process
     context on X86 due to the way the X86 interrupt delivery works.

     It would be possible to make this work properly, but there is no
     point in doing so. If the interrupt is not yet started then the
     affinity setting has no effect and if it is started already then it
     is already assigned to an online CPU so there is no point to
     randomly move it to some other CPU. Just return EINVAL as the code
     has done before that change forever.

   - The new MSI quirk bit in the irq domain flags turned out to be
     already occupied, which escaped the author and the reviewers
     because the already in use bits were 0,6,2,3,4,5 listed in that
     order.

     That bit 6 was simply overlooked because the ordering was straight
     forward linear otherwise. So the new bit ended up being a
     duplicate.

     Fix it up by switching the oddball 6 to the obvious 1"

* tag 'irq-urgent-2020-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/irqdomain: Make sure all irq domain flags are distinct
  genirq/proc: Reject invalid affinity masks (again)

4 years agoMerge tag 'x86-urgent-2020-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 23 Feb 2020 01:08:16 +0000 (17:08 -0800)]
Merge tag 'x86-urgent-2020-02-22' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "Two fixes for x86:

   - Remove the __force_oder definiton from the kaslr boot code as it is
     already defined in the page table code which makes GCC 10 builds
     fail because it changed the default to -fno-common.

   - Address the AMD erratum 1054 concerning the IRPERF capability and
     enable the Instructions Retired fixed counter on machines which are
     not affected by the erratum"

* tag 'x86-urgent-2020-02-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu/amd: Enable the fixed Instructions Retired counter IRPERF
  x86/boot/compressed: Don't declare __force_order in kaslr_64.c

4 years agoMerge tag 'zonefs-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal...
Linus Torvalds [Sat, 22 Feb 2020 19:38:20 +0000 (11:38 -0800)]
Merge tag 'zonefs-5.6-rc3' of git://git./linux/kernel/git/dlemoal/zonefs

Pull zonefs fix from Damien Le Moal:
 "A single patch fixing typos in the documentation file"

* tag 'zonefs-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs:
  zonefs: fix documentation typos etc.

4 years agoMerge tag 'io_uring-5.6-2020-02-22' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 22 Feb 2020 19:12:55 +0000 (11:12 -0800)]
Merge tag 'io_uring-5.6-2020-02-22' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Here's a small collection of fixes that were queued up:

   - Remove unnecessary NULL check (Dan)

   - Missing io_req_cancelled() call in fallocate (Pavel)

   - Put the cleanup check for aux data in the right spot (Pavel)

   - Two fixes for SQPOLL (Stefano, Xiaoguang)"

* tag 'io_uring-5.6-2020-02-22' of git://git.kernel.dk/linux-block:
  io_uring: fix __io_iopoll_check deadlock in io_sq_thread
  io_uring: prevent sq_thread from spinning when it should stop
  io_uring: fix use-after-free by io_cleanup_req()
  io_uring: remove unnecessary NULL checks
  io_uring: add missing io_req_cancelled()

4 years agoMerge tag 'block-5.6-2020-02-22' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 22 Feb 2020 19:09:06 +0000 (11:09 -0800)]
Merge tag 'block-5.6-2020-02-22' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Just a set of NVMe fixes via Keith"

* tag 'block-5.6-2020-02-22' of git://git.kernel.dk/linux-block:
  nvme-multipath: Fix memory leak with ana_log_buf
  nvme: Fix uninitialized-variable warning
  nvme-pci: Use single IRQ vector for old Apple models
  nvme/pci: Add sleep quirk for Samsung and Toshiba drives

4 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 22 Feb 2020 19:00:52 +0000 (11:00 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Four non-core fixes.

  Two are reverts of target fixes which turned out to have unwanted side
  effects, one is a revert of an RDMA fix with the same problem and the
  final one fixes an incorrect warning about memory allocation failures
  in megaraid_sas (the driver actually reduces the allocation size until
  it succeeds)"

Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: Revert "target: iscsi: Wait for all commands to finish before freeing a session"
  scsi: Revert "RDMA/isert: Fix a recently introduced regression related to logout"
  scsi: megaraid_sas: silence a warning
  scsi: Revert "target/core: Inline transport_lun_remove_cmd()"

4 years agoMerge tag 'hwmon-for-v5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groec...
Linus Torvalds [Sat, 22 Feb 2020 18:52:54 +0000 (10:52 -0800)]
Merge tag 'hwmon-for-v5.6-rc3' of git://git./linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Fix crash in w83627ehf driver seen with W83627DHG-P

 - Fix lockdep splat in acpi_power_meter driver

 - Fix xdpe12284 documentation Sphinx warnings

* tag 'hwmon-for-v5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (w83627ehf) Fix crash seen with W83627DHG-P
  hwmon: (acpi_power_meter) Fix lockdep splat
  Documentation/hwmon: fix xdpe12284 Sphinx warnings

4 years agoMerge tag 'devicetree-fixes-for-5.6-2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 22 Feb 2020 18:49:59 +0000 (10:49 -0800)]
Merge tag 'devicetree-fixes-for-5.6-2' of git://git./linux/kernel/git/robh/linux

Pull devicetree fixes deom Rob Herring:
 "A handful of fixes in DT bindings for MDIO bus, Allwinner CSI, OMAP
  HSMMC, and Tegra124 EMC"

* tag 'devicetree-fixes-for-5.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  dt-bindings: media: csi: Fix clocks description
  dt-bindings: media: csi: Add interconnects properties
  dt-bindings: net: mdio: remove compatible string from example
  dt-bindings: memory-controller: Update example for Tegra124 EMC
  dt-bindings: mmc: omap-hsmmc: Fix SDIO interrupt

4 years agoMerge tag 's390-5.6-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Sat, 22 Feb 2020 18:43:41 +0000 (10:43 -0800)]
Merge tag 's390-5.6-4' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - Remove ieee_emulation_warnings sysctl which is a dead code.

 - Avoid triggering rebuild of the kernel during make install.

 - Enable protected virtualization guest support in default configs.

 - Fix cio_ignore seq_file .next function to increase position index.
   And use kobj_to_dev instead of container_of in cio code.

 - Fix storage block address lists to contain absolute addresses in qdio
   code.

 - Few clang warnings and spelling fixes.

* tag 's390-5.6-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/qdio: fill SBALEs with absolute addresses
  s390/qdio: fill SL with absolute addresses
  s390: remove obsolete ieee_emulation_warnings
  s390: make 'install' not depend on vmlinux
  s390/kaslr: Fix casts in get_random
  s390/mm: Explicitly compare PAGE_DEFAULT_KEY against zero in storage_key_init_range
  s390/pkey/zcrypt: spelling s/crytp/crypt/
  s390/cio: use kobj_to_dev() API
  s390/defconfig: enable CONFIG_PROTECTED_VIRTUALIZATION_GUEST
  s390/cio: cio_ignore_proc_seq_next should increase position index

4 years agoio_uring: fix __io_iopoll_check deadlock in io_sq_thread
Xiaoguang Wang [Sat, 22 Feb 2020 06:46:05 +0000 (14:46 +0800)]
io_uring: fix __io_iopoll_check deadlock in io_sq_thread

Since commit a3a0e43fd770 ("io_uring: don't enter poll loop if we have
CQEs pending"), if we already events pending, we won't enter poll loop.
In case SETUP_IOPOLL and SETUP_SQPOLL are both enabled, if app has
been terminated and don't reap pending events which are already in cq
ring, and there are some reqs in poll_list, io_sq_thread will enter
__io_iopoll_check(), and find pending events, then return, this loop
will never have a chance to exit.

I have seen this issue in fio stress tests, to fix this issue, let
io_sq_thread call io_iopoll_getevents() with argument 'min' being zero,
and remove __io_iopoll_check().

Fixes: a3a0e43fd770 ("io_uring: don't enter poll loop if we have CQEs pending")
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoext4: fix mount failure with quota configured as module
Jan Kara [Fri, 21 Feb 2020 10:08:35 +0000 (11:08 +0100)]
ext4: fix mount failure with quota configured as module

When CONFIG_QFMT_V2 is configured as a module, the test in
ext4_feature_set_ok() fails and so mount of filesystems with quota or
project features fails. Fix the test to use IS_ENABLED macro which
works properly even for modules.

Link: https://lore.kernel.org/r/20200221100835.9332-1-jack@suse.cz
Fixes: d65d87a07476 ("ext4: improve explanation of a mount failure caused by a misconfigured kernel")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
4 years agojbd2: fix ocfs2 corrupt when clearing block group bits
wangyan [Thu, 20 Feb 2020 13:46:14 +0000 (21:46 +0800)]
jbd2: fix ocfs2 corrupt when clearing block group bits

I found a NULL pointer dereference in ocfs2_block_group_clear_bits().
The running environment:
kernel version: 4.19
A cluster with two nodes, 5 luns mounted on two nodes, and do some
file operations like dd/fallocate/truncate/rm on every lun with storage
network disconnection.

The fallocate operation on dm-23-45 caused an null pointer dereference.

The information of NULL pointer dereference as follows:
[577992.878282] JBD2: Error -5 detected when updating journal superblock for dm-23-45.
[577992.878290] Aborting journal on device dm-23-45.
...
[577992.890778] JBD2: Error -5 detected when updating journal superblock for dm-24-46.
[577992.890908] __journal_remove_journal_head: freeing b_committed_data
[577992.890916] (fallocate,88392,52):ocfs2_extend_trans:474 ERROR: status = -30
[577992.890918] __journal_remove_journal_head: freeing b_committed_data
[577992.890920] (fallocate,88392,52):ocfs2_rotate_tree_right:2500 ERROR: status = -30
[577992.890922] __journal_remove_journal_head: freeing b_committed_data
[577992.890924] (fallocate,88392,52):ocfs2_do_insert_extent:4382 ERROR: status = -30
[577992.890928] (fallocate,88392,52):ocfs2_insert_extent:4842 ERROR: status = -30
[577992.890928] __journal_remove_journal_head: freeing b_committed_data
[577992.890930] (fallocate,88392,52):ocfs2_add_clusters_in_btree:4947 ERROR: status = -30
[577992.890933] __journal_remove_journal_head: freeing b_committed_data
[577992.890939] __journal_remove_journal_head: freeing b_committed_data
[577992.890949] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
[577992.890950] Mem abort info:
[577992.890951]   ESR = 0x96000004
[577992.890952]   Exception class = DABT (current EL), IL = 32 bits
[577992.890952]   SET = 0, FnV = 0
[577992.890953]   EA = 0, S1PTW = 0
[577992.890954] Data abort info:
[577992.890955]   ISV = 0, ISS = 0x00000004
[577992.890956]   CM = 0, WnR = 0
[577992.890958] user pgtable: 4k pages, 48-bit VAs, pgdp = 00000000f8da07a9
[577992.890960] [0000000000000020] pgd=0000000000000000
[577992.890964] Internal error: Oops: 96000004 [#1] SMP
[577992.890965] Process fallocate (pid: 88392, stack limit = 0x00000000013db2fd)
[577992.890968] CPU: 52 PID: 88392 Comm: fallocate Kdump: loaded Tainted: G        W  OE     4.19.36 #1
[577992.890969] Hardware name: Huawei TaiShan 2280 V2/BC82AMDD, BIOS 0.98 08/25/2019
[577992.890971] pstate: 60400009 (nZCv daif +PAN -UAO)
[577992.891054] pc : _ocfs2_free_suballoc_bits+0x63c/0x968 [ocfs2]
[577992.891082] lr : _ocfs2_free_suballoc_bits+0x618/0x968 [ocfs2]
[577992.891084] sp : ffff0000c8e2b810
[577992.891085] x29: ffff0000c8e2b820 x28: 0000000000000000
[577992.891087] x27: 00000000000006f3 x26: ffffa07957b02e70
[577992.891089] x25: ffff807c59d50000 x24: 00000000000006f2
[577992.891091] x23: 0000000000000001 x22: ffff807bd39abc30
[577992.891093] x21: ffff0000811d9000 x20: ffffa07535d6a000
[577992.891097] x19: ffff000001681638 x18: ffffffffffffffff
[577992.891098] x17: 0000000000000000 x16: ffff000080a03df0
[577992.891100] x15: ffff0000811d9708 x14: 203d207375746174
[577992.891101] x13: 73203a524f525245 x12: 20373439343a6565
[577992.891103] x11: 0000000000000038 x10: 0101010101010101
[577992.891106] x9 : ffffa07c68a85d70 x8 : 7f7f7f7f7f7f7f7f
[577992.891109] x7 : 0000000000000000 x6 : 0000000000000080
[577992.891110] x5 : 0000000000000000 x4 : 0000000000000002
[577992.891112] x3 : ffff000001713390 x2 : 2ff90f88b1c22f00
[577992.891114] x1 : ffff807bd39abc30 x0 : 0000000000000000
[577992.891116] Call trace:
[577992.891139]  _ocfs2_free_suballoc_bits+0x63c/0x968 [ocfs2]
[577992.891162]  _ocfs2_free_clusters+0x100/0x290 [ocfs2]
[577992.891185]  ocfs2_free_clusters+0x50/0x68 [ocfs2]
[577992.891206]  ocfs2_add_clusters_in_btree+0x198/0x5e0 [ocfs2]
[577992.891227]  ocfs2_add_inode_data+0x94/0xc8 [ocfs2]
[577992.891248]  ocfs2_extend_allocation+0x1bc/0x7a8 [ocfs2]
[577992.891269]  ocfs2_allocate_extents+0x14c/0x338 [ocfs2]
[577992.891290]  __ocfs2_change_file_space+0x3f8/0x610 [ocfs2]
[577992.891309]  ocfs2_fallocate+0xe4/0x128 [ocfs2]
[577992.891316]  vfs_fallocate+0x11c/0x250
[577992.891317]  ksys_fallocate+0x54/0x88
[577992.891319]  __arm64_sys_fallocate+0x28/0x38
[577992.891323]  el0_svc_common+0x78/0x130
[577992.891325]  el0_svc_handler+0x38/0x78
[577992.891327]  el0_svc+0x8/0xc

My analysis process as follows:
ocfs2_fallocate
  __ocfs2_change_file_space
    ocfs2_allocate_extents
      ocfs2_extend_allocation
        ocfs2_add_inode_data
          ocfs2_add_clusters_in_btree
            ocfs2_insert_extent
              ocfs2_do_insert_extent
                ocfs2_rotate_tree_right
                  ocfs2_extend_rotate_transaction
                    ocfs2_extend_trans
                      jbd2_journal_restart
                        jbd2__journal_restart
                          /* handle->h_transaction is NULL,
                           * is_handle_aborted(handle) is true
                           */
                          handle->h_transaction = NULL;
                          start_this_handle
                            return -EROFS;
            ocfs2_free_clusters
              _ocfs2_free_clusters
                _ocfs2_free_suballoc_bits
                  ocfs2_block_group_clear_bits
                    ocfs2_journal_access_gd
                      __ocfs2_journal_access
                        jbd2_journal_get_undo_access
                          /* I think jbd2_write_access_granted() will
                           * return true, because do_get_write_access()
                           * will return -EROFS.
                           */
                          if (jbd2_write_access_granted(...)) return 0;
                          do_get_write_access
                            /* handle->h_transaction is NULL, it will
                             * return -EROFS here, so do_get_write_access()
                             * was not called.
                             */
                            if (is_handle_aborted(handle)) return -EROFS;
                    /* bh2jh(group_bh) is NULL, caused NULL
                       pointer dereference */
                    undo_bg = (struct ocfs2_group_desc *)
                                bh2jh(group_bh)->b_committed_data;

If handle->h_transaction == NULL, then jbd2_write_access_granted()
does not really guarantee that journal_head will stay around,
not even speaking of its b_committed_data. The bh2jh(group_bh)
can be removed after ocfs2_journal_access_gd() and before call
"bh2jh(group_bh)->b_committed_data". So, we should move
is_handle_aborted() check from do_get_write_access() into
jbd2_journal_get_undo_access() and jbd2_journal_get_write_access()
before the call to jbd2_write_access_granted().

Link: https://lore.kernel.org/r/f72a623f-b3f1-381a-d91d-d22a1c83a336@huawei.com
Signed-off-by: Yan Wang <wangyan122@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@kernel.org
4 years agoext4: fix race between writepages and enabling EXT4_EXTENTS_FL
Eric Biggers [Wed, 19 Feb 2020 18:30:47 +0000 (10:30 -0800)]
ext4: fix race between writepages and enabling EXT4_EXTENTS_FL

If EXT4_EXTENTS_FL is set on an inode while ext4_writepages() is running
on it, the following warning in ext4_add_complete_io() can be hit:

WARNING: CPU: 1 PID: 0 at fs/ext4/page-io.c:234 ext4_put_io_end_defer+0xf0/0x120

Here's a minimal reproducer (not 100% reliable) (root isn't required):

        while true; do
                sync
        done &
        while true; do
                rm -f file
                touch file
                chattr -e file
                echo X >> file
                chattr +e file
        done

The problem is that in ext4_writepages(), ext4_should_dioread_nolock()
(which only returns true on extent-based files) is checked once to set
the number of reserved journal credits, and also again later to select
the flags for ext4_map_blocks() and copy the reserved journal handle to
ext4_io_end::handle.  But if EXT4_EXTENTS_FL is being concurrently set,
the first check can see dioread_nolock disabled while the later one can
see it enabled, causing the reserved handle to unexpectedly be NULL.

Since changing EXT4_EXTENTS_FL is uncommon, and there may be other races
related to doing so as well, fix this by synchronizing changing
EXT4_EXTENTS_FL with ext4_writepages() via the existing
s_writepages_rwsem (previously called s_journal_flag_rwsem).

This was originally reported by syzbot without a reproducer at
https://syzkaller.appspot.com/bug?extid=2202a584a00fffd19fbf,
but now that dioread_nolock is the default I also started seeing this
when running syzkaller locally.

Link: https://lore.kernel.org/r/20200219183047.47417-3-ebiggers@kernel.org
Reported-by: syzbot+2202a584a00fffd19fbf@syzkaller.appspotmail.com
Fixes: 6b523df4fb5a ("ext4: use transaction reservation for extent conversion in ext4_end_io")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@kernel.org
4 years agoext4: rename s_journal_flag_rwsem to s_writepages_rwsem
Eric Biggers [Wed, 19 Feb 2020 18:30:46 +0000 (10:30 -0800)]
ext4: rename s_journal_flag_rwsem to s_writepages_rwsem

In preparation for making s_journal_flag_rwsem synchronize
ext4_writepages() with changes to both the EXTENTS and JOURNAL_DATA
flags (rather than just JOURNAL_DATA as it does currently), rename it to
s_writepages_rwsem.

Link: https://lore.kernel.org/r/20200219183047.47417-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@kernel.org
4 years agoext4: fix potential race between s_flex_groups online resizing and access
Suraj Jitindar Singh [Wed, 19 Feb 2020 03:08:51 +0000 (19:08 -0800)]
ext4: fix potential race between s_flex_groups online resizing and access

During an online resize an array of s_flex_groups structures gets replaced
so it can get enlarged. If there is a concurrent access to the array and
this memory has been reused then this can lead to an invalid memory access.

The s_flex_group array has been converted into an array of pointers rather
than an array of structures. This is to ensure that the information
contained in the structures cannot get out of sync during a resize due to
an accessor updating the value in the old structure after it has been
copied but before the array pointer is updated. Since the structures them-
selves are no longer copied but only the pointers to them this case is
mitigated.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206443
Link: https://lore.kernel.org/r/20200221053458.730016-4-tytso@mit.edu
Signed-off-by: Suraj Jitindar Singh <surajjs@amazon.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
4 years agoMerge tag 'for-linus-5.6-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 22 Feb 2020 00:10:10 +0000 (16:10 -0800)]
Merge tag 'for-linus-5.6-rc3-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "Two small fixes for Xen:

   - a fix to avoid warnings with new gcc

   - a fix for incorrectly disabled interrupts when calling
     _cond_resched()"

* tag 'for-linus-5.6-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: Enable interrupts when calling _cond_resched()
  x86/xen: Distribute switch variables for initialization

4 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Sat, 22 Feb 2020 00:03:36 +0000 (16:03 -0800)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "It's all straightforward apart from the changes to mmap()/mremap() in
  relation to their handling of address arguments from userspace with
  non-zero tag bits in the upper byte.

  The change to brk() is necessary to fix a nasty user-visible
  regression in malloc(), but we tightened up mmap() and mremap() at the
  same time because they also allow the user to create virtual aliases
  by accident. It's much less likely than brk() to matter in practice,
  but enforcing the principle of "don't permit the creation of mappings
  using tagged addresses" leads to a straightforward ABI without having
  to worry about the "but what if a crazy program did foo?" aspect of
  things.

  Summary:

   - Fix regression in malloc() caused by ignored address tags in brk()

   - Add missing brackets around argument to untagged_addr() macro

   - Fix clang build when using binutils assembler

   - Fix silly typo in virtual memory map documentation"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  mm: Avoid creating virtual address aliases in brk()/mmap()/mremap()
  docs: arm64: fix trivial spelling enought to enough in memory.rst
  arm64: memory: Add missing brackets to untagged_addr() macro
  arm64: lse: Fix LSE atomics with LLVM

4 years agoMerge tag 'powerpc-5.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Fri, 21 Feb 2020 23:57:56 +0000 (15:57 -0800)]
Merge tag 'powerpc-5.6-3' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 5.6. This is two weeks worth as I was out
  sick last week:

   - Three fixes for the recently added VMAP_STACK on 32-bit.

   - Three fixes related to hugepages on 8xx (32-bit).

   - A fix for a bug in our transactional memory handling that could
     lead to a kernel crash if we saw a page fault during signal
     delivery.

   - A fix for a deadlock in our PCI EEH (Enhanced Error Handling) code.

   - A couple of other minor fixes.

  Thanks to: Christophe Leroy, Erhard F, Frederic Barrat, Gustavo Luiz
  Duarte, Larry Finger, Leonardo Bras, Oliver O'Halloran, Sam Bobroff"

* tag 'powerpc-5.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/entry: Fix an #if which should be an #ifdef in entry_32.S
  powerpc/xmon: Fix whitespace handling in getstring()
  powerpc/6xx: Fix power_save_ppc32_restore() with CONFIG_VMAP_STACK
  powerpc/chrp: Fix enter_rtas() with CONFIG_VMAP_STACK
  powerpc/32s: Fix DSI and ISI exceptions for CONFIG_VMAP_STACK
  powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery
  powerpc/8xx: Fix clearing of bits 20-23 in ITLB miss
  powerpc/hugetlb: Fix 8M hugepages on 8xx
  powerpc/hugetlb: Fix 512k hugepages on 8xx with 16k page size
  powerpc/eeh: Fix deadlock handling dead PHB

4 years agoMerge tag 'linux-watchdog-5.6-rc3' of git://www.linux-watchdog.org/linux-watchdog
Linus Torvalds [Fri, 21 Feb 2020 21:02:49 +0000 (13:02 -0800)]
Merge tag 'linux-watchdog-5.6-rc3' of git://linux-watchdog.org/linux-watchdog

Pull watchdog fixes from Wim Van Sebroeck:

 - mtk_wdt needs RESET_CONTROLLER to build

 - da9062 driver fixes:
     - fix power management ops
     - do not ping the hw during stop()
     - add dependency on I2C

* tag 'linux-watchdog-5.6-rc3' of git://www.linux-watchdog.org/linux-watchdog:
  watchdog: da9062: Add dependency on I2C
  watchdog: da9062: fix power management ops
  watchdog: da9062: do not ping the hw during stop()
  watchdog: fix mtk_wdt.c RESET_CONTROLLER build error

4 years agoMerge tag 'char-misc-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Fri, 21 Feb 2020 20:57:05 +0000 (12:57 -0800)]
Merge tag 'char-misc-5.6-rc3' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are some small char/misc driver fixes for 5.6-rc3.

  Also included in here are some updates for some documentation files
  that I seem to be maintaining these days.

  The driver fixes are:
   - small fixes for the habanalabs driver
   - fsi driver bugfix

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  Documentation/process: Swap out the ambassador for Canonical
  habanalabs: patched cb equals user cb in device memset
  habanalabs: do not halt CoreSight during hard reset
  habanalabs: halt the engines before hard-reset
  MAINTAINERS: remove unnecessary ':' characters
  fsi: aspeed: add unspecified HAS_IOMEM dependency
  COPYING: state that all contributions really are covered by this file
  Documentation/process: Change Microsoft contact for embargoed hardware issues
  embargoed-hardware-issues: drop Amazon contact as the email address now bounces
  Documentation/process: Add Arm contact for embargoed HW issues

4 years agoMerge tag 'staging-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Fri, 21 Feb 2020 20:53:53 +0000 (12:53 -0800)]
Merge tag 'staging-5.6-rc3' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are some small staging driver fixes for 5.6-rc3, along with the
  removal of an unused/unneeded driver as well.

  The android vsoc driver is not needed anymore by anyone, so it was
  removed.

  The other driver fixes are:
   - ashmem bugfixes
   - greybus audio driver bugfix
   - wireless driver bugfixes and tiny cleanups to error paths

  All of these have been in linux-next for a while now with no reported
  issues"

* tag 'staging-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: rtl8723bs: Remove unneeded goto statements
  staging: rtl8188eu: Remove some unneeded goto statements
  staging: rtl8723bs: Fix potential overuse of kernel memory
  staging: rtl8188eu: Fix potential overuse of kernel memory
  staging: rtl8723bs: Fix potential security hole
  staging: rtl8188eu: Fix potential security hole
  staging: greybus: use after free in gb_audio_manager_remove_all()
  staging: android: Delete the 'vsoc' driver
  staging: rtl8723bs: fix copy of overlapping memory
  staging: android: ashmem: Disallow ashmem memory from being remapped
  staging: vt6656: fix sign of rx_dbm to bb_pre_ed_rssi.

4 years agoMerge tag 'tty-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Fri, 21 Feb 2020 20:48:29 +0000 (12:48 -0800)]
Merge tag 'tty-5.6-rc3' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial driver fixes from Greg KH:
 "Here are a number of small tty and serial driver fixes for 5.6-rc3
  that resolve a bunch of reported issues.

  They are:
   - vt selection and ioctl fixes
   - serdev bugfix
   - atmel serial driver fixes
   - qcom serial driver fixes
   - other minor serial driver fixes

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  vt: selection, close sel_buffer race
  vt: selection, handle pending signals in paste_selection
  serial: cpm_uart: call cpm_muram_init before registering console
  tty: serial: qcom_geni_serial: Fix RX cancel command failure
  serial: 8250: Check UPF_IRQ_SHARED in advance
  tty: serial: imx: setup the correct sg entry for tx dma
  vt: vt_ioctl: fix race in VT_RESIZEX
  vt: fix scrollback flushing on background consoles
  tty: serial: tegra: Handle RX transfer in PIO mode if DMA wasn't started
  tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode
  serdev: ttyport: restore client ops on deregistration
  serial: ar933x_uart: set UART_CS_{RX,TX}_READY_ORIDE

4 years agoMerge tag 'usb-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Fri, 21 Feb 2020 20:44:53 +0000 (12:44 -0800)]
Merge tag 'usb-5.6-rc3' of git://git./linux/kernel/git/gregkh/usb

Pull USB/Thunderbolt fixes from Greg KH:
 "Here are a number of small USB driver fixes for 5.6-rc3.

  Included in here are:
  - MAINTAINER file updates
  - USB gadget driver fixes
  - usb core quirk additions and fixes for regressions
  - xhci driver fixes
  - usb serial driver id additions and fixes
  - thunderbolt bugfix

  Thunderbolt patches come in through here now that USB4 is really
  thunderbolt.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'usb-5.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (34 commits)
  USB: misc: iowarrior: add support for the 100 device
  thunderbolt: Prevent crash if non-active NVMem file is read
  usb: gadget: udc-xilinx: Fix xudc_stop() kernel-doc format
  USB: misc: iowarrior: add support for the 28 and 28L devices
  USB: misc: iowarrior: add support for 2 OEMed devices
  USB: Fix novation SourceControl XL after suspend
  xhci: Fix memory leak when caching protocol extended capability PSI tables - take 2
  Revert "xhci: Fix memory leak when caching protocol extended capability PSI tables"
  MAINTAINERS: Sort entries in database for THUNDERBOLT
  usb: dwc3: debug: fix string position formatting mixup with ret and len
  usb: gadget: serial: fix Tx stall after buffer overflow
  usb: gadget: ffs: ffs_aio_cancel(): Save/restore IRQ flags
  usb: dwc2: Fix SET/CLEAR_FEATURE and GET_STATUS flows
  usb: dwc2: Fix in ISOC request length checking
  usb: gadget: composite: Support more than 500mA MaxPower
  usb: gadget: composite: Fix bMaxPower for SuperSpeedPlus
  usb: gadget: u_audio: Fix high-speed max packet size
  usb: dwc3: gadget: Check for IOC/LST bit in TRB->ctrl fields
  USB: core: clean up endpoint-descriptor parsing
  USB: quirks: blacklist duplicate ep on Sound Devices USBPre2
  ...

4 years agoMerge tag 'drm-fixes-2020-02-21' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 21 Feb 2020 20:18:02 +0000 (12:18 -0800)]
Merge tag 'drm-fixes-2020-02-21' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Varied fixes for rc3.

  i915 is the largest, they are seeing some ACPI problems with their CI
  which hopefully get solved soon [1].

  msm has a bunch of fixes for new hw added in the merge, a bunch of
  amdgpu fixes, and nouveau adds support for some new firmwares for
  turing tu11x GPUs that were just released into linux-firmware by
  nvidia, they operate the same as the ones we already have for tu10x so
  should be fine to hook up.

  Otherwise it's just misc fixes for panfrost and sun4i.

  core:
   - Allow only one rotation argument, and allow zero rotation in video
     cmdline.

  i915:
   - Workaround missing Display Stream Compression (DSC) state readout
     by forcing modeset when its enabled at probe
   - Fix EHL port clock voltage level requirements
   - Fix queuing retire workers on the virtual engine
   - Fix use of partially initialized waiters
   - Stop using drm_pci_alloc/drm_pci/free
   - Fix rewind of RING_TAIL by forcing a context reload
   - Fix locking on resetting ring->head
   - Propagate our bug filing URL change to stable kernels

  panfrost:
   - Small compiler warning fix for panfrost.
   - Fix when using performance counters in panfrost when using per fd
     address space.

  sun4xi:
   - Fix dt binding

  nouveau:
   - tu11x modesetting fix
   - ACR/GR firmware support for tu11x (fw is public now)

  msm:
   - fix UBWC on GPU and display side for sc7180
   - fix DSI suspend/resume issue encountered on sc7180
   - fix some breakage on so called "linux-android" devices
      (fallout from sc7180/a618 support, not seen earlier due to
       bootloader/firmware differences)
   - couple other misc fixes

  amdgpu:
   - HDCP fixes
   - xclk fix for raven
   - GFXOFF fixes"

[1] The Intel suspend testing should now be fixed by commit 63fb9623427f
    ("ACPI: PM: s2idle: Check fixed wakeup events in acpi_s2idle_wake()")

* tag 'drm-fixes-2020-02-21' of git://anongit.freedesktop.org/drm/drm: (39 commits)
  drm/amdgpu/display: clean up hdcp workqueue handling
  drm/amdgpu: add is_raven_kicker judgement for raven1
  drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex
  drm/i915/execlists: Always force a context reload when rewinding RING_TAIL
  drm/i915: Wean off drm_pci_alloc/drm_pci_free
  drm/i915/gt: Protect defer_request() from new waiters
  drm/i915/gt: Prevent queuing retire workers on the virtual engine
  drm/i915/dsc: force full modeset whenever DSC is enabled at probe
  drm/i915/ehl: Update port clock voltage level requirements
  drm/i915: Update drm/i915 bug filing URL
  MAINTAINERS: Update drm/i915 bug filing URL
  drm/i915: Initialise basic fence before acquiring seqno
  drm/i915/gem: Require per-engine reset support for non-persistent contexts
  drm/nouveau/kms/gv100-: Re-set LUT after clearing for modesets
  drm/nouveau/gr/tu11x: initial support
  drm/nouveau/acr/tu11x: initial support
  drm/amdgpu/gfx10: disable gfxoff when reading rlc clock
  drm/amdgpu/gfx9: disable gfxoff when reading rlc clock
  drm/amdgpu/soc15: fix xclk for raven
  drm/amd/powerplay: always refetch the enabled features status on dpm enablement
  ...

4 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Linus Torvalds [Fri, 21 Feb 2020 19:59:51 +0000 (11:59 -0800)]
Merge git://git./linux/kernel/git/netdev/net

Pull networking fixes from David Miller:

 1) Limit xt_hashlimit hash table size to avoid OOM or hung tasks, from
    Cong Wang.

 2) Fix deadlock in xsk by publishing global consumer pointers when NAPI
    is finished, from Magnus Karlsson.

 3) Set table field properly to RT_TABLE_COMPAT when necessary, from
    Jethro Beekman.

 4) NLA_STRING attributes are not necessary NULL terminated, deal wiht
    that in IFLA_ALT_IFNAME. From Eric Dumazet.

 5) Fix checksum handling in atlantic driver, from Dmitry Bezrukov.

 6) Handle mtu==0 devices properly in wireguard, from Jason A.
    Donenfeld.

 7) Fix several lockdep warnings in bonding, from Taehee Yoo.

 8) Fix cls_flower port blocking, from Jason Baron.

 9) Sanitize internal map names in libbpf, from Toke Høiland-Jørgensen.

10) Fix RDMA race in qede driver, from Michal Kalderon.

11) Fix several false lockdep warnings by adding conditions to
    list_for_each_entry_rcu(), from Madhuparna Bhowmik.

12) Fix sleep in atomic in mlx5 driver, from Huy Nguyen.

13) Fix potential deadlock in bpf_map_do_batch(), from Yonghong Song.

14) Hey, variables declared in switch statement before any case
    statements are not initialized. I learn something every day. Get
    rids of this stuff in several parts of the networking, from Kees
    Cook.

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (99 commits)
  bnxt_en: Issue PCIe FLR in kdump kernel to cleanup pending DMAs.
  bnxt_en: Improve device shutdown method.
  net: netlink: cap max groups which will be considered in netlink_bind()
  net: thunderx: workaround BGX TX Underflow issue
  ionic: fix fw_status read
  net: disable BRIDGE_NETFILTER by default
  net: macb: Properly handle phylink on at91rm9200
  s390/qeth: fix off-by-one in RX copybreak check
  s390/qeth: don't warn for napi with 0 budget
  s390/qeth: vnicc Fix EOPNOTSUPP precedence
  openvswitch: Distribute switch variables for initialization
  net: ip6_gre: Distribute switch variables for initialization
  net: core: Distribute switch variables for initialization
  udp: rehash on disconnect
  net/tls: Fix to avoid gettig invalid tls record
  bpf: Fix a potential deadlock with bpf_map_do_batch
  bpf: Do not grab the bucket spinlock by default on htab batch ops
  ice: Wait for VF to be reset/ready before configuration
  ice: Don't tell the OS that link is going down
  ice: Don't reject odd values of usecs set by user
  ...

4 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 21 Feb 2020 19:40:10 +0000 (11:40 -0800)]
Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:

 - A few y2038 fixes which missed the merge window while dependencies
   in NFS were being sorted out.

 - A bunch of fixes. Some minor, some not.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  MAINTAINERS: use tabs for SAFESETID
  lib/stackdepot.c: fix global out-of-bounds in stack_slabs
  mm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM
  mm/vmscan.c: don't round up scan size for online memory cgroup
  lib/string.c: update match_string() doc-strings with correct behavior
  mm/memcontrol.c: lost css_put in memcg_expand_shrinker_maps()
  mm/swapfile.c: fix a comment in sys_swapon()
  scripts/get_maintainer.pl: deprioritize old Fixes: addresses
  get_maintainer: remove uses of P: for maintainer name
  selftests/vm: add missed tests in run_vmtests
  include/uapi/linux/swab.h: fix userspace breakage, use __BITS_PER_LONG for swap
  Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()"
  y2038: hide timeval/timespec/itimerval/itimerspec types
  y2038: remove unused time32 interfaces
  y2038: remove ktime to/from timespec/timeval conversion

4 years agoMAINTAINERS: use tabs for SAFESETID
Randy Dunlap [Fri, 21 Feb 2020 04:04:33 +0000 (20:04 -0800)]
MAINTAINERS: use tabs for SAFESETID

Use tabs for indentation instead of spaces for SAFESETID.  All (!) other
entries in MAINTAINERS use tabs (according to my simple grepping).

Link: http://lkml.kernel.org/r/2bb2e52a-2694-816d-57b4-6cabfadd6c1a@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Micah Morton <mortonm@chromium.org>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agolib/stackdepot.c: fix global out-of-bounds in stack_slabs
Alexander Potapenko [Fri, 21 Feb 2020 04:04:30 +0000 (20:04 -0800)]
lib/stackdepot.c: fix global out-of-bounds in stack_slabs

Walter Wu has reported a potential case in which init_stack_slab() is
called after stack_slabs[STACK_ALLOC_MAX_SLABS - 1] has already been
initialized.  In that case init_stack_slab() will overwrite
stack_slabs[STACK_ALLOC_MAX_SLABS], which may result in a memory
corruption.

Link: http://lkml.kernel.org/r/20200218102950.260263-1-glider@google.com
Fixes: cd11016e5f521 ("mm, kasan: stackdepot implementation. Enable stackdepot for SLAB")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reported-by: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM
Wei Yang [Fri, 21 Feb 2020 04:04:27 +0000 (20:04 -0800)]
mm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM

When we use SPARSEMEM instead of SPARSEMEM_VMEMMAP, pfn_to_page()
doesn't work before sparse_init_one_section() is called.

This leads to a crash when hotplug memory:

    BUG: unable to handle page fault for address: 0000000006400000
    #PF: supervisor write access in kernel mode
    #PF: error_code(0x0002) - not-present page
    PGD 0 P4D 0
    Oops: 0002 [#1] SMP PTI
    CPU: 3 PID: 221 Comm: kworker/u16:1 Tainted: G        W         5.5.0-next-20200205+ #343
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
    Workqueue: kacpi_hotplug acpi_hotplug_work_fn
    RIP: 0010:__memset+0x24/0x30
    Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 <f3> 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3
    RSP: 0018:ffffb43ac0373c80 EFLAGS: 00010a87
    RAX: ffffffffffffffff RBX: ffff8a1518800000 RCX: 0000000000050000
    RDX: 0000000000000000 RSI: 00000000000000ff RDI: 0000000006400000
    RBP: 0000000000140000 R08: 0000000000100000 R09: 0000000006400000
    R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
    R13: 0000000000000028 R14: 0000000000000000 R15: ffff8a153ffd9280
    FS:  0000000000000000(0000) GS:ffff8a153ab00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000006400000 CR3: 0000000136fca000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     sparse_add_section+0x1c9/0x26a
     __add_pages+0xbf/0x150
     add_pages+0x12/0x60
     add_memory_resource+0xc8/0x210
     __add_memory+0x62/0xb0
     acpi_memory_device_add+0x13f/0x300
     acpi_bus_attach+0xf6/0x200
     acpi_bus_scan+0x43/0x90
     acpi_device_hotplug+0x275/0x3d0
     acpi_hotplug_work_fn+0x1a/0x30
     process_one_work+0x1a7/0x370
     worker_thread+0x30/0x380
     kthread+0x112/0x130
     ret_from_fork+0x35/0x40

We should use memmap as it did.

On x86 the impact is limited to x86_32 builds, or x86_64 configurations
that override the default setting for SPARSEMEM_VMEMMAP.

Other memory hotplug archs (arm64, ia64, and ppc) also default to
SPARSEMEM_VMEMMAP=y.

[dan.j.williams@intel.com: changelog update]
{rppt@linux.ibm.com: changelog update]
Link: http://lkml.kernel.org/r/20200219030454.4844-1-bhe@redhat.com
Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/vmscan.c: don't round up scan size for online memory cgroup
Gavin Shan [Fri, 21 Feb 2020 04:04:24 +0000 (20:04 -0800)]
mm/vmscan.c: don't round up scan size for online memory cgroup

Commit 68600f623d69 ("mm: don't miss the last page because of round-off
error") makes the scan size round up to @denominator regardless of the
memory cgroup's state, online or offline.  This affects the overall
reclaiming behavior: the corresponding LRU list is eligible for
reclaiming only when its size logically right shifted by @sc->priority
is bigger than zero in the former formula.

For example, the inactive anonymous LRU list should have at least 0x4000
pages to be eligible for reclaiming when we have 60/12 for
swappiness/priority and without taking scan/rotation ratio into account.

After the roundup is applied, the inactive anonymous LRU list becomes
eligible for reclaiming when its size is bigger than or equal to 0x1000
in the same condition.

    (0x4000 >> 12) * 60 / (60 + 140 + 1) = 1
    ((0x1000 >> 12) * 60) + 200) / (60 + 140 + 1) = 1

aarch64 has 512MB huge page size when the base page size is 64KB.  The
memory cgroup that has a huge page is always eligible for reclaiming in
that case.

The reclaiming is likely to stop after the huge page is reclaimed,
meaing the further iteration on @sc->priority and the silbing and child
memory cgroups will be skipped.  The overall behaviour has been changed.
This fixes the issue by applying the roundup to offlined memory cgroups
only, to give more preference to reclaim memory from offlined memory
cgroup.  It sounds reasonable as those memory is unlikedly to be used by
anyone.

The issue was found by starting up 8 VMs on a Ampere Mustang machine,
which has 8 CPUs and 16 GB memory.  Each VM is given with 2 vCPUs and
2GB memory.  It took 264 seconds for all VMs to be completely up and
784MB swap is consumed after that.  With this patch applied, it took 236
seconds and 60MB swap to do same thing.  So there is 10% performance
improvement for my case.  Note that KSM is disable while THP is enabled
in the testing.

         total     used    free   shared  buff/cache   available
   Mem:  16196    10065    2049       16        4081        3749
   Swap:  8175      784    7391
         total     used    free   shared  buff/cache   available
   Mem:  16196    11324    3656       24        1215        2936
   Swap:  8175       60    8115

Link: http://lkml.kernel.org/r/20200211024514.8730-1-gshan@redhat.com
Fixes: 68600f623d69 ("mm: don't miss the last page because of round-off error")
Signed-off-by: Gavin Shan <gshan@redhat.com>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: <stable@vger.kernel.org> [4.20+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agolib/string.c: update match_string() doc-strings with correct behavior
Alexandru Ardelean [Fri, 21 Feb 2020 04:04:21 +0000 (20:04 -0800)]
lib/string.c: update match_string() doc-strings with correct behavior

There were a few attempts at changing behavior of the match_string()
helpers (i.e.  'match_string()' & 'sysfs_match_string()'), to change &
extend the behavior according to the doc-string.

But the simplest approach is to just fix the doc-strings.  The current
behavior is fine as-is, and some bugs were introduced trying to fix it.

As for extending the behavior, new helpers can always be introduced if
needed.

The match_string() helpers behave more like 'strncmp()' in the sense
that they go up to n elements or until the first NULL element in the
array of strings.

This change updates the doc-strings with this info.

Link: http://lkml.kernel.org/r/20200213072722.8249-1-alexandru.ardelean@analog.com
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: "Tobin C . Harding" <tobin@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/memcontrol.c: lost css_put in memcg_expand_shrinker_maps()
Vasily Averin [Fri, 21 Feb 2020 04:04:18 +0000 (20:04 -0800)]
mm/memcontrol.c: lost css_put in memcg_expand_shrinker_maps()

for_each_mem_cgroup() increases css reference counter for memory cgroup
and requires to use mem_cgroup_iter_break() if the walk is cancelled.

Link: http://lkml.kernel.org/r/c98414fb-7e1f-da0f-867a-9340ec4bd30b@virtuozzo.com
Fixes: 0a4465d34028 ("mm, memcg: assign memcg-aware shrinkers bitmap to memcg")
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomm/swapfile.c: fix a comment in sys_swapon()
Christoph Hellwig [Fri, 21 Feb 2020 04:04:15 +0000 (20:04 -0800)]
mm/swapfile.c: fix a comment in sys_swapon()

claim_swapfile now always takes i_rwsem.

Link: http://lkml.kernel.org/r/20200114161225.309792-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoscripts/get_maintainer.pl: deprioritize old Fixes: addresses
Douglas Anderson [Fri, 21 Feb 2020 04:04:12 +0000 (20:04 -0800)]
scripts/get_maintainer.pl: deprioritize old Fixes: addresses

Recently, I found that get_maintainer was causing me to send emails to
the old addresses for maintainers.  Since I usually just trust the
output of get_maintainer to know the right email address, I didn't even
look carefully and fired off two patch series that went to the wrong
place.  Oops.

The problem was introduced recently when trying to add signatures from
Fixes.  The problem was that these email addresses were added too early
in the process of compiling our list of places to send.  Things added to
the list earlier are considered more canonical and when we later added
maintainer entries we ended up deduplicating to the old address.

Here are two examples using mainline commits (to make it easier to
replicate) for the two maintainers that I messed up recently:

  $ git format-patch d8549bcd0529~..d8549bcd0529
  $ ./scripts/get_maintainer.pl 0001-clk-Add-clk_hw*.patch | grep Boyd
  Stephen Boyd <sboyd@codeaurora.org>...

  $ git format-patch 6d1238aa3395~..6d1238aa3395
  $ ./scripts/get_maintainer.pl 0001-arm64-dts-qcom-qcs404*.patch | grep Andy
  Andy Gross <andy.gross@linaro.org>

Let's move the adding of addresses from Fixes: to the end since the
email addresses from these are much more likely to be older.

After this patch the above examples get the right addresses for the two
examples.

Link: http://lkml.kernel.org/r/20200127095001.1.I41fba9f33590bfd92cd01960161d8384268c6569@changeid
Fixes: 2f5bd343694e ("scripts/get_maintainer.pl: add signatures from Fixes: <badcommit> lines in commit message")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoget_maintainer: remove uses of P: for maintainer name
Joe Perches [Fri, 21 Feb 2020 04:04:09 +0000 (20:04 -0800)]
get_maintainer: remove uses of P: for maintainer name

Commit 1ca84ed6425f ("MAINTAINERS: Reclaim the P: tag for Maintainer
Entry Profile") changed the use of the "P:" tag from "Person" to
"Profile (ie: special subsystem coding styles and characteristics)"

Change how get_maintainer.pl parses the "P:" tag to match.

Link: http://lkml.kernel.org/r/ca53823fc5d25c0be32ad937d0207a0589c08643.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Dan Williams <dan.j.william@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoselftests/vm: add missed tests in run_vmtests
SeongJae Park [Fri, 21 Feb 2020 04:04:06 +0000 (20:04 -0800)]
selftests/vm: add missed tests in run_vmtests

The commits introducing 'mlock-random-test'[1], 'map_fiex_noreplace'[2],
and 'thuge-gen'[3] have not added those in the 'run_vmtests' script and
thus the 'run_tests' command of kselftests doesn't run those.  This
commit adds those in the script.

'gup_benchmark' and 'transhuge-stress' are also not included in the
'run_vmtests', but this commit does not add those because those are for
performance measurement rather than pass/fail tests.

[1] commit 26b4224d9961 ("selftests: expanding more mlock selftest")
[2] commit 91cbacc34512 ("tools/testing/selftests/vm/map_fixed_noreplace.c: add test for MAP_FIXED_NOREPLACE")
[3] commit fcc1f2d5dd34 ("selftests: add a test program for variable huge page sizes in mmap/shmget")

Link: http://lkml.kernel.org/r/20200206085144.29126-1-sj38.park@gmail.com
Signed-off-by: SeongJae Park <sjpark@amazon.de>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoinclude/uapi/linux/swab.h: fix userspace breakage, use __BITS_PER_LONG for swap
Christian Borntraeger [Fri, 21 Feb 2020 04:04:03 +0000 (20:04 -0800)]
include/uapi/linux/swab.h: fix userspace breakage, use __BITS_PER_LONG for swap

QEMU has a funny new build error message when I use the upstream kernel
headers:

      CC      block/file-posix.o
    In file included from /home/cborntra/REPOS/qemu/include/qemu/timer.h:4,
                     from /home/cborntra/REPOS/qemu/include/qemu/timed-average.h:29,
                     from /home/cborntra/REPOS/qemu/include/block/accounting.h:28,
                     from /home/cborntra/REPOS/qemu/include/block/block_int.h:27,
                     from /home/cborntra/REPOS/qemu/block/file-posix.c:30:
    /usr/include/linux/swab.h: In function `__swab':
    /home/cborntra/REPOS/qemu/include/qemu/bitops.h:20:34: error: "sizeof" is not defined, evaluates to 0 [-Werror=undef]
       20 | #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
          |                                  ^~~~~~
    /home/cborntra/REPOS/qemu/include/qemu/bitops.h:20:41: error: missing binary operator before token "("
       20 | #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
          |                                         ^
    cc1: all warnings being treated as errors
    make: *** [/home/cborntra/REPOS/qemu/rules.mak:69: block/file-posix.o] Error 1
    rm tests/qemu-iotests/socket_scm_helper.o

This was triggered by commit d5767057c9a ("uapi: rename ext2_swab() to
swab() and share globally in swab.h").  That patch is doing

  #include <asm/bitsperlong.h>

but it uses BITS_PER_LONG.

The kernel file asm/bitsperlong.h provide only __BITS_PER_LONG.

Let us use the __ variant in swap.h

Link: http://lkml.kernel.org/r/20200213142147.17604-1-borntraeger@de.ibm.com
Fixes: d5767057c9a ("uapi: rename ext2_swab() to swab() and share globally in swab.h")
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Yury Norov <yury.norov@gmail.com>
Cc: Allison Randal <allison@lohutok.net>
Cc: Joe Perches <joe@perches.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: Torsten Hilbrich <torsten.hilbrich@secunet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoRevert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()"
Ioanna Alifieraki [Fri, 21 Feb 2020 04:04:00 +0000 (20:04 -0800)]
Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()"

This reverts commit a97955844807e327df11aa33869009d14d6b7de0.

Commit a97955844807 ("ipc,sem: remove uneeded sem_undo_list lock usage
in exit_sem()") removes a lock that is needed.  This leads to a process
looping infinitely in exit_sem() and can also lead to a crash.  There is
a reproducer available in [1] and with the commit reverted the issue
does not reproduce anymore.

Using the reproducer found in [1] is fairly easy to reach a point where
one of the child processes is looping infinitely in exit_sem between
for(;;) and if (semid == -1) block, while it's trying to free its last
sem_undo structure which has already been freed by freeary().

Each sem_undo struct is on two lists: one per semaphore set (list_id)
and one per process (list_proc).  The list_id list tracks undos by
semaphore set, and the list_proc by process.

Undo structures are removed either by freeary() or by exit_sem().  The
freeary function is invoked when the user invokes a syscall to remove a
semaphore set.  During this operation freeary() traverses the list_id
associated with the semaphore set and removes the undo structures from
both the list_id and list_proc lists.

For this case, exit_sem() is called at process exit.  Each process
contains a struct sem_undo_list (referred to as "ulp") which contains
the head for the list_proc list.  When the process exits, exit_sem()
traverses this list to remove each sem_undo struct.  As in freeary(),
whenever a sem_undo struct is removed from list_proc, it is also removed
from the list_id list.

Removing elements from list_id is safe for both exit_sem() and freeary()
due to sem_lock().  Removing elements from list_proc is not safe;
freeary() locks &un->ulp->lock when it performs
list_del_rcu(&un->list_proc) but exit_sem() does not (locking was
removed by commit a97955844807 ("ipc,sem: remove uneeded sem_undo_list
lock usage in exit_sem()").

This can result in the following situation while executing the
reproducer [1] : Consider a child process in exit_sem() and the parent
in freeary() (because of semctl(sid[i], NSEM, IPC_RMID)).

 - The list_proc for the child contains the last two undo structs A and
   B (the rest have been removed either by exit_sem() or freeary()).

 - The semid for A is 1 and semid for B is 2.

 - exit_sem() removes A and at the same time freeary() removes B.

 - Since A and B have different semid sem_lock() will acquire different
   locks for each process and both can proceed.

The bug is that they remove A and B from the same list_proc at the same
time because only freeary() acquires the ulp lock. When exit_sem()
removes A it makes ulp->list_proc.next to point at B and at the same
time freeary() removes B setting B->semid=-1.

At the next iteration of for(;;) loop exit_sem() will try to remove B.

The only way to break from for(;;) is for (&un->list_proc ==
&ulp->list_proc) to be true which is not. Then exit_sem() will check if
B->semid=-1 which is and will continue looping in for(;;) until the
memory for B is reallocated and the value at B->semid is changed.

At that point, exit_sem() will crash attempting to unlink B from the
lists (this can be easily triggered by running the reproducer [1] a
second time).

To prove this scenario instrumentation was added to keep information
about each sem_undo (un) struct that is removed per process and per
semaphore set (sma).

          CPU0                                CPU1
  [caller holds sem_lock(sma for A)]      ...
  freeary()                               exit_sem()
  ...                                     ...
  ...                                     sem_lock(sma for B)
  spin_lock(A->ulp->lock)                 ...
  list_del_rcu(un_A->list_proc)           list_del_rcu(un_B->list_proc)

Undo structures A and B have different semid and sem_lock() operations
proceed.  However they belong to the same list_proc list and they are
removed at the same time.  This results into ulp->list_proc.next
pointing to the address of B which is already removed.

After reverting commit a97955844807 ("ipc,sem: remove uneeded
sem_undo_list lock usage in exit_sem()") the issue was no longer
reproducible.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1694779

Link: http://lkml.kernel.org/r/20191211191318.11860-1-ioanna-maria.alifieraki@canonical.com
Fixes: a97955844807 ("ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()")
Signed-off-by: Ioanna Alifieraki <ioanna-maria.alifieraki@canonical.com>
Acked-by: Manfred Spraul <manfred@colorfullife.com>
Acked-by: Herton R. Krzesinski <herton@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: <malat@debian.org>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jay Vosburgh <jay.vosburgh@canonical.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoy2038: hide timeval/timespec/itimerval/itimerspec types
Arnd Bergmann [Fri, 21 Feb 2020 04:03:57 +0000 (20:03 -0800)]
y2038: hide timeval/timespec/itimerval/itimerspec types

There are no in-kernel users remaining, but there may still be users that
include linux/time.h instead of sys/time.h from user space, so leave the
types available to user space while hiding them from kernel space.

Only the __kernel_old_* versions of these types remain now.

Link: http://lkml.kernel.org/r/20200110154232.4104492-4-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoy2038: remove unused time32 interfaces
Arnd Bergmann [Fri, 21 Feb 2020 04:03:54 +0000 (20:03 -0800)]
y2038: remove unused time32 interfaces

No users remain, so kill these off before we grow new ones.

Link: http://lkml.kernel.org/r/20200110154232.4104492-3-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoy2038: remove ktime to/from timespec/timeval conversion
Arnd Bergmann [Fri, 21 Feb 2020 04:03:50 +0000 (20:03 -0800)]
y2038: remove ktime to/from timespec/timeval conversion

A couple of helpers are now obsolete and can be removed, so drivers can no
longer start using them and instead use y2038-safe interfaces.

Link: http://lkml.kernel.org/r/20200110154232.4104492-2-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoACPI: PM: s2idle: Check fixed wakeup events in acpi_s2idle_wake()
Rafael J. Wysocki [Fri, 21 Feb 2020 00:46:18 +0000 (01:46 +0100)]
ACPI: PM: s2idle: Check fixed wakeup events in acpi_s2idle_wake()

Commit fdde0ff8590b ("ACPI: PM: s2idle: Prevent spurious SCIs from
waking up the system") overlooked the fact that fixed events can wake
up the system too and broke RTC wakeup from suspend-to-idle as a
result.

Fix this issue by checking the fixed events in acpi_s2idle_wake() in
addition to checking wakeup GPEs and break out of the suspend-to-idle
loop if the status bits of any enabled fixed events are set then.

Fixes: fdde0ff8590b ("ACPI: PM: s2idle: Prevent spurious SCIs from waking up the system")
Reported-and-tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agohwmon: (w83627ehf) Fix crash seen with W83627DHG-P
Guenter Roeck [Thu, 20 Feb 2020 14:29:48 +0000 (06:29 -0800)]
hwmon: (w83627ehf) Fix crash seen with W83627DHG-P

Loading the driver on a system with W83627DHG-P crashes as follows.

w83627ehf: Found W83627DHG-P chip at 0x290
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 604 Comm: sensors Not tainted 5.6.0-rc2-00055-gca7e1fd1026c #29
Hardware name:  /D425KT, BIOS MWPNT10N.86A.0132.2013.0726.1534 07/26/2013
RIP: 0010:w83627ehf_read_string+0x27/0x70 [w83627ehf]
Code: [... ]
RSP: 0018:ffffb95980657df8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff96caaa7f5218 RCX: 0000000000000000
RDX: 0000000000000015 RSI: 0000000000000001 RDI: ffff96caa736ec08
RBP: 0000000000000000 R08: ffffb95980657e20 R09: 0000000000000001
R10: ffff96caaa635cc0 R11: 0000000000000000 R12: ffff96caa9f7cf00
R13: ffff96caa9ec3d00 R14: ffff96caa9ec3d28 R15: ffff96caa9ec3d40
FS:  00007fbc7c4e2740(0000) GS:ffff96caabc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000129d58000 CR4: 00000000000006f0
Call Trace:
 ? cp_new_stat+0x12d/0x160
 hwmon_attr_show_string+0x37/0x70 [hwmon]
 dev_attr_show+0x14/0x50
 sysfs_kf_seq_show+0xb5/0x1b0
 seq_read+0xcf/0x460
 vfs_read+0x9b/0x150
 ksys_read+0x5f/0xe0
 do_syscall_64+0x48/0x190
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
...

Temperature labels are not always present. Adjust sysfs attribute
visibility accordingly.

Reported-by: Meelis Roos <mroos@linux.ee>
Suggested-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Fixes: 266cd5835947 ("hwmon: (w83627ehf) convert to with_info interface")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
4 years agoMerge branch 'nvme-5.6-rc3' of git://git.infradead.org/nvme into block-5.6
Jens Axboe [Fri, 21 Feb 2020 16:18:00 +0000 (09:18 -0700)]
Merge branch 'nvme-5.6-rc3' of git://git.infradead.org/nvme into block-5.6

Pull NVMe fixes from Keith.

* 'nvme-5.6-rc3' of git://git.infradead.org/nvme:
  nvme-multipath: Fix memory leak with ana_log_buf
  nvme: Fix uninitialized-variable warning
  nvme-pci: Use single IRQ vector for old Apple models
  nvme/pci: Add sleep quirk for Samsung and Toshiba drives

4 years agoio_uring: prevent sq_thread from spinning when it should stop
Stefano Garzarella [Fri, 21 Feb 2020 15:42:16 +0000 (16:42 +0100)]
io_uring: prevent sq_thread from spinning when it should stop

This patch drops 'cur_mm' before calling cond_resched(), to prevent
the sq_thread from spinning even when the user process is finished.

Before this patch, if the user process ended without closing the
io_uring fd, the sq_thread continues to spin until the
'sq_thread_idle' timeout ends.

In the worst case where the 'sq_thread_idle' parameter is bigger than
INT_MAX, the sq_thread will spin forever.

Fixes: 6c271ce2f1d5 ("io_uring: add submission polling")
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoBtrfs: fix deadlock during fast fsync when logging prealloc extents beyond eof
Filipe Manana [Thu, 20 Feb 2020 13:29:49 +0000 (13:29 +0000)]
Btrfs: fix deadlock during fast fsync when logging prealloc extents beyond eof

While logging the prealloc extents of an inode during a fast fsync we call
btrfs_truncate_inode_items(), through btrfs_log_prealloc_extents(), while
holding a read lock on a leaf of the inode's root (not the log root, the
fs/subvol root), and then that function locks the file range in the inode's
iotree. This can lead to a deadlock when:

* the fsync is ranged

* the file has prealloc extents beyond eof

* writeback for a range different from the fsync range starts
  during the fsync

* the size of the file is not sector size aligned

Because when finishing an ordered extent we lock first a file range and
then try to COW the fs/subvol tree to insert an extent item.

The following diagram shows how the deadlock can happen.

           CPU 1                                        CPU 2

  btrfs_sync_file()
    --> for range [0, 1MiB)

    --> inode has a size of
        1MiB and has 1 prealloc
        extent beyond the
        i_size, starting at offset
        4MiB

    flushes all delalloc for the
    range [0MiB, 1MiB) and waits
    for the respective ordered
    extents to complete

                                              --> before task at CPU 1 locks the
                                                  inode, a write into file range
                                                  [1MiB, 2MiB + 1KiB) is made

                                              --> i_size is updated to 2MiB + 1KiB

                                              --> writeback is started for that
                                                  range, [1MiB, 2MiB + 4KiB)
                                                  --> end offset rounded up to
                                                      be sector size aligned

    btrfs_log_dentry_safe()
      btrfs_log_inode_parent()
        btrfs_log_inode()

          btrfs_log_changed_extents()
            btrfs_log_prealloc_extents()
              --> does a search on the
                  inode's root
              --> holds a read lock on
                  leaf X

                                              btrfs_finish_ordered_io()
                                                --> locks range [1MiB, 2MiB + 4KiB)
                                                    --> end offset rounded up
                                                        to be sector size aligned

                                                --> tries to cow leaf X, through
                                                    insert_reserved_file_extent()
                                                    --> already locked by the
                                                        task at CPU 1

              btrfs_truncate_inode_items()

                --> gets an i_size of
                    2MiB + 1KiB, which is
                    not sector size
                    aligned

                --> tries to lock file
                    range [2MiB, (u64)-1)
                    --> the start range
                        is rounded down
                        from 2MiB + 1K
                        to 2MiB to be sector
                        size aligned

                    --> but the subrange
                        [2MiB, 2MiB + 4KiB) is
                        already locked by
                        task at CPU 2 which
                        is waiting to get a
                        write lock on leaf X
                        for which we are
                        holding a read lock

                                *** deadlock ***

This results in a stack trace like the following, triggered by test case
generic/561 from fstests:

  [ 2779.973608] INFO: task kworker/u8:6:247 blocked for more than 120 seconds.
  [ 2779.979536]       Not tainted 5.6.0-rc2-btrfs-next-53 #1
  [ 2779.984503] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 2779.990136] kworker/u8:6    D    0   247      2 0x80004000
  [ 2779.990457] Workqueue: btrfs-endio-write btrfs_work_helper [btrfs]
  [ 2779.990466] Call Trace:
  [ 2779.990491]  ? __schedule+0x384/0xa30
  [ 2779.990521]  schedule+0x33/0xe0
  [ 2779.990616]  btrfs_tree_read_lock+0x19e/0x2e0 [btrfs]
  [ 2779.990632]  ? remove_wait_queue+0x60/0x60
  [ 2779.990730]  btrfs_read_lock_root_node+0x2f/0x40 [btrfs]
  [ 2779.990782]  btrfs_search_slot+0x510/0x1000 [btrfs]
  [ 2779.990869]  btrfs_lookup_file_extent+0x4a/0x70 [btrfs]
  [ 2779.990944]  __btrfs_drop_extents+0x161/0x1060 [btrfs]
  [ 2779.990987]  ? mark_held_locks+0x6d/0xc0
  [ 2779.990994]  ? __slab_alloc.isra.49+0x99/0x100
  [ 2779.991060]  ? insert_reserved_file_extent.constprop.19+0x64/0x300 [btrfs]
  [ 2779.991145]  insert_reserved_file_extent.constprop.19+0x97/0x300 [btrfs]
  [ 2779.991222]  ? start_transaction+0xdd/0x5c0 [btrfs]
  [ 2779.991291]  btrfs_finish_ordered_io+0x4f4/0x840 [btrfs]
  [ 2779.991405]  btrfs_work_helper+0xaa/0x720 [btrfs]
  [ 2779.991432]  process_one_work+0x26d/0x6a0
  [ 2779.991460]  worker_thread+0x4f/0x3e0
  [ 2779.991481]  ? process_one_work+0x6a0/0x6a0
  [ 2779.991489]  kthread+0x103/0x140
  [ 2779.991499]  ? kthread_create_worker_on_cpu+0x70/0x70
  [ 2779.991515]  ret_from_fork+0x3a/0x50
  (...)
  [ 2780.026211] INFO: task fsstress:17375 blocked for more than 120 seconds.
  [ 2780.027480]       Not tainted 5.6.0-rc2-btrfs-next-53 #1
  [ 2780.028482] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 2780.030035] fsstress        D    0 17375  17373 0x00004000
  [ 2780.030038] Call Trace:
  [ 2780.030044]  ? __schedule+0x384/0xa30
  [ 2780.030052]  schedule+0x33/0xe0
  [ 2780.030075]  lock_extent_bits+0x20c/0x320 [btrfs]
  [ 2780.030094]  ? btrfs_truncate_inode_items+0xf4/0x1150 [btrfs]
  [ 2780.030098]  ? rcu_read_lock_sched_held+0x59/0xa0
  [ 2780.030102]  ? remove_wait_queue+0x60/0x60
  [ 2780.030122]  btrfs_truncate_inode_items+0x133/0x1150 [btrfs]
  [ 2780.030151]  ? btrfs_set_path_blocking+0xb2/0x160 [btrfs]
  [ 2780.030165]  ? btrfs_search_slot+0x379/0x1000 [btrfs]
  [ 2780.030195]  btrfs_log_changed_extents.isra.8+0x841/0x93e [btrfs]
  [ 2780.030202]  ? do_raw_spin_unlock+0x49/0xc0
  [ 2780.030215]  ? btrfs_get_num_csums+0x10/0x10 [btrfs]
  [ 2780.030239]  btrfs_log_inode+0xf83/0x1124 [btrfs]
  [ 2780.030251]  ? __mutex_unlock_slowpath+0x45/0x2a0
  [ 2780.030275]  btrfs_log_inode_parent+0x2a0/0xe40 [btrfs]
  [ 2780.030282]  ? dget_parent+0xa1/0x370
  [ 2780.030309]  btrfs_log_dentry_safe+0x4a/0x70 [btrfs]
  [ 2780.030329]  btrfs_sync_file+0x3f3/0x490 [btrfs]
  [ 2780.030339]  do_fsync+0x38/0x60
  [ 2780.030343]  __x64_sys_fdatasync+0x13/0x20
  [ 2780.030345]  do_syscall_64+0x5c/0x280
  [ 2780.030348]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
  [ 2780.030356] RIP: 0033:0x7f2d80f6d5f0
  [ 2780.030361] Code: Bad RIP value.
  [ 2780.030362] RSP: 002b:00007ffdba3c8548 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
  [ 2780.030364] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2d80f6d5f0
  [ 2780.030365] RDX: 00007ffdba3c84b0 RSI: 00007ffdba3c84b0 RDI: 0000000000000003
  [ 2780.030367] RBP: 000000000000004a R08: 0000000000000001 R09: 00007ffdba3c855c
  [ 2780.030368] R10: 0000000000000078 R11: 0000000000000246 R12: 00000000000001f4
  [ 2780.030369] R13: 0000000051eb851f R14: 00007ffdba3c85f0 R15: 0000557a49220d90

So fix this by making btrfs_truncate_inode_items() not lock the range in
the inode's iotree when the target root is a log root, since it's not
needed to lock the range for log roots as the protection from the inode's
lock and log_mutex are all that's needed.

Fixes: 28553fa992cb28 ("Btrfs: fix race between shrinking truncate and fiemap")
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 agonvme-multipath: Fix memory leak with ana_log_buf
Logan Gunthorpe [Thu, 20 Feb 2020 20:29:53 +0000 (13:29 -0700)]
nvme-multipath: Fix memory leak with ana_log_buf

kmemleak reports a memory leak with the ana_log_buf allocated by
nvme_mpath_init():

unreferenced object 0xffff888120e94000 (size 8208):
  comm "nvme", pid 6884, jiffies 4295020435 (age 78786.312s)
    hex dump (first 32 bytes):
      00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
      01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
    backtrace:
      [<00000000e2360188>] kmalloc_order+0x97/0xc0
      [<0000000079b18dd4>] kmalloc_order_trace+0x24/0x100
      [<00000000f50c0406>] __kmalloc+0x24c/0x2d0
      [<00000000f31a10b9>] nvme_mpath_init+0x23c/0x2b0
      [<000000005802589e>] nvme_init_identify+0x75f/0x1600
      [<0000000058ef911b>] nvme_loop_configure_admin_queue+0x26d/0x280
      [<00000000673774b9>] nvme_loop_create_ctrl+0x2a7/0x710
      [<00000000f1c7a233>] nvmf_dev_write+0xc66/0x10b9
      [<000000004199f8d0>] __vfs_write+0x50/0xa0
      [<0000000065466fef>] vfs_write+0xf3/0x280
      [<00000000b0db9a8b>] ksys_write+0xc6/0x160
      [<0000000082156b91>] __x64_sys_write+0x43/0x50
      [<00000000c34fbb6d>] do_syscall_64+0x77/0x2f0
      [<00000000bbc574c9>] entry_SYSCALL_64_after_hwframe+0x49/0xbe

nvme_mpath_init() is called by nvme_init_identify() which is called in
multiple places (nvme_reset_work(), nvme_passthru_end(), etc). This
means nvme_mpath_init() may be called multiple times before
nvme_mpath_uninit() (which is only called on nvme_free_ctrl()).

When nvme_mpath_init() is called multiple times, it overwrites the
ana_log_buf pointer with a new allocation, thus leaking the previous
allocation.

To fix this, free ana_log_buf before allocating a new one.

Fixes: 0d0b660f214dc490 ("nvme: add ANA support")
Cc: <stable@vger.kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
4 years agogenirq/irqdomain: Make sure all irq domain flags are distinct
Zenghui Yu [Fri, 21 Feb 2020 02:07:25 +0000 (10:07 +0800)]
genirq/irqdomain: Make sure all irq domain flags are distinct

This was noticed when printing debugfs for MSIs on my ARM64 server.  The
new dstate IRQD_MSI_NOMASK_QUIRK came out surprisingly while it should only
be the x86 stuff for the time being...

The new MSI quirk flag uses the same bit as IRQ_DOMAIN_NAME_ALLOCATED which
is oddly defined as bit 6 for no good reason.

Switch it to the non used bit 1.

Fixes: 6f1a4891a592 ("x86/apic/msi: Plug non-maskable MSI affinity race")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200221020725.2038-1-yuzenghui@huawei.com
4 years agozonefs: fix documentation typos etc.
Randy Dunlap [Thu, 20 Feb 2020 01:28:21 +0000 (17:28 -0800)]
zonefs: fix documentation typos etc.

Fix typos, spellos, etc. in zonefs.txt.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
4 years agocsky: Implement copy_thread_tls
Guo Ren [Wed, 12 Feb 2020 02:24:52 +0000 (10:24 +0800)]
csky: Implement copy_thread_tls

This is required for clone3 which passes the TLS value through a
struct rather than a register.

Cc: Amanieu d'Antras <amanieu@gmail.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Add PCI support
MaJun [Mon, 27 Jan 2020 02:56:21 +0000 (10:56 +0800)]
csky: Add PCI support

Add the pci related code for csky arch to support basic pci virtual
function, such as qemu virt-pci-9pfs.

Signed-off-by: MaJun <majun258@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Minimize defconfig to support buildroot config.fragment
Ma Jun [Sun, 2 Feb 2020 09:56:58 +0000 (17:56 +0800)]
csky: Minimize defconfig to support buildroot config.fragment

Some bsp (eg: buildroot) has defconfig.fragment design to add more
configs into the defconfig in linux source code tree. For example,
we could put different cpu configs into different defconfig.fragments,
but they all use the same defconfig in Linux.

Signed-off-by: Ma Jun <majun258@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Add setup_initrd check code
Guo Ren [Tue, 8 Oct 2019 06:25:13 +0000 (14:25 +0800)]
csky: Add setup_initrd check code

We should give some necessary check for initrd just like other
architectures and it seems that setup_initrd() could be a common
code for all architectures.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Cleanup old Kconfig options
Krzysztof Kozlowski [Thu, 30 Jan 2020 19:22:40 +0000 (20:22 +0100)]
csky: Cleanup old Kconfig options

CONFIG_CLKSRC_OF is gone since commit bb0eb050a577
("clocksource/drivers: Rename CLKSRC_OF to TIMER_OF").  The platform
already selects TIMER_OF.

CONFIG_HAVE_DMA_API_DEBUG is gone since commit 6e88628d03dd ("dma-debug:
remove CONFIG_HAVE_DMA_API_DEBUG").

CONFIG_DEFAULT_DEADLINE is gone since commit f382fb0bcef4 ("block:
remove legacy IO schedulers").

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agoarch/csky: fix some Kconfig typos
Randy Dunlap [Sat, 1 Feb 2020 01:52:30 +0000 (17:52 -0800)]
arch/csky: fix some Kconfig typos

Fix wording in help text for the CPU_HAS_LDSTEX symbol.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Fixup compile warning for three unimplemented syscalls
Guo Ren [Sun, 2 Feb 2020 06:11:11 +0000 (14:11 +0800)]
csky: Fixup compile warning for three unimplemented syscalls

Implement fstat64, fstatat64, clone3 syscalls to fixup
checksyscalls.sh compile warnings.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Remove unused cache implementation
Guo Ren [Sun, 2 Feb 2020 02:58:38 +0000 (10:58 +0800)]
csky: Remove unused cache implementation

Only for coding convention, these codes are unnecessary for abiv2.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Fixup ftrace modify panic
Guo Ren [Sun, 2 Feb 2020 01:58:42 +0000 (09:58 +0800)]
csky: Fixup ftrace modify panic

During ftrace init, linux will replace all function prologues
(call_mcout) with nops, but it need flush_dcache and
invalidate_icache to make it work. So flush_cache functions
couldn't be nested called by ftrace framework.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Add flush_icache_mm to defer flush icache all
Guo Ren [Fri, 31 Jan 2020 12:33:10 +0000 (20:33 +0800)]
csky: Add flush_icache_mm to defer flush icache all

Some CPUs don't support icache.va instruction to maintain the whole
smp cores' icache. Using icache.all + IPI casue a lot on performace
and using defer mechanism could reduce the number of calling icache
_flush_all functions.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Optimize abiv2 copy_to_user_page with VM_EXEC
Guo Ren [Mon, 27 Jan 2020 11:57:29 +0000 (19:57 +0800)]
csky: Optimize abiv2 copy_to_user_page with VM_EXEC

Only when vma is for VM_EXEC, we need sync dcache & icache. eg:
 - gdb ptrace modify user space instruction code area.

Add VM_EXEC condition to reduce unnecessary cache flush.

The abiv1 cpus' cache are all VIPT, so we still need to deal with
dcache aliasing problem. But there is optimized way to use cache
color, just like what's done in arch/csky/abiv1/inc/abi/page.h.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Enable defer flush_dcache_page for abiv2 cpus (807/810/860)
Guo Ren [Sun, 26 Jan 2020 17:20:36 +0000 (01:20 +0800)]
csky: Enable defer flush_dcache_page for abiv2 cpus (807/810/860)

Instead of flushing cache per update_mmu_cache() called, we use
flush_dcache_page to reduce the frequency of flashing the cache.

As abiv2 cpus are all PIPT for icache & dcache, we needn't handle
dcache aliasing problem. But their icache can't snoop dcache, so
we still need sync_icache_dcache in update_mmu_cache().

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Remove unnecessary flush_icache_* implementation
Guo Ren [Fri, 24 Jan 2020 16:37:09 +0000 (00:37 +0800)]
csky: Remove unnecessary flush_icache_* implementation

The abiv2 CPUs are all PIPT cache, so there is no need to implement
flush_icache_page function.

The function flush_icache_user_range hasn't been used, so just
remove it.

The function flush_cache_range is not necessary for PIPT cache when
tlb mapping changed.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Support icache flush without specific instructions
Guo Ren [Wed, 22 Jan 2020 03:15:14 +0000 (11:15 +0800)]
csky: Support icache flush without specific instructions

Some CPUs don't support icache specific instructions to flush icache
lines in broadcast way. We use cpu control registers to flush local
icache and use IPI to notify other cores.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky/Kconfig: Add Kconfig.platforms to support some drivers
Guo Ren [Sat, 11 Jan 2020 05:44:32 +0000 (13:44 +0800)]
csky/Kconfig: Add Kconfig.platforms to support some drivers

Such as snps,dw-apb-ictl

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky/smp: Fixup boot failed when CONFIG_SMP
Guo Ren [Tue, 7 Jan 2020 04:21:25 +0000 (12:21 +0800)]
csky/smp: Fixup boot failed when CONFIG_SMP

If we use a non-ipi-support interrupt controller, it will cause panic here.
We should let cpu up and work with CONFIG_SMP, when we use a non-ipi intc.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Set regs->usp to kernel sp, when the exception is from kernel
Guo Ren [Tue, 17 Dec 2019 03:12:55 +0000 (11:12 +0800)]
csky: Set regs->usp to kernel sp, when the exception is from kernel

In the past, we didn't care about kernel sp when saving pt_reg. But in some
cases, we still need pt_reg->usp to represent the kernel stack before enter
exception.

For cmpxhg in atomic.S, we need save and restore usp for above.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky/mm: Fixup export invalid_pte_table symbol
Guo Ren [Mon, 30 Dec 2019 07:53:37 +0000 (15:53 +0800)]
csky/mm: Fixup export invalid_pte_table symbol

There is no present bit in csky pmd hardware, so we need to prepare invalid_pte_table
for empty pmd entry and the functions (pmd_none & pmd_present) in pgtable.h need
invalid_pte_talbe to get result. If a module use these functions, we need export the
symbol for it.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Mo Qihui <qihui.mo@verisilicon.com>
Cc: Zhange Jian <zhang_jian5@dahuatech.com>
4 years agocsky: Separate fixaddr_init from highmem
Guo Ren [Sun, 1 Dec 2019 14:34:19 +0000 (22:34 +0800)]
csky: Separate fixaddr_init from highmem

After fixaddr_init is separated from highmem, we could use tcm
without highmem selected. (610 (abiv1) don't support highmem,
but it could use tcm now.)

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Tightly-Coupled Memory or Sram support
Guo Ren [Wed, 27 Nov 2019 00:44:33 +0000 (08:44 +0800)]
csky: Tightly-Coupled Memory or Sram support

The implementation are not only used by TCM but also used by sram on
SOC bus. It follow existed linux tcm software interface, so that old
tcm application codes could be re-used directly.

Software interface list in asm/tcm.h:
 - Variables/Const:  __tcmdata, __tcmconst
 - Functions: __tcmfunc, __tcmlocalfunc
 - Malloc/Free: tcm_alloc, tcm_free

In linux menuconfig:
 - Choose a TCM contain instrctions + data or separated in ITCM/DTCM.
 - Determine TCM_BASE (DTCM_BASE) in phyiscal address.
 - Determine size of TCM or ITCM(DTCM) in page counts.

Here is hello tcm example from Documentation/arm/tcm.rst which could
be directly used:

/* Uninitialized data */
static u32 __tcmdata tcmvar;
/* Initialized data */
static u32 __tcmdata tcmassigned = 0x2BADBABEU;
/* Constant */
static const u32 __tcmconst tcmconst = 0xCAFEBABEU;

static void __tcmlocalfunc tcm_to_tcm(void)
{
int i;
for (i = 0; i < 100; i++)
tcmvar ++;
}

static void __tcmfunc hello_tcm(void)
{
/* Some abstract code that runs in ITCM */
int i;
for (i = 0; i < 100; i++) {
tcmvar ++;
}
tcm_to_tcm();
}

static void __init test_tcm(void)
{
u32 *tcmem;
int i;

hello_tcm();
printk("Hello TCM executed from ITCM RAM\n");

printk("TCM variable from testrun: %u @ %p\n", tcmvar, &tcmvar);
tcmvar = 0xDEADBEEFU;
printk("TCM variable: 0x%x @ %p\n", tcmvar, &tcmvar);

printk("TCM assigned variable: 0x%x @ %p\n", tcmassigned, &tcmassigned);

printk("TCM constant: 0x%x @ %p\n", tcmconst, &tcmconst);

/* Allocate some TCM memory from the pool */
tcmem = tcm_alloc(20);
if (tcmem) {
printk("TCM Allocated 20 bytes of TCM @ %p\n", tcmem);
tcmem[0] = 0xDEADBEEFU;
tcmem[1] = 0x2BADBABEU;
tcmem[2] = 0xCAFEBABEU;
tcmem[3] = 0xDEADBEEFU;
tcmem[4] = 0x2BADBABEU;
for (i = 0; i < 5; i++)
printk("TCM tcmem[%d] = %08x\n", i, tcmem[i]);
tcm_free(tcmem, 20);
}
}

TODO:
 - Separate fixup mapping from highmem
 - Support abiv1

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agocsky: Initial stack protector support
Mao Han [Fri, 11 Oct 2019 02:56:55 +0000 (10:56 +0800)]
csky: Initial stack protector support

This is a basic -fstack-protector support without per-task canary
switching. The protector will report something like when stack
corruption is detected:

It's tested with strcpy local array overflow in sys_kill and get:
stack-protector: Kernel stack is corrupted in: sys_kill+0x23c/0x23c

TODO:
 - Support task switch for different cannary

Signed-off-by: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agoMAINTAINERS: csky: Add mailing list for csky
Guo Ren [Tue, 8 Oct 2019 06:37:02 +0000 (14:37 +0800)]
MAINTAINERS: csky: Add mailing list for csky

Add mailing list and it's convenient for maintain C-SKY
subsystem.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
4 years agoext4: fix potential race between s_group_info online resizing and access
Suraj Jitindar Singh [Wed, 19 Feb 2020 03:08:50 +0000 (19:08 -0800)]
ext4: fix potential race between s_group_info online resizing and access

During an online resize an array of pointers to s_group_info gets replaced
so it can get enlarged. If there is a concurrent access to the array in
ext4_get_group_info() and this memory has been reused then this can lead to
an invalid memory access.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206443
Link: https://lore.kernel.org/r/20200221053458.730016-3-tytso@mit.edu
Signed-off-by: Suraj Jitindar Singh <surajjs@amazon.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Balbir Singh <sblbir@amazon.com>
Cc: stable@kernel.org
4 years agoext4: fix potential race between online resizing and write operations
Theodore Ts'o [Sat, 15 Feb 2020 21:40:37 +0000 (16:40 -0500)]
ext4: fix potential race between online resizing and write operations

During an online resize an array of pointers to buffer heads gets
replaced so it can get enlarged.  If there is a racing block
allocation or deallocation which uses the old array, and the old array
has gotten reused this can lead to a GPF or some other random kernel
memory getting modified.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206443
Link: https://lore.kernel.org/r/20200221053458.730016-2-tytso@mit.edu
Reported-by: Suraj Jitindar Singh <surajjs@amazon.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
4 years agoMerge tag 'drm-intel-fixes-2020-02-20' of git://anongit.freedesktop.org/drm/drm-intel...
Dave Airlie [Fri, 21 Feb 2020 02:46:54 +0000 (12:46 +1000)]
Merge tag 'drm-intel-fixes-2020-02-20' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

drm/i915 fixes for v5.6-rc3:
- Workaround missing Display Stream Compression (DSC) state readout by
  forcing modeset when its enabled at probe
- Fix EHL port clock voltage level requirements
- Fix queuing retire workers on the virtual engine
- Fix use of partially initialized waiters
- Stop using drm_pci_alloc/drm_pci/free
- Fix rewind of RING_TAIL by forcing a context reload
- Fix locking on resetting ring->head
- Propagate our bug filing URL change to stable kernels

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/87y2sxtsrd.fsf@intel.com
4 years agoMerge tag 'drm-misc-fixes-2020-02-20' of git://anongit.freedesktop.org/drm/drm-misc...
Dave Airlie [Fri, 21 Feb 2020 02:30:23 +0000 (12:30 +1000)]
Merge tag 'drm-misc-fixes-2020-02-20' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

drm-misc-fixes for v5.6-rc3:
- Fix dt binding for sunxi.
- Allow only 1 rotation argument, and allow 0 rotation in video cmdline.
- Small compiler warning fix for panfrost.
- Fix when using performance counters in panfrost when using per fd address space.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f5a6370d-9898-6c72-43e4-5bb56a99b6f2@linux.intel.com
4 years agoMerge branch 'bnxt_en-shutdown-and-kexec-kdump-related-fixes'
David S. Miller [Fri, 21 Feb 2020 00:05:42 +0000 (16:05 -0800)]
Merge branch 'bnxt_en-shutdown-and-kexec-kdump-related-fixes'

Michael Chan says:

====================
bnxt_en: shutdown and kexec/kdump related fixes.

2 small patches to fix kexec shutdown and kdump kernel driver init issues.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agobnxt_en: Issue PCIe FLR in kdump kernel to cleanup pending DMAs.
Vasundhara Volam [Thu, 20 Feb 2020 22:26:35 +0000 (17:26 -0500)]
bnxt_en: Issue PCIe FLR in kdump kernel to cleanup pending DMAs.

If crashed kernel does not shutdown the NIC properly, PCIe FLR
is required in the kdump kernel in order to initialize all the
functions properly.

Fixes: d629522e1d66 ("bnxt_en: Reduce memory usage when running in kdump kernel.")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agobnxt_en: Improve device shutdown method.
Vasundhara Volam [Thu, 20 Feb 2020 22:26:34 +0000 (17:26 -0500)]
bnxt_en: Improve device shutdown method.

Especially when bnxt_shutdown() is called during kexec, we need to
disable MSIX and disable Bus Master to completely quiesce the device.
Make these 2 calls unconditionally in the shutdown method.

Fixes: c20dc142dd7b ("bnxt_en: Disable bus master during PCI shutdown and driver unload.")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: netlink: cap max groups which will be considered in netlink_bind()
Nikolay Aleksandrov [Thu, 20 Feb 2020 14:42:13 +0000 (16:42 +0200)]
net: netlink: cap max groups which will be considered in netlink_bind()

Since nl_groups is a u32 we can't bind more groups via ->bind
(netlink_bind) call, but netlink has supported more groups via
setsockopt() for a long time and thus nlk->ngroups could be over 32.
Recently I added support for per-vlan notifications and increased the
groups to 33 for NETLINK_ROUTE which exposed an old bug in the
netlink_bind() code causing out-of-bounds access on archs where unsigned
long is 32 bits via test_bit() on a local variable. Fix this by capping the
maximum groups in netlink_bind() to BITS_PER_TYPE(u32), effectively
capping them at 32 which is the minimum of allocated groups and the
maximum groups which can be bound via netlink_bind().

CC: Christophe Leroy <christophe.leroy@c-s.fr>
CC: Richard Guy Briggs <rgb@redhat.com>
Fixes: 4f520900522f ("netlink: have netlink per-protocol bind function return an error code.")
Reported-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: thunderx: workaround BGX TX Underflow issue
Tim Harvey [Wed, 19 Feb 2020 23:19:36 +0000 (15:19 -0800)]
net: thunderx: workaround BGX TX Underflow issue

While it is not yet understood why a TX underflow can easily occur
for SGMII interfaces resulting in a TX wedge. It has been found that
disabling/re-enabling the LMAC resolves the issue.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Robert Jones <rjones@gateworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoionic: fix fw_status read
Shannon Nelson [Wed, 19 Feb 2020 22:59:42 +0000 (14:59 -0800)]
ionic: fix fw_status read

The fw_status field is only 8 bits, so fix the read.  Also,
we only want to look at the one status bit, to allow for future
use of the other bits, and watch for a bad PCI read.

Fixes: 97ca486592c0 ("ionic: add heartbeat check")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar...
Linus Torvalds [Thu, 20 Feb 2020 23:15:16 +0000 (15:15 -0800)]
Merge branch 'next-integrity' of git://git./linux/kernel/git/zohar/linux-integrity

Pull IMA fixes from Mimi Zohar:
 "Two bug fixes and an associated change for each.

  The one that adds SM3 to the IMA list of supported hash algorithms is
  a simple change, but could be considered a new feature"

* 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
  ima: add sm3 algorithm to hash algorithm configuration list
  crypto: rename sm3-256 to sm3 in hash_algo_name
  efi: Only print errors about failing to get certs if EFI vars are found
  x86/ima: use correct identifier for SetupMode variable

4 years agonet: disable BRIDGE_NETFILTER by default
Roman Kiryanov [Wed, 19 Feb 2020 21:40:06 +0000 (13:40 -0800)]
net: disable BRIDGE_NETFILTER by default

The description says 'If unsure, say N.' but
the module is built as M by default (once
the dependencies are satisfied).

When the module is selected (Y or M), it enables
NETFILTER_FAMILY_BRIDGE and SKB_EXTENSIONS
which alter kernel internal structures.

We (Android Studio Emulator) currently do not
use this module and think this it is more consistent
to have it disabled by default as opposite to
disabling it explicitly to prevent enabling
NETFILTER_FAMILY_BRIDGE and SKB_EXTENSIONS.

Signed-off-by: Roman Kiryanov <rkir@google.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: macb: Properly handle phylink on at91rm9200
Alexandre Belloni [Wed, 19 Feb 2020 14:15:51 +0000 (15:15 +0100)]
net: macb: Properly handle phylink on at91rm9200

at91ether_init was handling the phy mode and speed but since the switch to
phylink, the NCFGR register got overwritten by macb_mac_config(). The issue
is that the RM9200_RMII bit and the MACB_CLK_DIV32 field are cleared
but never restored as they conflict with the PAE, GBE and PCSSEL bits.

Add new capability to differentiate between EMAC and the other versions of
the IP and use it to set and avoid clearing the relevant bits.

Also, this fixes a NULL pointer dereference in macb_mac_link_up as the EMAC
doesn't use any rings/bufffers/queues.

Fixes: 7897b071ac3b ("net: macb: convert to phylink")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoxen: Enable interrupts when calling _cond_resched()
Thomas Gleixner [Wed, 19 Feb 2020 17:30:26 +0000 (18:30 +0100)]
xen: Enable interrupts when calling _cond_resched()

xen_maybe_preempt_hcall() is called from the exception entry point
xen_do_hypervisor_callback with interrupts disabled.

_cond_resched() evades the might_sleep() check in cond_resched() which
would have caught that and schedule_debug() unfortunately lacks a check
for irqs_disabled().

Enable interrupts around the call and use cond_resched() to catch future
issues.

Fixes: fdfd811ddde3 ("x86/xen: allow privcmd hypercalls to be preempted")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/878skypjrh.fsf@nanos.tec.linutronix.de
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
4 years agoMerge branch 's390-fixes'
David S. Miller [Thu, 20 Feb 2020 18:30:47 +0000 (10:30 -0800)]
Merge branch 's390-fixes'

Julian Wiedmann says:

====================
s390/qeth: fixes 2020-02-20

please apply the following patch series for qeth to netdev's net tree.

This corrects three minor issues:
1) return a more fitting errno when VNICC cmds are not supported,
2) remove a bogus WARN in the NAPI code, and
3) be _very_ pedantic about the RX copybreak.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agos390/qeth: fix off-by-one in RX copybreak check
Julian Wiedmann [Thu, 20 Feb 2020 14:54:56 +0000 (15:54 +0100)]
s390/qeth: fix off-by-one in RX copybreak check

The RX copybreak is intended as the _max_ value where the frame's data
should be copied. So for frame_len == copybreak, don't build an SG skb.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agos390/qeth: don't warn for napi with 0 budget
Julian Wiedmann [Thu, 20 Feb 2020 14:54:55 +0000 (15:54 +0100)]
s390/qeth: don't warn for napi with 0 budget

Calling napi->poll() with 0 budget is a legitimate use by netpoll.

Fixes: a1c3ed4c9ca0 ("qeth: NAPI support for l2 and l3 discipline")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agos390/qeth: vnicc Fix EOPNOTSUPP precedence
Alexandra Winter [Thu, 20 Feb 2020 14:54:54 +0000 (15:54 +0100)]
s390/qeth: vnicc Fix EOPNOTSUPP precedence

When getting or setting VNICC parameters, the error code EOPNOTSUPP
should have precedence over EBUSY.

EBUSY is used because vnicc feature and bridgeport feature are mutually
exclusive, which is a temporary condition.
Whereas EOPNOTSUPP indicates that the HW does not support all or parts of
the vnicc feature.
This issue causes the vnicc sysfs params to show 'blocked by bridgeport'
for HW that does not support VNICC at all.

Fixes: caa1f0b10d18 ("s390/qeth: add VNICC enable/disable support")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoopenvswitch: Distribute switch variables for initialization
Kees Cook [Thu, 20 Feb 2020 06:23:09 +0000 (22:23 -0800)]
openvswitch: Distribute switch variables for initialization

Variables declared in a switch statement before any case statements
cannot be automatically initialized with compiler instrumentation (as
they are not part of any execution flow). With GCC's proposed automatic
stack variable initialization feature, this triggers a warning (and they
don't get initialized). Clang's automatic stack variable initialization
(via CONFIG_INIT_STACK_ALL=y) doesn't throw a warning, but it also
doesn't initialize such variables[1]. Note that these warnings (or silent
skipping) happen before the dead-store elimination optimization phase,
so even when the automatic initializations are later elided in favor of
direct initializations, the warnings remain.

To avoid these problems, move such variables into the "case" where
they're used or lift them up into the main function body.

net/openvswitch/flow_netlink.c: In function ‘validate_set’:
net/openvswitch/flow_netlink.c:2711:29: warning: statement will never be executed [-Wswitch-unreachable]
 2711 |  const struct ovs_key_ipv4 *ipv4_key;
      |                             ^~~~~~~~

[1] https://bugs.llvm.org/show_bug.cgi?id=44916

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: ip6_gre: Distribute switch variables for initialization
Kees Cook [Thu, 20 Feb 2020 06:23:07 +0000 (22:23 -0800)]
net: ip6_gre: Distribute switch variables for initialization

Variables declared in a switch statement before any case statements
cannot be automatically initialized with compiler instrumentation (as
they are not part of any execution flow). With GCC's proposed automatic
stack variable initialization feature, this triggers a warning (and they
don't get initialized). Clang's automatic stack variable initialization
(via CONFIG_INIT_STACK_ALL=y) doesn't throw a warning, but it also
doesn't initialize such variables[1]. Note that these warnings (or silent
skipping) happen before the dead-store elimination optimization phase,
so even when the automatic initializations are later elided in favor of
direct initializations, the warnings remain.

To avoid these problems, move such variables into the "case" where
they're used or lift them up into the main function body.

net/ipv6/ip6_gre.c: In function ‘ip6gre_err’:
net/ipv6/ip6_gre.c:440:32: warning: statement will never be executed [-Wswitch-unreachable]
  440 |   struct ipv6_tlv_tnl_enc_lim *tel;
      |                                ^~~

net/ipv6/ip6_tunnel.c: In function ‘ip6_tnl_err’:
net/ipv6/ip6_tunnel.c:520:32: warning: statement will never be executed [-Wswitch-unreachable]
  520 |   struct ipv6_tlv_tnl_enc_lim *tel;
      |                                ^~~

[1] https://bugs.llvm.org/show_bug.cgi?id=44916

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: core: Distribute switch variables for initialization
Kees Cook [Thu, 20 Feb 2020 06:23:04 +0000 (22:23 -0800)]
net: core: Distribute switch variables for initialization

Variables declared in a switch statement before any case statements
cannot be automatically initialized with compiler instrumentation (as
they are not part of any execution flow). With GCC's proposed automatic
stack variable initialization feature, this triggers a warning (and they
don't get initialized). Clang's automatic stack variable initialization
(via CONFIG_INIT_STACK_ALL=y) doesn't throw a warning, but it also
doesn't initialize such variables[1]. Note that these warnings (or silent
skipping) happen before the dead-store elimination optimization phase,
so even when the automatic initializations are later elided in favor of
direct initializations, the warnings remain.

To avoid these problems, move such variables into the "case" where
they're used or lift them up into the main function body.

net/core/skbuff.c: In function ‘skb_checksum_setup_ip’:
net/core/skbuff.c:4809:7: warning: statement will never be executed [-Wswitch-unreachable]
 4809 |   int err;
      |       ^~~

[1] https://bugs.llvm.org/show_bug.cgi?id=44916

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agox86/xen: Distribute switch variables for initialization
Kees Cook [Thu, 20 Feb 2020 06:23:18 +0000 (22:23 -0800)]
x86/xen: Distribute switch variables for initialization

Variables declared in a switch statement before any case statements
cannot be automatically initialized with compiler instrumentation (as
they are not part of any execution flow). With GCC's proposed automatic
stack variable initialization feature, this triggers a warning (and they
don't get initialized). Clang's automatic stack variable initialization
(via CONFIG_INIT_STACK_ALL=y) doesn't throw a warning, but it also
doesn't initialize such variables[1]. Note that these warnings (or silent
skipping) happen before the dead-store elimination optimization phase,
so even when the automatic initializations are later elided in favor of
direct initializations, the warnings remain.

To avoid these problems, move such variables into the "case" where
they're used or lift them up into the main function body.

arch/x86/xen/enlighten_pv.c: In function ‘xen_write_msr_safe’:
arch/x86/xen/enlighten_pv.c:904:12: warning: statement will never be executed [-Wswitch-unreachable]
  904 |   unsigned which;
      |            ^~~~~

[1] https://bugs.llvm.org/show_bug.cgi?id=44916

Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20200220062318.69299-1-keescook@chromium.org
Reviewed-by: Juergen Gross <jgross@suse.com>
[boris: made @which an 'unsigned int']
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>