Merge tag 'for-linus-5.15-rc1' of git://git./linux/kernel/git/rw/uml

Pull UML updates from Richard Weinberger:

 - Support for VMAP_STACK

 - Support for splice_write in hostfs

 - Fixes for virt-pci

 - Fixes for virtio_uml

 - Various fixes

* tag 'for-linus-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: fix stub location calculation
  um: virt-pci: fix uapi documentation
  um: enable VMAP_STACK
  um: virt-pci: don't do DMA from stack
  hostfs: support splice_write
  um: virtio_uml: fix memory leak on init failures
  um: virtio_uml: include linux/virtio-uml.h
  lib/logic_iomem: fix sparse warnings
  um: make PCI emulation driver init/exit static

Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM development updates from Russell King:

 - Rename "mod_init" and "mod_exit" so that initcall debug output is
   actually useful (Randy Dunlap)

 - Update maintainers entries for linux-arm-kernel to indicate it is
   moderated for non-subscribers (Randy Dunlap)

 - Move install rules to arch/arm/Makefile (Masahiro Yamada)

 - Drop unnecessary ARCH_NR_GPIOS definition (Linus Walleij)

 - Don't warn about atags_to_fdt() stack size (David Heidelberg)

 - Speed up unaligned copy_{from,to}_kernel_nofault (Arnd Bergmann)

 - Get rid of set_fs() usage (Arnd Bergmann)

 - Remove checks for GCC prior to v4.6 (Geert Uytterhoeven)

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 9118/1: div64: Remove always-true __div64_const32_is_OK() duplicate
  ARM: 9117/1: asm-generic: div64: Remove always-true __div64_const32_is_OK()
  ARM: 9116/1: unified: Remove check for gcc < 4
  ARM: 9110/1: oabi-compat: fix oabi epoll sparse warning
  ARM: 9113/1: uaccess: remove set_fs() implementation
  ARM: 9112/1: uaccess: add __{get,put}_kernel_nofault
  ARM: 9111/1: oabi-compat: rework fcntl64() emulation
  ARM: 9114/1: oabi-compat: rework sys_semtimedop emulation
  ARM: 9108/1: oabi-compat: rework epoll_wait/epoll_pwait emulation
  ARM: 9107/1: syscall: always store thread_info->abi_syscall
  ARM: 9109/1: oabi-compat: add epoll_pwait handler
  ARM: 9106/1: traps: use get_kernel_nofault instead of set_fs()
  ARM: 9115/1: mm/maccess: fix unaligned copy_{from,to}_kernel_nofault
  ARM: 9105/1: atags_to_fdt: don't warn about stack size
  ARM: 9103/1: Drop ARCH_NR_GPIOS definition
  ARM: 9102/1: move theinstall rules to arch/arm/Makefile
  ARM: 9100/1: MAINTAINERS: mark all linux-arm-kernel@infradead list as moderated
  ARM: 9099/1: crypto: rename 'mod_init' & 'mod_exit' functions to be module-specific

Merge tag 'trace-v5.15-2' of git://git./linux/kernel/git/rostedt/linux-trace

Pull more tracing updates from Steven Rostedt:

 - Add migrate-disable counter to tracing header

 - Fix error handling in event probes

 - Fix missed unlock in osnoise in error path

 - Fix merge issue with tools/bootconfig

 - Clean up bootconfig data when init memory is removed

 - Fix bootconfig to loop only on subkeys

 - Have kernel command lines override bootconfig options

 - Increase field counts for synthetic events

 - Have histograms dynamic allocate event elements to save space

 - Fixes in testing and documentation

* tag 'trace-v5.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing/boot: Fix to loop on only subkeys
  selftests/ftrace: Exclude "(fault)" in testing add/remove eprobe events
  tracing: Dynamically allocate the per-elt hist_elt_data array
  tracing: synth events: increase max fields count
  tools/bootconfig: Show whole test command for each test case
  bootconfig: Fix missing return check of xbc_node_compose_key function
  tools/bootconfig: Fix tracing_on option checking in ftrace2bconf.sh
  docs: bootconfig: Add how to use bootconfig for kernel parameters
  init/bootconfig: Reorder init parameter from bootconfig and cmdline
  init: bootconfig: Remove all bootconfig data when the init memory is removed
  tracing/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
  tracing: Fix some alloc_event_probe() error handling bugs
  tracing: Add migrate-disabled counter to tracing output.

Merge tag 's390-5.15-2' of git://git./linux/kernel/git/s390/linux

Pull more s390 updates from Heiko Carstens:
 "Except for the xpram device driver removal it is all about fixes and
  cleanups.

   - Fix topology update on cpu hotplug, so notifiers see expected
     masks. This bug was uncovered with SCHED_CORE support.

   - Fix stack unwinding so that the correct number of entries are
     omitted like expected by common code. This fixes KCSAN selftests.

   - Add kmemleak annotation to stack_alloc to avoid false positive
     kmemleak warnings.

   - Avoid layering violation in common I/O code and don't unregister
     subchannel from child-drivers.

   - Remove xpram device driver for which no real use case exists since
     the kernel is 64 bit only. Also all hypervisors got required
     support removed in the meantime, which means the xpram device
     driver is dead code.

   - Fix -ENODEV handling of clp_get_state in our PCI code.

   - Enable KFENCE in debug defconfig.

   - Cleanup hugetlbfs s390 specific Kconfig dependency.

   - Quite a lot of trivial fixes to get rid of "W=1" warnings, and and
     other simple cleanups"

* tag 's390-5.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  hugetlbfs: s390 is always 64bit
  s390/ftrace: remove incorrect __va usage
  s390/zcrypt: remove incorrect kernel doc indicators
  scsi: zfcp: fix kernel doc comments
  s390/sclp: add __nonstring annotation
  s390/hmcdrv_ftp: fix kernel doc comment
  s390: remove xpram device driver
  s390/pci: read clp_list_pci_req only once
  s390/pci: fix clp_get_state() handling of -ENODEV
  s390/cio: fix kernel doc comment
  s390/ctrlchar: fix kernel doc comment
  s390/con3270: use proper type for tasklet function
  s390/cpum_cf: move array from header to C file
  s390/mm: fix kernel doc comments
  s390/topology: fix topology information when calling cpu hotplug notifiers
  s390/unwind: use current_frame_address() to unwind current task
  s390/configs: enable CONFIG_KFENCE in debug_defconfig
  s390/entry: make oklabel within CHKSTG macro local
  s390: add kmemleak annotation in stack_alloc()
  s390/cio: dont unregister subchannel from child-drivers

Merge branch 'work.gfs2' of git://git./linux/kernel/git/viro/vfs

Pull gfs2 setattr updates from Al Viro:
 "Make it possible for filesystems to use a generic 'may_setattr()' and
  switch gfs2 to using it"

* 'work.gfs2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  gfs2: Switch to may_setattr in gfs2_setattr
  fs: Move notify_change permission checks into may_setattr

Merge branch 'work.init' of git://git./linux/kernel/git/viro/vfs

Pull root filesystem type handling updates from Al Viro:
 "Teach init/do_mounts.c to handle non-block filesystems, hopefully
  preventing even more special-cased kludges (such as root=/dev/nfs,
  etc)"

* 'work.init' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs: simplify get_filesystem_list / get_all_fs_names
  init: allow mounting arbitrary non-blockdevice filesystems as root
  init: split get_fs_names

Merge branch 'work.iov_iter' of git://git./linux/kernel/git/viro/vfs

Pull iov_iter fixes from Al Viro:
 "Fixes for io-uring handling of iov_iter reexpands"

* 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  io_uring: reexpand under-reexpanded iters
  iov_iter: track truncated size

Merge tag 'cxl-for-5.15' of git://git./linux/kernel/git/cxl/cxl

Pull CXL (Compute Express Link) updates from Dan Williams:

 - Fix detection of CXL host bridges to filter out disabled ACPI0016
   devices in the ACPI DSDT.

 - Fix kernel lockdown integration to disable raw commands when raw PCI
   access is disabled.

 - Fix a broken debug message.

 - Add support for "Get Partition Info". I.e. enumerate the split
   between volatile and persistent capacity on bi-modal CXL memory
   expanders.

 - Re-factor the core by subject area. This is a work in progress.

 - Prepare libnvdimm to understand CXL labels in addition to EFI labels.
   This is a work in progress.

* tag 'cxl-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (25 commits)
  cxl/registers: Fix Documentation warning
  cxl/pmem: Fix Documentation warning
  cxl/uapi: Fix defined but not used warnings
  cxl/pci: Fix debug message in cxl_probe_regs()
  cxl/pci: Fix lockdown level
  cxl/acpi: Do not add DSDT disabled ACPI0016 host bridge ports
  libnvdimm/labels: Add claim class helpers
  libnvdimm/labels: Add type-guid helpers
  libnvdimm/labels: Add blk special cases for nlabel and position helpers
  libnvdimm/labels: Add blk isetcookie set / validation helpers
  libnvdimm/labels: Add a checksum calculation helper
  libnvdimm/labels: Introduce label setter helpers
  libnvdimm/labels: Add isetcookie validation helper
  libnvdimm/labels: Introduce getters for namespace label fields
  cxl/mem: Adjust ram/pmem range to represent DPA ranges
  cxl/mem: Account for partitionable space in ram/pmem ranges
  cxl/pci: Store memory capacity values
  cxl/pci: Simplify register setup
  cxl/pci: Ignore unknown register block types
  cxl/core: Move memdev management to core
  ...

Merge tag 'libnvdimm-for-5.15' of git://git./linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Dan Williams:

 - Fix a race condition in the teardown path of raw mode pmem
   namespaces.

 - Cleanup the code that filesystems use to detect filesystem-dax
   capabilities of their underlying block device.

* tag 'libnvdimm-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: remove bdev_dax_supported
  xfs: factor out a xfs_buftarg_is_dax helper
  dax: stub out dax_supported for !CONFIG_FS_DAX
  dax: remove __generic_fsdax_supported
  dax: move the dax_read_lock() locking into dax_supported
  dax: mark dax_get_by_host static
  dm: use fs_dax_get_by_bdev instead of dax_get_by_host
  dax: stop using bdevname
  fsdax: improve the FS_DAX Kconfig description and help text
  libnvdimm/pmem: Fix crash triggered when I/O in-flight during unbind

Merge tag 'for-linus' of git://git./linux/kernel/git/rdma/rdma

Pull rdma fixes from Jason Gunthorpe:
 "I don't usually send a second PR in the merge window, but the fix to
  mlx5 is significant enough that it should start going through the
  process ASAP. Along with it comes some of the usual -rc stuff that
  would normally wait for a -rc2 or so.

  Summary:

  Important error case regression fixes in mlx5:

   - Wrong size used when computing the error path smaller allocation
     request leads to corruption

   - Confusing but ultimately harmless alignment mis-calculation

  Static checker warning fixes:

   - NULL pointer subtraction in qib

   - kcalloc in bnxt_re

   - Missing static on global variable in hfi1"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  IB/hfi1: make hist static
  RDMA/bnxt_re: Prefer kcalloc over open coded arithmetic
  IB/qib: Fix null pointer subtraction compiler warning
  RDMA/mlx5: Fix xlt_chunk_align calculation
  RDMA/mlx5: Fix number of allocated XLT entries

Merge tag 'dmaengine-5.15-rc1' of git://git./linux/kernel/git/vkoul/dmaengine

Pull dmaengine updates from Vinod Koul:
 "New drivers/devices
   - Support for Renesas RZ/G2L dma controller
   - New driver for AMD PTDMA controller

  Updates:
   - Big pile of idxd updates
   - Updates for Altera driver, stm32-dma, dw etc"

* tag 'dmaengine-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (83 commits)
  dmaengine: sh: fix some NULL dereferences
  dmaengine: sh: Fix unused initialization of pointer lmdesc
  MAINTAINERS: Fix AMD PTDMA DRIVER entry
  dmaengine: ptdma: remove PT_OFFSET to avoid redefnition
  dmaengine: ptdma: Add debugfs entries for PTDMA
  dmaengine: ptdma: register PTDMA controller as a DMA resource
  dmaengine: ptdma: Initial driver for the AMD PTDMA
  dmaengine: fsl-dpaa2-qdma: Fix spelling mistake "faile" -> "failed"
  dmaengine: idxd: remove interrupt disable for dev_lock
  dmaengine: idxd: remove interrupt disable for cmd_lock
  dmaengine: idxd: fix setting up priv mode for dwq
  dmaengine: xilinx_dma: Set DMA mask for coherent APIs
  dmaengine: ti: k3-psil-j721e: Add entry for CSI2RX
  dmaengine: sh: Add DMAC driver for RZ/G2L SoC
  dmaengine: Extend the dma_slave_width for 128 bytes
  dt-bindings: dma: Document RZ/G2L bindings
  dmaengine: ioat: depends on !UML
  dmaengine: idxd: set descriptor allocation size to threshold for swq
  dmaengine: idxd: make submit failure path consistent on desc freeing
  dmaengine: idxd: remove interrupt flag for completion list spinlock
  ...

Merge branches 'akpm' and 'akpm-hotfixes' (patches from Andrew)

Merge yet more updates and hotfixes from Andrew Morton:
 "Post-linux-next material, based upon latest upstream to catch the
  now-merged dependencies:

   - 10 patches.

     Subsystems affected by this patch series: mm (vmstat and migration)
     and compat.

  And bunch of hotfixes, mostly cc:stable:

   - 8 patches.

     Subsystems affected by this patch series: mm (hmm, hugetlb, vmscan,
     pagealloc, pagemap, kmemleak, mempolicy, and memblock)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  arch: remove compat_alloc_user_space
  compat: remove some compat entry points
  mm: simplify compat numa syscalls
  mm: simplify compat_sys_move_pages
  kexec: avoid compat_alloc_user_space
  kexec: move locking into do_kexec_load
  mm: migrate: change to use bool type for 'page_was_mapped'
  mm: migrate: fix the incorrect function name in comments
  mm: migrate: introduce a local variable to get the number of pages
  mm/vmstat: protect per cpu variables with preempt disable on RT

* emailed hotfixes from Andrew Morton <akpm@linux-foundation.org>:
  nds32/setup: remove unused memblock_region variable in setup_memory()
  mm/mempolicy: fix a race between offset_il_node and mpol_rebind_task
  mm/kmemleak: allow __GFP_NOLOCKDEP passed to kmemleak's gfp
  mmap_lock: change trace and locking order
  mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype
  mm,vmscan: fix divide by zero in get_scan_count
  mm/hugetlb: initialize hugetlb_usage in mm_init
  mm/hmm: bypass devmap pte when all pfn requested flags are fulfilled

nds32/setup: remove unused memblock_region variable in setup_memory()

kernel test robot reports unused variable warning:

   arch/nds32/kernel/setup.c:247:26: warning: Unused variable: region
   [unusedVariable]
    struct memblock_region *region;
                            ^

Remove the unused variable.

Link: https://lkml.kernel.org/r/20210712125218.28951-1-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/mempolicy: fix a race between offset_il_node and mpol_rebind_task

Servers happened below panic:

  Kernel version:5.4.56
  BUG: unable to handle page fault for address: 0000000000002c48
  RIP: 0010:__next_zones_zonelist+0x1d/0x40
  Call Trace:
    __alloc_pages_nodemask+0x277/0x310
    alloc_page_interleave+0x13/0x70
    handle_mm_fault+0xf99/0x1390
    __do_page_fault+0x288/0x500
    do_page_fault+0x30/0x110
    page_fault+0x3e/0x50

The reason for the panic is that MAX_NUMNODES is passed in the third
parameter in __alloc_pages_nodemask(preferred_nid).  So access to
zonelist->zoneref->zone_idx in __next_zones_zonelist will cause a panic.

In offset_il_node(), first_node() returns nid from pol->v.nodes, after
this other threads may chang pol->v.nodes before next_node().  This race
condition will let next_node return MAX_NUMNODES.  So put pol->nodes in
a local variable.

The race condition is between offset_il_node and cpuset_change_task_nodemask:

  CPU0:                                     CPU1:
  alloc_pages_vma()
    interleave_nid(pol,)
      offset_il_node(pol,)
        first_node(pol->v.nodes)            cpuset_change_task_nodemask
                        //nodes==0xc          mpol_rebind_task
                                                mpol_rebind_policy
                                                  mpol_rebind_nodemask(pol,nodes)
                        //nodes==0x3
        next_node(nid, pol->v.nodes)//return MAX_NUMNODES

Link: https://lkml.kernel.org/r/20210906034658.48721-1-yanghui.def@bytedance.com
Signed-off-by: yanghui <yanghui.def@bytedance.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/kmemleak: allow __GFP_NOLOCKDEP passed to kmemleak's gfp

In a memory pressure situation, I'm seeing the lockdep WARNING below.
Actually, this is similar to a known false positive which is already
addressed by commit 6dcde60efd94 ("xfs: more lockdep whackamole with
kmem_alloc*").

This warning still persists because it's not from kmalloc() itself but
from an allocation for kmemleak object.  While kmalloc() itself suppress
the warning with __GFP_NOLOCKDEP, gfp_kmemleak_mask() is dropping the
flag for the kmemleak's allocation.

Allow __GFP_NOLOCKDEP to be passed to kmemleak's allocation, so that the
warning for it is also suppressed.

  ======================================================
  WARNING: possible circular locking dependency detected
  5.14.0-rc7-BTRFS-ZNS+ #37 Not tainted
  ------------------------------------------------------
  kswapd0/288 is trying to acquire lock:
  ffff88825ab45df0 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x8a/0x250

  but task is already holding lock:
  ffffffff848cc1e0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x5/0x30

  which lock already depends on the new lock.

  the existing dependency chain (in reverse order) is:

  -> #1 (fs_reclaim){+.+.}-{0:0}:
         fs_reclaim_acquire+0x112/0x160
         kmem_cache_alloc+0x48/0x400
         create_object.isra.0+0x42/0xb10
         kmemleak_alloc+0x48/0x80
         __kmalloc+0x228/0x440
         kmem_alloc+0xd3/0x2b0
         kmem_alloc_large+0x5a/0x1c0
         xfs_attr_copy_value+0x112/0x190
         xfs_attr_shortform_getvalue+0x1fc/0x300
         xfs_attr_get_ilocked+0x125/0x170
         xfs_attr_get+0x329/0x450
         xfs_get_acl+0x18d/0x430
         get_acl.part.0+0xb6/0x1e0
         posix_acl_xattr_get+0x13a/0x230
         vfs_getxattr+0x21d/0x270
         getxattr+0x126/0x310
         __x64_sys_fgetxattr+0x1a6/0x2a0
         do_syscall_64+0x3b/0x90
         entry_SYSCALL_64_after_hwframe+0x44/0xae

  -> #0 (&xfs_nondir_ilock_class){++++}-{3:3}:
         __lock_acquire+0x2c0f/0x5a00
         lock_acquire+0x1a1/0x4b0
         down_read_nested+0x50/0x90
         xfs_ilock+0x8a/0x250
         xfs_can_free_eofblocks+0x34f/0x570
         xfs_inactive+0x411/0x520
         xfs_fs_destroy_inode+0x2c8/0x710
         destroy_inode+0xc5/0x1a0
         evict+0x444/0x620
         dispose_list+0xfe/0x1c0
         prune_icache_sb+0xdc/0x160
         super_cache_scan+0x31e/0x510
         do_shrink_slab+0x337/0x8e0
         shrink_slab+0x362/0x5c0
         shrink_node+0x7a7/0x1a40
         balance_pgdat+0x64e/0xfe0
         kswapd+0x590/0xa80
         kthread+0x38c/0x460
         ret_from_fork+0x22/0x30

  other info that might help us debug this:
   Possible unsafe locking scenario:
         CPU0                    CPU1
         ----                    ----
    lock(fs_reclaim);
                                 lock(&xfs_nondir_ilock_class);
                                 lock(fs_reclaim);
    lock(&xfs_nondir_ilock_class);

   *** DEADLOCK ***
  3 locks held by kswapd0/288:
   #0: ffffffff848cc1e0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x5/0x30
   #1: ffffffff848a08d8 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x269/0x5c0
   #2: ffff8881a7a820e8 (&type->s_umount_key#60){++++}-{3:3}, at: super_cache_scan+0x5a/0x510

Link: https://lkml.kernel.org/r/20210907055659.3182992-1-naohiro.aota@wdc.com
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: "Darrick J . Wong" <djwong@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mmap_lock: change trace and locking order

Print to the trace log before releasing the lock to avoid racing with
other trace log printers of the same lock type.

Link: https://lkml.kernel.org/r/20210903022041.1843024-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michel Lespinasse <walken.cr@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype

If it's not prepared to free unref page, the pcp page migratetype is
unset.  Thus we will get rubbish from get_pcppage_migratetype() and
might list_del(&page->lru) again after it's already deleted from the list
leading to grumble about data corruption.

Link: https://lkml.kernel.org/r/20210902115447.57050-1-linmiaohe@huawei.com
Fixes: df1acc856923 ("mm/page_alloc: avoid conflating IRQs disabled with zone->lock")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm,vmscan: fix divide by zero in get_scan_count

Commit f56ce412a59d ("mm: memcontrol: fix occasional OOMs due to
proportional memory.low reclaim") introduced a divide by zero corner
case when oomd is being used in combination with cgroup memory.low
protection.

When oomd decides to kill a cgroup, it will force the cgroup memory to
be reclaimed after killing the tasks, by writing to the memory.max file
for that cgroup, forcing the remaining page cache and reclaimable slab
to be reclaimed down to zero.

Previously, on cgroups with some memory.low protection that would result
in the memory being reclaimed down to the memory.low limit, or likely
not at all, having the page cache reclaimed asynchronously later.

With f56ce412a59d the oomd write to memory.max tries to reclaim all the
way down to zero, which may race with another reclaimer, to the point of
ending up with the divide by zero below.

This patch implements the obvious fix.

Link: https://lkml.kernel.org/r/20210826220149.058089c6@imladris.surriel.com
Fixes: f56ce412a59d ("mm: memcontrol: fix occasional OOMs due to proportional memory.low reclaim")
Signed-off-by: Rik van Riel <riel@surriel.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Chris Down <chris@chrisdown.name>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb: initialize hugetlb_usage in mm_init

After fork, the child process will get incorrect (2x) hugetlb_usage.  If
a process uses 5 2MB hugetlb pages in an anonymous mapping,

HugetlbPages:    10240 kB

and then forks, the child will show,

HugetlbPages:    20480 kB

The reason for double the amount is because hugetlb_usage will be copied
from the parent and then increased when we copy page tables from parent
to child.  Child will have 2x actual usage.

Fix this by adding hugetlb_count_init in mm_init.

Link: https://lkml.kernel.org/r/20210826071742.877-1-liuzixian4@huawei.com
Fixes: 5d317b2b6536 ("mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status")
Signed-off-by: Liu Zixian <liuzixian4@huawei.com>
Reviewed-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hmm: bypass devmap pte when all pfn requested flags are fulfilled

Previously, we noticed the one rpma example was failed[1] since commit
36f30e486dce ("IB/core: Improve ODP to use hmm_range_fault()"), where it
will use ODP feature to do RDMA WRITE between fsdax files.

After digging into the code, we found hmm_vma_handle_pte() will still
return EFAULT even though all the its requesting flags has been
fulfilled.  That's because a DAX page will be marked as (_PAGE_SPECIAL |
PAGE_DEVMAP) by pte_mkdevmap().

Link: https://github.com/pmem/rpma/issues/1142
Link: https://lkml.kernel.org/r/20210830094232.203029-1-lizhijian@cn.fujitsu.com
Fixes: 405506274922 ("mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL handling")
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge tag 'tag-chrome-platform-for-v5.15' of git://git./linux/kernel/git/chrome-platform/linux

Pull chrome platform updates from Benson Leung:
 "cros_ec_typec:

   - make the cros_ec_typec driver to use the pre-existing
     cros_ec_check_features() function

  sensorhub:

   - add trace events for sample

  misc:

   - cros_ec_proto - re-send commands in the event of a timeout (for the
     FPMCU)

   - fix warnings in cros_ec_trace related to format output"

* tag 'tag-chrome-platform-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux:
  platform/chrome: cros_ec_trace: Fix format warnings
  platform/chrome: cros_ec_typec: Use existing feature check
  platform/chrome: cros_ec_proto: Send command again when timeout occurs
  platform/chrome: sensorhub: Add trace events for sample

Merge tag 'pm-5.15-rc1-2' of git://git./linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:
 "These are mostly ARM cpufreq driver updates, including one new
  MediaTek driver that has just passed all of the reviews, with the
  addition of a revert of a recent intel_pstate commit, some core
  cpufreq changes and a DT-related update of the operating performance
  points (OPP) support code.

  Specifics:

   - Add new cpufreq driver for the MediaTek MT6779 platform called
     mediatek-hw along with corresponding DT bindings (Hector.Yuan).

   - Add DCVS interrupt support to the qcom-cpufreq-hw driver (Thara
     Gopinath).

   - Make the qcom-cpufreq-hw driver set the dvfs_possible_from_any_cpu
     policy flag (Taniya Das).

   - Blocklist more Qualcomm platforms in cpufreq-dt-platdev (Bjorn
     Andersson).

   - Make the vexpress cpufreq driver set the CPUFREQ_IS_COOLING_DEV
     flag (Viresh Kumar).

   - Add new cpufreq driver callback to allow drivers to register with
     the Energy Model in a consistent way and make several drivers use
     it (Viresh Kumar).

   - Change the remaining users of the .ready() cpufreq driver callback
     to move the code from it elsewhere and drop it from the cpufreq
     core (Viresh Kumar).

   - Revert recent intel_pstate change adding HWP guaranteed performance
     change notification support to it that led to problems, because the
     notification in question is triggered prematurely on some systems
     (Rafael Wysocki).

   - Convert the OPP DT bindings to DT schema and clean them up while at
     it (Rob Herring)"

* tag 'pm-5.15-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (23 commits)
  Revert "cpufreq: intel_pstate: Process HWP Guaranteed change notification"
  cpufreq: mediatek-hw: Add support for CPUFREQ HW
  cpufreq: Add of_perf_domain_get_sharing_cpumask
  dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW
  cpufreq: Remove ready() callback
  cpufreq: sh: Remove sh_cpufreq_cpu_ready()
  cpufreq: acpi: Remove acpi_cpufreq_cpu_ready()
  cpufreq: qcom-hw: Set dvfs_possible_from_any_cpu cpufreq driver flag
  cpufreq: blocklist more Qualcomm platforms in cpufreq-dt-platdev
  cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support
  cpufreq: scmi: Use .register_em() to register with energy model
  cpufreq: vexpress: Use .register_em() to register with energy model
  cpufreq: scpi: Use .register_em() to register with energy model
  dt-bindings: opp: Convert to DT schema
  dt-bindings: Clean-up OPP binding node names in examples
  ARM: dts: omap: Drop references to opp.txt
  cpufreq: qcom-cpufreq-hw: Use .register_em() to register with energy model
  cpufreq: omap: Use .register_em() to register with energy model
  cpufreq: mediatek: Use .register_em() to register with energy model
  cpufreq: imx6q: Use .register_em() to register with energy model
  ...

Merge tag 'acpi-5.15-rc1-2' of git://git./linux/kernel/git/rafael/linux-pm

Pull more ACPI updates from Rafael Wysocki:
 "These add ACPI support to the PCI VMD driver, improve suspend-to-idle
  support for AMD platforms and update documentation.

  Specifics:

   - Add ACPI support to the PCI VMD driver (Rafael Wysocki)

   - Rearrange suspend-to-idle support code to reflect the platform
     firmware expectations on some AMD platforms (Mario Limonciello)

   - Make SSDT overlays documentation follow the code documented by it
     more closely (Andy Shevchenko)"

* tag 'acpi-5.15-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: PM: s2idle: Run both AMD and Microsoft methods if both are supported
  Documentation: ACPI: Align the SSDT overlays file with the code
  PCI: VMD: ACPI: Make ACPI companion lookup work for VMD bus

Merge tag 'docs-5.15-2' of git://git.lwn.net/linux

Pull more documentation updates from Jonathan Corbet:
 "Another collection of documentation patches, mostly fixes but also
  includes another set of traditional Chinese translations"

* tag 'docs-5.15-2' of git://git.lwn.net/linux:
  docs: pdfdocs: Fix typo in CJK-language specific font settings
  docs: kernel-hacking: Remove inappropriate text
  docs/zh_TW: add translations for zh_TW/filesystems
  docs/zh_TW: add translations for zh_TW/cpu-freq
  docs/zh_TW: add translations for zh_TW/arm64
  docs/zh_CN: Modify the translator tag and fix the wrong word
  Documentation/features/vm: correct huge-vmap APIs
  Documentation: block: blk-mq: Fix small typo in multi-queue docs
  Documentation: in_irq() cleanup
  Documentation: arm: marvell: Add 88F6825 model into list
  Documentation/process/maintainer-pgp-guide: Replace broken link to PGP path finder
  Documentation: locking: fix references
  Documentation: Update details of The Linux Kernel Module Programming Guide
  docs: x86: Remove obsolete information about x86_64 vmalloc() faulting
  Documentation/process/applying-patches: Activate linux-next man hyperlink

Merge tag 'modules-for-v5.15' of git://git./linux/kernel/git/jeyu/linux

Pull module updates from Jessica Yu:
 "The only main change I have for this round of updates is the modules
  MAINTAINERS update.

  As I find myself with less time to devote to upstream these days, Luis
  has kindly agreed to help maintain the module loader, to eventually
  transition to being the primary maintainer. Since Luis is already very
  involved upstream with experience maintaining various areas of the
  kernel including the kmod usermode helper, I think he is a great fit
  for this area of the kernel.

  Summary:

   - Add Luis Chamberlain as modules maintainer

   - Fix for .ctors sections in module linker script"

* tag 'modules-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
  MAINTAINERS: Add Luis Chamberlain as modules maintainer
  module: combine constructors in module linker script

Merge tag 'microblaze-v5.15' of git://git.monstr.eu/linux-2.6-microblaze

Pull microblaze update from Michal Simek:

 - Kbuild clean up

* tag 'microblaze-v5.15' of git://git.monstr.eu/linux-2.6-microblaze:
  microblaze: move core-y in arch/microblaze/Makefile to arch/microblaze/Kbuild

Merge branch 'for-5.15/fsdax-cleanups' into for-5.15/libnvdimm

Include Christoph's rework of the dax_supported() helpers in the v5.15
libnvdimm update. This supports the ongoing dax-reflink enabling effort.

Merge tag 'nfsd-5.15-1' of git://git./linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:

 - Restore performance on memory-starved servers

* tag 'nfsd-5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  SUNRPC: improve error response to over-size gss credential
  SUNRPC: don't pause on incomplete allocation

Merge tag 'ceph-for-5.15-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:

 - a set of patches to address fsync stalls caused by depending on
   periodic rather than triggered MDS journal flushes in some cases
   (Xiubo Li)

 - a fix for mtime effectively not getting updated in case of competing
   writers (Jeff Layton)

 - a couple of fixes for inode reference leaks and various WARNs after
   "umount -f" (Xiubo Li)

 - a new ceph.auth_mds extended attribute (Jeff Layton)

 - a smattering of fixups and cleanups from Jeff, Xiubo and Colin.

* tag 'ceph-for-5.15-rc1' of git://github.com/ceph/ceph-client:
  ceph: fix dereference of null pointer cf
  ceph: drop the mdsc_get_session/put_session dout messages
  ceph: lockdep annotations for try_nonblocking_invalidate
  ceph: don't WARN if we're forcibly removing the session caps
  ceph: don't WARN if we're force umounting
  ceph: remove the capsnaps when removing caps
  ceph: request Fw caps before updating the mtime in ceph_write_iter
  ceph: reconnect to the export targets on new mdsmaps
  ceph: print more information when we can't find snaprealm
  ceph: add ceph_change_snap_realm() helper
  ceph: remove redundant initializations from mdsc and session
  ceph: cancel delayed work instead of flushing on mdsc teardown
  ceph: add a new vxattr to return auth mds for an inode
  ceph: remove some defunct forward declarations
  ceph: flush the mdlog before waiting on unsafe reqs
  ceph: flush mdlog before umounting
  ceph: make iterate_sessions a global symbol
  ceph: make ceph_create_session_msg a global symbol
  ceph: fix comment about short copies in ceph_write_end
  ceph: fix memory leak on decode error in ceph_handle_caps

Merge tag '9p-for-5.15-rc1' of git://github.com/martinetd/linux

Pull 9p updates from Dominique Martinet:
 "A couple of harmless fixes, increase max tcp msize (64KB -> 1MB), and
  increase default msize (8KB -> 128KB)

  The default increase has been discussed with Christian for the qemu
  side of things but makes sense for all supported transports"

* tag '9p-for-5.15-rc1' of git://github.com/martinetd/linux:
  net/9p: increase default msize to 128k
  net/9p: use macro to define default msize
  net/9p: increase tcp max msize to 1MB
  9p/xen: Fix end of loop tests for list_for_each_entry
  9p/trans_virtio: Remove sysfs file on probe failure

arch: remove compat_alloc_user_space

All users of compat_alloc_user_space() and copy_in_user() have been
removed from the kernel, only a few functions in sparc remain that can be
changed to calling arch_copy_in_user() instead.

Link: https://lkml.kernel.org/r/20210727144859.4150043-7-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

compat: remove some compat entry points

These are all handled correctly when calling the native system call entry
point, so remove the special cases.

Link: https://lkml.kernel.org/r/20210727144859.4150043-6-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: simplify compat numa syscalls

The compat implementations for mbind, get_mempolicy, set_mempolicy and
migrate_pages are just there to handle the subtly different layout of
bitmaps on 32-bit hosts.

The compat implementation however lacks some of the checks that are
present in the native one, in particular for checking that the extra bits
are all zero when user space has a larger mask size than the kernel.
Worse, those extra bits do not get cleared when copying in or out of the
kernel, which can lead to incorrect data as well.

Unify the implementation to handle the compat bitmap layout directly in
the get_nodes() and copy_nodes_to_user() helpers.  Splitting out the
get_bitmap() helper from get_nodes() also helps readability of the native
case.

On x86, two additional problems are addressed by this: compat tasks can
pass a bitmap at the end of a mapping, causing a fault when reading across
the page boundary for a 64-bit word.  x32 tasks might also run into
problems with get_mempolicy corrupting data when an odd number of 32-bit
words gets passed.

On parisc the migrate_pages() system call apparently had the wrong calling
convention, as big-endian architectures expect the words inside of a
bitmap to be swapped.  This is not a problem though since parisc has no
NUMA support.

[arnd@arndb.de: fix mempolicy crash]
Link: https://lkml.kernel.org/r/20210730143417.3700653-1-arnd@kernel.org
Link: https://lore.kernel.org/lkml/YQPLG20V3dmOfq3a@osiris/
Link: https://lkml.kernel.org/r/20210727144859.4150043-5-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: simplify compat_sys_move_pages

The compat move_pages() implementation uses compat_alloc_user_space() for
converting the pointer array.  Moving the compat handling into the
function itself is a bit simpler and lets us avoid the
compat_alloc_user_space() call.

Link: https://lkml.kernel.org/r/20210727144859.4150043-4-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kexec: avoid compat_alloc_user_space

kimage_alloc_init() expects a __user pointer, so compat_sys_kexec_load()
uses compat_alloc_user_space() to convert the layout and put it back onto
the user space caller stack.

Moving the user space access into the syscall handler directly actually
makes the code simpler, as the conversion for compat mode can now be done
on kernel memory.

Link: https://lkml.kernel.org/r/20210727144859.4150043-3-arnd@kernel.org
Link: https://lore.kernel.org/lkml/YPbtsU4GX6PL7%2F42@infradead.org/
Link: https://lore.kernel.org/lkml/m1y2cbzmnw.fsf@fess.ebiederm.org/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Co-developed-by: Eric Biederman <ebiederm@xmission.com>
Co-developed-by: Christoph Hellwig <hch@infradead.org>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kexec: move locking into do_kexec_load

Patch series "compat: remove compat_alloc_user_space", v5.

Going through compat_alloc_user_space() to convert indirect system call
arguments tends to add complexity compared to handling the native and
compat logic in the same code.

This patch (of 6):

The locking is the same between the native and compat version of
sys_kexec_load(), so it can be done in the common implementation to reduce
duplication.

Link: https://lkml.kernel.org/r/20210727144859.4150043-1-arnd@kernel.org
Link: https://lkml.kernel.org/r/20210727144859.4150043-2-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Co-developed-by: Eric Biederman <ebiederm@xmission.com>
Co-developed-by: Christoph Hellwig <hch@infradead.org>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: migrate: change to use bool type for 'page_was_mapped'

Change to use bool type for 'page_was_mapped' variable making it more
readable.

Link: https://lkml.kernel.org/r/ce1279df18d2c163998c403e0b5ec6d3f6f90f7a.1629447552.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: migrate: fix the incorrect function name in comments

since commit a98a2f0c8ce1 ("mm/rmap: split migration into its own
function"), the migration ptes establishment has been split into a
separate try_to_migrate() function, thus update the related comments.

Link: https://lkml.kernel.org/r/5b824bad6183259c916ae6cf42f81d14c6118b06.1629447552.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: migrate: introduce a local variable to get the number of pages

Use thp_nr_pages() instead of compound_nr() to get the number of pages for
THP page, meanwhile introducing a local variable 'nr_pages' to avoid
getting the number of pages repeatedly.

Link: https://lkml.kernel.org/r/a8e331ac04392ee230c79186330fb05e86a2aa77.1629447552.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/vmstat: protect per cpu variables with preempt disable on RT

Disable preemption on -RT for the vmstat code.  On vanila the code runs in
IRQ-off regions while on -RT it may not when stats are updated under a
local_lock.  "preempt_disable" ensures that the same resources is not
updated in parallel due to preemption.

This patch differs from the preempt-rt version where __count_vm_event and
__count_vm_events are also protected.  The counters are explicitly
"allowed to be to be racy" so there is no need to protect them from
preemption.  Only the accurate page stats that are updated by a
read-modify-write need protection.  This patch also differs in that a
preempt_[en|dis]able_rt helper is not used.  As vmstat is the only user of
the helper, it was suggested that it be open-coded in vmstat.c instead of
risking the helper being used in unnecessary contexts.

Link: https://lkml.kernel.org/r/20210805160019.1137-2-mgorman@techsingularity.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "147 patches, based on 7d2a07b769330c34b4deabeed939325c77a7ec2f.

  Subsystems affected by this patch series: mm (memory-hotplug, rmap,
  ioremap, highmem, cleanups, secretmem, kfence, damon, and vmscan),
  alpha, percpu, procfs, misc, core-kernel, MAINTAINERS, lib,
  checkpatch, epoll, init, nilfs2, coredump, fork, pids, criu, kconfig,
  selftests, ipc, and scripts"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (94 commits)
  scripts: check_extable: fix typo in user error message
  mm/workingset: correct kernel-doc notations
  ipc: replace costly bailout check in sysvipc_find_ipc()
  selftests/memfd: remove unused variable
  Kconfig.debug: drop selecting non-existing HARDLOCKUP_DETECTOR_ARCH
  configs: remove the obsolete CONFIG_INPUT_POLLDEV
  prctl: allow to setup brk for et_dyn executables
  pid: cleanup the stale comment mentioning pidmap_init().
  kernel/fork.c: unexport get_{mm,task}_exe_file
  coredump: fix memleak in dump_vma_snapshot()
  fs/coredump.c: log if a core dump is aborted due to changed file permissions
  nilfs2: use refcount_dec_and_lock() to fix potential UAF
  nilfs2: fix memory leak in nilfs_sysfs_delete_snapshot_group
  nilfs2: fix memory leak in nilfs_sysfs_create_snapshot_group
  nilfs2: fix memory leak in nilfs_sysfs_delete_##name##_group
  nilfs2: fix memory leak in nilfs_sysfs_create_##name##_group
  nilfs2: fix NULL pointer in nilfs_##name##_attr_release
  nilfs2: fix memory leak in nilfs_sysfs_create_device_group
  trap: cleanup trap_init()
  init: move usermodehelper_enable() to populate_rootfs()
  ...

tracing/boot: Fix to loop on only subkeys

Since the commit e5efaeb8a8f5 ("bootconfig: Support mixing
a value and subkeys under a key") allows to co-exist a value
node and key nodes under a node, xbc_node_for_each_child()
is not only returning key node but also a value node.
In the boot-time tracing using xbc_node_for_each_child() to
iterate the events, groups and instances, but those must be
key nodes. Thus it must use xbc_node_for_each_subkey().

Link: https://lkml.kernel.org/r/163112988361.74896.2267026262061819145.stgit@devnote2
Fixes: e5efaeb8a8f5 ("bootconfig: Support mixing a value and subkeys under a key")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

Merge tag 'mm-slub-5.15-rc1' of git://git./linux/kernel/git/vbabka/linux

Pull SLUB updates from Vlastimil Babka:
 "SLUB: reduce irq disabled scope and make it RT compatible

  This series was initially inspired by Mel's pcplist local_lock
  rewrite, and also interest to better understand SLUB's locking and the
  new primitives and RT variants and implications. It makes SLUB
  compatible with PREEMPT_RT and generally more preemption-friendly,
  apparently without significant regressions, as the fast paths are not
  affected.

  The main changes to SLUB by this series:

   - irq disabling is now only done for minimum amount of time needed to
     protect the strict kmem_cache_cpu fields, and as part of spin lock,
     local lock and bit lock operations to make them irq-safe

   - SLUB is fully PREEMPT_RT compatible

  The series should now be sufficiently tested in both RT and !RT
  configs, mainly thanks to Mike.

  The RFC/v1 version also got basic performance screening by Mel that
  didn't show major regressions. Mike's testing with hackbench of v2 on
  !RT reported negligible differences [6]:

    virgin(ish) tip
    5.13.0.g60ab3ed-tip
              7,320.67 msec task-clock                #    7.792 CPUs utilized            ( +-  0.31% )
               221,215      context-switches          #    0.030 M/sec                    ( +-  3.97% )
                16,234      cpu-migrations            #    0.002 M/sec                    ( +-  4.07% )
                13,233      page-faults               #    0.002 M/sec                    ( +-  0.91% )
        27,592,205,252      cycles                    #    3.769 GHz                      ( +-  0.32% )
         8,309,495,040      instructions              #    0.30  insn per cycle           ( +-  0.37% )
         1,555,210,607      branches                  #  212.441 M/sec                    ( +-  0.42% )
             5,484,209      branch-misses             #    0.35% of all branches          ( +-  2.13% )

               0.93949 +- 0.00423 seconds time elapsed  ( +-  0.45% )
               0.94608 +- 0.00384 seconds time elapsed  ( +-  0.41% ) (repeat)
               0.94422 +- 0.00410 seconds time elapsed  ( +-  0.43% )

    5.13.0.g60ab3ed-tip +slub-local-lock-v2r3
              7,343.57 msec task-clock                #    7.776 CPUs utilized            ( +-  0.44% )
               223,044      context-switches          #    0.030 M/sec                    ( +-  3.02% )
                16,057      cpu-migrations            #    0.002 M/sec                    ( +-  4.03% )
                13,164      page-faults               #    0.002 M/sec                    ( +-  0.97% )
        27,684,906,017      cycles                    #    3.770 GHz                      ( +-  0.45% )
         8,323,273,871      instructions              #    0.30  insn per cycle           ( +-  0.28% )
         1,556,106,680      branches                  #  211.901 M/sec                    ( +-  0.31% )
             5,463,468      branch-misses             #    0.35% of all branches          ( +-  1.33% )

               0.94440 +- 0.00352 seconds time elapsed  ( +-  0.37% )
               0.94830 +- 0.00228 seconds time elapsed  ( +-  0.24% ) (repeat)
               0.93813 +- 0.00440 seconds time elapsed  ( +-  0.47% ) (repeat)

  RT configs showed some throughput regressions, but that's expected
  tradeoff for the preemption improvements through the RT mutex. It
  didn't prevent the v2 to be incorporated to the 5.13 RT tree [7],
  leading to testing exposure and bugfixes.

  Before the series, SLUB is lockless in both allocation and free fast
  paths, but elsewhere, it's disabling irqs for considerable periods of
  time - especially in allocation slowpath and the bulk allocation,
  where IRQs are re-enabled only when a new page from the page allocator
  is needed, and the context allows blocking. The irq disabled sections
  can then include deactivate_slab() which walks a full freelist and
  frees the slab back to page allocator or unfreeze_partials() going
  through a list of percpu partial slabs. The RT tree currently has some
  patches mitigating these, but we can do much better in mainline too.

  Patches 1-6 are straightforward improvements or cleanups that could
  exist outside of this series too, but are prerequsities.

  Patches 7-9 are also preparatory code changes without functional
  changes, but not so useful without the rest of the series.

  Patch 10 simplifies the fast paths on systems with preemption, based
  on (hopefully correct) observation that the current loops to verify
  tid are unnecessary.

  Patches 11-20 focus on reducing irq disabled scope in the allocation
  slowpath:

   - patch 11 moves disabling of irqs into ___slab_alloc() from its
     callers, which are the allocation slowpath, and bulk allocation.
     Instead these callers only disable preemption to stabilize the cpu.

   - The following patches then gradually reduce the scope of disabled
     irqs in ___slab_alloc() and the functions called from there. As of
     patch 14, the re-enabling of irqs based on gfp flags before calling
     the page allocator is removed from allocate_slab(). As of patch 17,
     it's possible to reach the page allocator (in case of existing
     slabs depleted) without disabling and re-enabling irqs a single
     time.

  Pathces 21-26 reduce the scope of disabled irqs in functions related
  to unfreezing percpu partial slab.

  Patch 27 is preparatory. Patch 28 is adopted from the RT tree and
  converts the flushing of percpu slabs on all cpus from using IPI to
  workqueue, so that the processing isn't happening with irqs disabled
  in the IPI handler. The flushing is not performance critical so it
  should be acceptable.

  Patch 29 also comes from RT tree and makes object_map_lock RT
  compatible.

  Patch 30 make slab_lock irq-safe on RT where we cannot rely on having
  irq disabled from the list_lock spin lock usage.

  Patch 31 changes kmem_cache_cpu->partial handling in put_cpu_partial()
  from cmpxchg loop to a short irq disabled section, which is used by
  all other code modifying the field. This addresses a theoretical race
  scenario pointed out by Jann, and makes the critical section safe wrt
  with RT local_lock semantics after the conversion in patch 35.

  Patch 32 changes preempt disable to migrate disable, so that the
  nested list_lock spinlock is safe to take on RT. Because
  migrate_disable() is a function call even on !RT, a small set of
  private wrappers is introduced to keep using the cheaper
  preempt_disable() on !PREEMPT_RT configurations. As of this patch,
  SLUB should be already compatible with RT's lock semantics.

  Finally, patch 33 changes irq disabled sections that protect
  kmem_cache_cpu fields in the slow paths, with a local lock. However on
  PREEMPT_RT it means the lockless fast paths can now preempt slow paths
  which don't expect that, so the local lock has to be taken also in the
  fast paths and they are no longer lockless. RT folks seem to not mind
  this tradeoff. The patch also updates the locking documentation in the
  file's comment"

Mike Galbraith and Mel Gorman verified that their earlier testing
observations still hold for the final series:

Link: https://lore.kernel.org/lkml/89ba4f783114520c167cc915ba949ad2c04d6790.camel@gmx.de/
Link: https://lore.kernel.org/lkml/20210907082010.GB3959@techsingularity.net/
* tag 'mm-slub-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux: (33 commits)
  mm, slub: convert kmem_cpu_slab protection to local_lock
  mm, slub: use migrate_disable() on PREEMPT_RT
  mm, slub: protect put_cpu_partial() with disabled irqs instead of cmpxchg
  mm, slub: make slab_lock() disable irqs with PREEMPT_RT
  mm: slub: make object_map_lock a raw_spinlock_t
  mm: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context
  mm, slab: split out the cpu offline variant of flush_slab()
  mm, slub: don't disable irqs in slub_cpu_dead()
  mm, slub: only disable irq with spin_lock in __unfreeze_partials()
  mm, slub: separate detaching of partial list in unfreeze_partials() from unfreezing
  mm, slub: detach whole partial list at once in unfreeze_partials()
  mm, slub: discard slabs in unfreeze_partials() without irqs disabled
  mm, slub: move irq control into unfreeze_partials()
  mm, slub: call deactivate_slab() without disabling irqs
  mm, slub: make locking in deactivate_slab() irq-safe
  mm, slub: move reset of c->page and freelist out of deactivate_slab()
  mm, slub: stop disabling irqs around get_partial()
  mm, slub: check new pages with restored irqs
  mm, slub: validate slab from partial list or page allocator before making it cpu slab
  mm, slub: restore irqs around calling new_slab()
  ...

selftests/ftrace: Exclude "(fault)" in testing add/remove eprobe events

The original test for adding and removing eprobes used synthetic events
and retrieved the filename from the open system call at the end of the
system call. This would allow it to always be loaded into the page tables
when accessed.

Masami suggested that the test was too complex for just testing add and
remove, so it was changed to test just adding and removing an event probe
on top of the start of the open system call event. Now it is possible that
the filename will not be loaded into memory at the time the eprobe is
triggered, and will result in "(fault)" being displayed in the event. This
causes the test to fail.

Account for "(fault)" also being one of the values of the filename field
of the event probe.

Link: https://lkml.kernel.org/r/20210907230429.5783d519@rorschach.local.home
Fixes: 079db70794ec5 ("selftests/ftrace: Add test case to test adding and removing of event probe")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tracing: Dynamically allocate the per-elt hist_elt_data array

Setting the hist_elt_data.field_var_str[] array unconditionally to a
size of SYNTH_FIELD_MAX elements wastes space unnecessarily.  The
actual number of elements needed can be calculated at run-time
instead.

In most cases, this will save a lot of space since it's a per-elt
array which isn't normally close to being full.  It also allows us to
increase SYNTH_FIELD_MAX without worrying about even more wastage when
we do that.

Link: https://lkml.kernel.org/r/d52ae0ad5e1b59af7c4f54faf3fc098461fd82b3.camel@kernel.org
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tracing: synth events: increase max fields count

Sometimes it is useful to construct larger synthetic trace events. Increase
'SYNTH_FIELDS_MAX' (maximum number of fields in a synthetic event) from 32 to
64.

Link: https://lkml.kernel.org/r/20210901135513.3087062-1-dedekind1@gmail.com
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Acked-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/bootconfig: Show whole test command for each test case

Show whole test command instead of only the 3rd argument.
This will clear to show what will be actually tested by
each test case.

Link: https://lkml.kernel.org/r/163077088607.222577.14786016266462495017.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

bootconfig: Fix missing return check of xbc_node_compose_key function

The function `xbc_show_list should` handle the keys during the
composition. Even the errors returned by the compose function. Instead
of removing the `ret` variable, it should save the value and show the
exact error. This missing variable is causing a compilation issue also.

Link: https://lkml.kernel.org/r/163077087861.222577.12884543474750968146.stgit@devnote2
Fixes: e5efaeb8a8f5 ("bootconfig: Support mixing a value and subkeys under a key")
Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/bootconfig: Fix tracing_on option checking in ftrace2bconf.sh

Since tracing_on indicates only "1" (default) or "0", ftrace2bconf.sh
only need to check the value is "0".

Link: https://lkml.kernel.org/r/163077087144.222577.6888011847727968737.stgit@devnote2
Fixes: 55ed4560774d ("tools/bootconfig: Add tracing_on support to helper scripts")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

docs: bootconfig: Add how to use bootconfig for kernel parameters

Add a section to describe how to use the bootconfig for
specifying kernel and init parameters. This is an important
section because it is the reason why this document is under
the admin-guide.

Link: https://lkml.kernel.org/r/163077086399.222577.5881779375643977991.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

init/bootconfig: Reorder init parameter from bootconfig and cmdline

Reorder the init parameters from bootconfig and kernel cmdline
so that the kernel cmdline always be the last part of the
parameters as below.

 " -- "[bootconfig init params][cmdline init params]

This change will help us to prevent that bootconfig init params
overwrite the init params which user gives in the command line.

Link: https://lkml.kernel.org/r/163077085675.222577.5665176468023636160.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

init: bootconfig: Remove all bootconfig data when the init memory is removed

Since the bootconfig is used only in the init functions,
it doesn't need to keep the data after boot. Free it when
the init memory is removed.

Link: https://lkml.kernel.org/r/163077084958.222577.5924961258513004428.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tracing/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()

When start_kthread() return error, the cpus_read_unlock() need
to be called.

Link: https://lkml.kernel.org/r/20210831022919.27630-1-qiang.zhang@windriver.com
Cc: <stable@vger.kernel.org>
Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Qiang.Zhang <qiang.zhang@windriver.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

scripts: check_extable: fix typo in user error message

Fix typo ("and" should be "an") in an error message.

Link: https://lkml.kernel.org/r/20210727002943.29774-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/workingset: correct kernel-doc notations

Use the documented kernel-doc format to prevent kernel-doc warnings.

mm/workingset.c:256: warning: No description found for return value of 'workingset_eviction'
mm/workingset.c:285: warning: Function parameter or member 'folio' not described in 'workingset_refault'
mm/workingset.c:285: warning: Excess function parameter 'page' description in 'workingset_refault'

Link: https://lkml.kernel.org/r/20210808203153.10678-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ipc: replace costly bailout check in sysvipc_find_ipc()

sysvipc_find_ipc() was left with a costly way to check if the offset
position fed to it is bigger than the total number of IPC IDs in use.  So
much so that the time it takes to iterate over /proc/sysvipc/* files grows
exponentially for a custom benchmark that creates "N" SYSV shm segments
and then times the read of /proc/sysvipc/shm (milliseconds):

    12 msecs to read   1024 segs from /proc/sysvipc/shm
    18 msecs to read   2048 segs from /proc/sysvipc/shm
    65 msecs to read   4096 segs from /proc/sysvipc/shm
   325 msecs to read   8192 segs from /proc/sysvipc/shm
  1303 msecs to read  16384 segs from /proc/sysvipc/shm
  5182 msecs to read  32768 segs from /proc/sysvipc/shm

The root problem lies with the loop that computes the total amount of ids
in use to check if the "pos" feeded to sysvipc_find_ipc() grew bigger than
"ids->in_use".  That is a quite inneficient way to get to the maximum
index in the id lookup table, specially when that value is already
provided by struct ipc_ids.max_idx.

This patch follows up on the optimization introduced via commit
15df03c879836 ("sysvipc: make get_maxid O(1) again") and gets rid of the
aforementioned costly loop replacing it by a simpler checkpoint based on
ipc_get_maxidx() returned value, which allows for a smooth linear increase
in time complexity for the same custom benchmark:

     2 msecs to read   1024 segs from /proc/sysvipc/shm
     2 msecs to read   2048 segs from /proc/sysvipc/shm
     4 msecs to read   4096 segs from /proc/sysvipc/shm
     9 msecs to read   8192 segs from /proc/sysvipc/shm
    19 msecs to read  16384 segs from /proc/sysvipc/shm
    39 msecs to read  32768 segs from /proc/sysvipc/shm

Link: https://lkml.kernel.org/r/20210809203554.1562989-1-aquini@redhat.com
Signed-off-by: Rafael Aquini <aquini@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Acked-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Waiman Long <llong@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

selftests/memfd: remove unused variable

Commit 544029862cbb ("selftests/memfd: add tests for F_SEAL_FUTURE_WRITE
seal") added an unused variable to mfd_assert_reopen_fd().

Delete the unused variable.

Link: https://lkml.kernel.org/r/20210702045509.1517643-1-gthelen@google.com
Fixes: 544029862cbb ("selftests/memfd: add tests for F_SEAL_FUTURE_WRITE seal")
Signed-off-by: Greg Thelen <gthelen@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Joel Fernandes (Google)" <joel@joelfernandes.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Kconfig.debug: drop selecting non-existing HARDLOCKUP_DETECTOR_ARCH

Commit 05a4a9527931 ("kernel/watchdog: split up config options") adds a
new config HARDLOCKUP_DETECTOR, which selects the non-existing config
HARDLOCKUP_DETECTOR_ARCH.

Hence, ./scripts/checkkconfigsymbols.py warns:

HARDLOCKUP_DETECTOR_ARCH Referencing files: lib/Kconfig.debug

Simply drop selecting the non-existing HARDLOCKUP_DETECTOR_ARCH.

Link: https://lkml.kernel.org/r/20210806115618.22088-1-lukas.bulwahn@gmail.com
Fixes: 05a4a9527931 ("kernel/watchdog: split up config options")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Babu Moger <babu.moger@oracle.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

configs: remove the obsolete CONFIG_INPUT_POLLDEV

This CONFIG option was removed in commit 278b13ce3a89 ("Input: remove
input_polled_dev implementation") so there's no point to keep it in
defconfigs any longer.

Get rid of the leftover for all arches.

Link: https://lkml.kernel.org/r/20210726074741.1062-1-yuzenghui@huawei.com
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

prctl: allow to setup brk for et_dyn executables

Keno Fischer reported that when a binray loaded via ld-linux-x the
prctl(PR_SET_MM_MAP) doesn't allow to setup brk value because it lays
before mm:end_data.

For example a test program shows

 | # ~/t
 |
 | start_code      401000
 | end_code        401a15
 | start_stack     7ffce4577dd0
 | start_data    403e10
 | end_data        40408c
 | start_brk    b5b000
 | sbrk(0)         b5b000

and when executed via ld-linux

 | # /lib64/ld-linux-x86-64.so.2 ~/t
 |
 | start_code      7fc25b0a4000
 | end_code        7fc25b0c4524
 | start_stack     7fffcc6b2400
 | start_data    7fc25b0ce4c0
 | end_data        7fc25b0cff98
 | start_brk    55555710c000
 | sbrk(0)         55555710c000

This of course prevent criu from restoring such programs.  Looking into
how kernel operates with brk/start_brk inside brk() syscall I don't see
any problem if we allow to setup brk/start_brk without checking for
end_data.  Even if someone pass some weird address here on a purpose then
the worst possible result will be an unexpected unmapping of existing vma
(own vma, since prctl works with the callers memory) but test for
RLIMIT_DATA is still valid and a user won't be able to gain more memory in
case of expanding VMAs via new values shipped with prctl call.

Link: https://lkml.kernel.org/r/20210121221207.GB2174@grain
Fixes: bbdc6076d2e5 ("binfmt_elf: move brk out of mmap when doing direct loader exec")
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reported-by: Keno Fischer <keno@juliacomputing.com>
Acked-by: Andrey Vagin <avagin@gmail.com>
Tested-by: Andrey Vagin <avagin@gmail.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Cc: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

pid: cleanup the stale comment mentioning pidmap_init().

pidmap_init() has already been replaced with pid_idr_init() in the commit
95846ecf9dac ("pid: replace pid bitmap implementation with IDR API").
Cleanup the stale comment which still mentions it.

Link: https://lkml.kernel.org/r/20210714120713.19825-1-itazur@amazon.com
Signed-off-by: Takahiro Itazuri <itazur@amazon.com>
Cc: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/fork.c: unexport get_{mm,task}_exe_file

Only used by core code and the tomoyo which can't be a module either.

Link: https://lkml.kernel.org/r/20210820095430.445242-1-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

coredump: fix memleak in dump_vma_snapshot()

dump_vma_snapshot() allocs memory for *vma_meta, when dump_vma_snapshot()
returns -EFAULT, the memory will be leaked, so we free it correctly.

Link: https://lkml.kernel.org/r/20210810020441.62806-1-qiuxi1@huawei.com
Fixes: a07279c9a8cd7 ("binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot")
Signed-off-by: QiuXi <qiuxi1@huawei.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jann Horn <jannh@google.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>

fs/coredump.c: log if a core dump is aborted due to changed file permissions

For obvious security reasons, a core dump is aborted if the filesystem
cannot preserve ownership or permissions of the dump file.

This affects filesystems like e.g.  vfat, but also something like a 9pfs
share in a Qemu test setup, running as a regular user, depending on the
security model used.  In those cases, the result is an empty core file and
a confused user.

To hopefully save other people a lot of time figuring out the cause, this
patch adds a simple log message for those specific cases.

[akpm@linux-foundation.org: s/|%s/%s/ in printk text]

Link: https://lkml.kernel.org/r/20210701233151.102720-1-david.oberhollenzer@sigma-star.at
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: use refcount_dec_and_lock() to fix potential UAF

When the refcount is decreased to 0, the resource reclamation branch is
entered.  Before CPU0 reaches the race point (1), CPU1 may obtain the
spinlock and traverse the rbtree to find 'root', see
nilfs_lookup_root().

Although CPU1 will call refcount_inc() to increase the refcount, it is
obviously too late.  CPU0 will release 'root' directly, CPU1 then
accesses 'root' and triggers UAF.

Use refcount_dec_and_lock() to ensure that both the operations of
decrease refcount to 0 and link deletion are lock protected eliminates
this risk.

     CPU0                      CPU1
nilfs_put_root():
    <-------- (1)
spin_lock(&nilfs->ns_cptree_lock);
rb_erase(&root->rb_node, &nilfs->ns_cptree);
spin_unlock(&nilfs->ns_cptree_lock);

kfree(root);
    <-------- use-after-free

  refcount_t: underflow; use-after-free.
  WARNING: CPU: 2 PID: 9476 at lib/refcount.c:28 \
  refcount_warn_saturate+0x1cf/0x210 lib/refcount.c:28
  Modules linked in:
  CPU: 2 PID: 9476 Comm: syz-executor.0 Not tainted 5.10.45-rc1+ #3
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), ...
  RIP: 0010:refcount_warn_saturate+0x1cf/0x210 lib/refcount.c:28
  ... ...
  Call Trace:
     __refcount_sub_and_test include/linux/refcount.h:283 [inline]
     __refcount_dec_and_test include/linux/refcount.h:315 [inline]
     refcount_dec_and_test include/linux/refcount.h:333 [inline]
     nilfs_put_root+0xc1/0xd0 fs/nilfs2/the_nilfs.c:795
     nilfs_segctor_destroy fs/nilfs2/segment.c:2749 [inline]
     nilfs_detach_log_writer+0x3fa/0x570 fs/nilfs2/segment.c:2812
     nilfs_put_super+0x2f/0xf0 fs/nilfs2/super.c:467
     generic_shutdown_super+0xcd/0x1f0 fs/super.c:464
     kill_block_super+0x4a/0x90 fs/super.c:1446
     deactivate_locked_super+0x6a/0xb0 fs/super.c:335
     deactivate_super+0x85/0x90 fs/super.c:366
     cleanup_mnt+0x277/0x2e0 fs/namespace.c:1118
     __cleanup_mnt+0x15/0x20 fs/namespace.c:1125
     task_work_run+0x8e/0x110 kernel/task_work.c:151
     tracehook_notify_resume include/linux/tracehook.h:188 [inline]
     exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
     exit_to_user_mode_prepare+0x13c/0x170 kernel/entry/common.c:191
     syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
     do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
     entry_SYSCALL_64_after_hwframe+0x44/0xa9

There is no reproduction program, and the above is only theoretical
analysis.

Link: https://lkml.kernel.org/r/1629859428-5906-1-git-send-email-konishi.ryusuke@gmail.com
Fixes: ba65ae4729bf ("nilfs2: add checkpoint tree to nilfs object")
Link: https://lkml.kernel.org/r/20210723012317.4146-1-thunder.leizhen@huawei.com
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: fix memory leak in nilfs_sysfs_delete_snapshot_group

kobject_put() should be used to cleanup the memory associated with the
kobject instead of kobject_del().  See the section "Kobject removal" of
"Documentation/core-api/kobject.rst".

Link: https://lkml.kernel.org/r/20210629022556.3985106-7-sunnanyong@huawei.com
Link: https://lkml.kernel.org/r/1625651306-10829-7-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: fix memory leak in nilfs_sysfs_create_snapshot_group

If kobject_init_and_add returns with error, kobject_put() is needed here
to avoid memory leak, because kobject_init_and_add may return error
without freeing the memory associated with the kobject it allocated.

Link: https://lkml.kernel.org/r/20210629022556.3985106-6-sunnanyong@huawei.com
Link: https://lkml.kernel.org/r/1625651306-10829-6-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: fix memory leak in nilfs_sysfs_delete_##name##_group

The kobject_put() should be used to cleanup the memory associated with the
kobject instead of kobject_del.  See the section "Kobject removal" of
"Documentation/core-api/kobject.rst".

Link: https://lkml.kernel.org/r/20210629022556.3985106-5-sunnanyong@huawei.com
Link: https://lkml.kernel.org/r/1625651306-10829-5-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: fix memory leak in nilfs_sysfs_create_##name##_group

If kobject_init_and_add return with error, kobject_put() is needed here to
avoid memory leak, because kobject_init_and_add may return error without
freeing the memory associated with the kobject it allocated.

Link: https://lkml.kernel.org/r/20210629022556.3985106-4-sunnanyong@huawei.com
Link: https://lkml.kernel.org/r/1625651306-10829-4-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: fix NULL pointer in nilfs_##name##_attr_release

In nilfs_##name##_attr_release, kobj->parent should not be referenced
because it is a NULL pointer.  The release() method of kobject is always
called in kobject_put(kobj), in the implementation of kobject_put(), the
kobj->parent will be assigned as NULL before call the release() method.
So just use kobj to get the subgroups, which is more efficient and can fix
a NULL pointer reference problem.

Link: https://lkml.kernel.org/r/20210629022556.3985106-3-sunnanyong@huawei.com
Link: https://lkml.kernel.org/r/1625651306-10829-3-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

nilfs2: fix memory leak in nilfs_sysfs_create_device_group

Patch series "nilfs2: fix incorrect usage of kobject".

This patchset from Nanyong Sun fixes memory leak issues and a NULL
pointer dereference issue caused by incorrect usage of kboject in nilfs2
sysfs implementation.

This patch (of 6):

Reported by syzkaller:

  BUG: memory leak
  unreferenced object 0xffff888100ca8988 (size 8):
  comm "syz-executor.1", pid 1930, jiffies 4294745569 (age 18.052s)
  hex dump (first 8 bytes):
  6c 6f 6f 70 31 00 ff ff loop1...
  backtrace:
    kstrdup+0x36/0x70 mm/util.c:60
    kstrdup_const+0x35/0x60 mm/util.c:83
    kvasprintf_const+0xf1/0x180 lib/kasprintf.c:48
    kobject_set_name_vargs+0x56/0x150 lib/kobject.c:289
    kobject_add_varg lib/kobject.c:384 [inline]
    kobject_init_and_add+0xc9/0x150 lib/kobject.c:473
    nilfs_sysfs_create_device_group+0x150/0x7d0 fs/nilfs2/sysfs.c:986
    init_nilfs+0xa21/0xea0 fs/nilfs2/the_nilfs.c:637
    nilfs_fill_super fs/nilfs2/super.c:1046 [inline]
    nilfs_mount+0x7b4/0xe80 fs/nilfs2/super.c:1316
    legacy_get_tree+0x105/0x210 fs/fs_context.c:592
    vfs_get_tree+0x8e/0x2d0 fs/super.c:1498
    do_new_mount fs/namespace.c:2905 [inline]
    path_mount+0xf9b/0x1990 fs/namespace.c:3235
    do_mount+0xea/0x100 fs/namespace.c:3248
    __do_sys_mount fs/namespace.c:3456 [inline]
    __se_sys_mount fs/namespace.c:3433 [inline]
    __x64_sys_mount+0x14b/0x1f0 fs/namespace.c:3433
    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
    entry_SYSCALL_64_after_hwframe+0x44/0xae

If kobject_init_and_add return with error, then the cleanup of kobject
is needed because memory may be allocated in kobject_init_and_add
without freeing.

And the place of cleanup_dev_kobject should use kobject_put to free the
memory associated with the kobject.  As the section "Kobject removal" of
"Documentation/core-api/kobject.rst" says, kobject_del() just makes the
kobject "invisible", but it is not cleaned up.  And no more cleanup will
do after cleanup_dev_kobject, so kobject_put is needed here.

Link: https://lkml.kernel.org/r/1625651306-10829-1-git-send-email-konishi.ryusuke@gmail.com
Link: https://lkml.kernel.org/r/1625651306-10829-2-git-send-email-konishi.ryusuke@gmail.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Link: https://lkml.kernel.org/r/20210629022556.3985106-2-sunnanyong@huawei.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

trap: cleanup trap_init()

There are some empty trap_init() definitions in different ARCHs, Introduce
a new weak trap_init() function to clean them up.

Link: https://lkml.kernel.org/r/20210812123602.76356-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> [arm32]
Acked-by: Vineet Gupta [arc]
Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc]
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Stafford Horne <shorne@gmail.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <palmerdabbelt@google.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

init: move usermodehelper_enable() to populate_rootfs()

Currently, usermodehelper is enabled right before PID1 starts going
through the initcalls. However, any call of a usermodehelper from a
pure_, core_, postcore_, arch_, subsys_ or fs_ initcall is futile, as
there is no filesystem contents yet.

Up until commit e7cb072eb988 ("init/initramfs.c: do unpacking
asynchronously"), such calls, whether via some request_module(), a
legacy uevent "/sbin/hotplug" notification or something else, would
just fail silently with (presumably) -ENOENT from
kernel_execve(). However, that commit introduced the
wait_for_initramfs() synchronization hook which must be called from
the usermodehelper exec path right before the kernel_execve, in order
that request_module() et al done from *after* rootfs_initcall()
time (i.e. device_ and late_ initcalls) would continue to find a
populated initramfs as they used to.

Any call of wait_for_initramfs() done before the unpacking has been
scheduled (i.e. before rootfs_initcall time) must just return
immediately [and let the caller find an empty file system] in order
not to deadlock the machine. I mistakenly thought, and my limited
testing confirmed, that there were no such calls, so I added a
pr_warn_once() in wait_for_initramfs(). It turns out that one can
indeed hit request_module() as well as kobject_uevent_env() during
those early init calls, leading to a user-visible warning in the
kernel log emitted consistently for certain configurations.

We could just remove the pr_warn_once(), but I think it's better to
postpone enabling the usermodehelper framework until there is at least
some chance of finding the executable. That is also a little more
efficient in that a lot of work done in umh.c will be elided. However,
it does change the error seen by those early callers from -ENOENT to
-EBUSY, so there is a risk of a regression if any caller care about
the exact error value.

Link: https://lkml.kernel.org/r/20210728134638.329060-1-linux@rasmusvillemoes.dk
Fixes: e7cb072eb988 ("init/initramfs.c: do unpacking asynchronously")
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reported-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reported-by: Bruno Goncalves <bgoncalv@redhat.com>
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/epoll: use a per-cpu counter for user's watches count

This counter tracks the number of watches a user has, to compare against
the 'max_user_watches' limit. This causes a scalability bottleneck on
SPECjbb2015 on large systems as there is only one user. Changing to a
per-cpu counter increases throughput of the benchmark by about 30% on a
16-socket, > 1000 thread system.

[rdunlap@infradead.org: fix build errors in kernel/user.c when CONFIG_EPOLL=n]
[npiggin@gmail.com: move ifdefs into wrapper functions, slightly improve panic message]
Link: https://lkml.kernel.org/r/1628051945.fens3r99ox.astroid@bobo.none
[akpm@linux-foundation.org: tweak user_epoll_alloc(), per Guenter]
Link: https://lkml.kernel.org/r/20210804191421.GA1900577@roeck-us.net
Link: https://lkml.kernel.org/r/20210802032013.2751916-1-npiggin@gmail.com
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reported-by: Anton Blanchard <anton@ozlabs.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

checkpatch: improve GIT_COMMIT_ID test

The preferred git commit id reference has the form

commit <SHA-1> ("Title line")

where SHA-1 is the commit hex hash with a minimum lenth of 12 and ("Title
line") is the complete title line of the commit with a (" prefix and ")
suffix.

The current tests fail when the "Title line" has one or more embedded
double quotes.

Improve the test that finds the commit SHA-1 hex hash then ("Title line")
by using $balanced_parens for a maximum of 3 consecutive lines.

[akpm@linux-foundation.org: add missing &&]

Link: https://lkml.kernel.org/r/976c6cdd680db4b55ae31b5fc2d1779da5c0dc66.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Denis Efremov <efremov@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

checkpatch: make email address check case insensitive

Instead of checkpatch requiring the patch author to exactly match the
signed-off-by tag, commit 48ca2d8ac8a1 ("checkpatch: add new warnings to
author signoff checks.") safely relaxed this requirement.

Although the local-part of an email address (local-part@domain), may be
case sensitive, exploiting the case sensitivity of mailbox local-parts
impedes interoperability and is discouraged.  Mailbox domains follow
normal DNS rules and are hence not case sensitive.  (Refer to
https://datatracker.ietf.org/doc/html/rfc5321#section-2.4.)

Further relax the patch author and signed-off-by tag comparison by making
the email address check case insensitive.

Link: https://lkml.kernel.org/r/20210816112725.173206-1-zohar@linux.ibm.com
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

checkpatch: support wide strings

Allow prefixing typical strings with L for wide strings and u for unicode
strings.

Link: https://lkml.kernel.org/r/20210801170733.1.I3f9784fd3c1007d08ec2e70b151d137687575495@changeid
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tools: rename bitmap_alloc() to bitmap_zalloc()

Rename bitmap_alloc() to bitmap_zalloc() in tools to follow the bitmap API
in the kernel.

No functional changes intended.

Link: https://lkml.kernel.org/r/20210814211713.180533-14-yury.norov@gmail.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Suggested-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Lobakin <alobakin@pm.me>
Cc: Alexey Klimov <aklimov@redhat.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/iov_iter.c: fix kernel-doc warnings

Fix all kernel-doc warnings in lib/iov_iter.c:

lib/iov_iter.c:695: warning: Function parameter or member 'i' not described in '_copy_mc_to_iter'
lib/iov_iter.c:695: warning: Excess function parameter 'iter' description in '_copy_mc_to_iter'
lib/iov_iter.c:695: warning: No description found for return value of '_copy_mc_to_iter'
lib/iov_iter.c:758: warning: Function parameter or member 'i' not described in '_copy_from_iter_flushcache'
lib/iov_iter.c:758: warning: Excess function parameter 'iter' description in '_copy_from_iter_flushcache'
lib/iov_iter.c:758: warning: No description found for return value of '_copy_from_iter_flushcache'

Link: https://lkml.kernel.org/r/20210809051053.6531-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/dump_stack: correct kernel-doc notation

Fix kernel-doc warnings in dump_stack.c:

lib/dump_stack.c:97: warning: Function parameter or member 'log_lvl' not described in 'dump_stack_lvl'
lib/dump_stack.c:97: warning: expecting prototype for dump_stack(). Prototype was for dump_stack_lvl() instead

Link: https://lkml.kernel.org/r/20210809051643.17567-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/test: convert test_sort.c to use KUnit

This follows up commit ebd09577be6c ("lib/test: convert
lib/test_list_sort.c to use KUnit").

Converting this test to KUnit makes the test a bit shorter, standardizes
how it reports pass/fail, and adds an easier way to run the test [1].

Like ebd09577be6c, this leaves the file and Kconfig option name the same,
but slightly changes their dependencies (needs CONFIG_KUNIT).

[1] Can be run via
$ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
CONFIG_KUNIT=y
CONFIG_TEST_SORT=y
EOF

[11:30:27] Starting KUnit Kernel ...
[11:30:30] ============================================================
[11:30:30] ======== [PASSED] lib_sort ========
[11:30:30] [PASSED] test_sort
[11:30:30] ============================================================
[11:30:30] Testing complete. 1 tests run. 0 failed. 0 crashed. 0 skipped.
[11:30:30] Elapsed time: 37.032s total, 0.001s configuring, 34.090s building, 0.000s running

Note: this is the time it took after a `make mrproper`.

With an incremental rebuild, this looks more like:
[11:38:58] Elapsed time: 6.444s total, 0.001s configuring, 3.416s building, 0.000s running

Since the test has no dependencies, it can also be run (with some other
tests) with just:
$ ./tools/testing/kunit/kunit.py run

Link: https://lkml.kernel.org/r/20210715232441.1380885-1-dlatypov@google.com
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Cc: Pravin Shedge <pravin.shedge4linux@gmail.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

math: RATIONAL_KUNIT_TEST should depend on RATIONAL instead of selecting it

RATIONAL_KUNIT_TEST selects RATIONAL, thus enabling an optional feature
the user may not want to have enabled.  Fix this by making the test depend
on RATIONAL instead.

Link: https://lkml.kernel.org/r/20210706100945.3803694-3-geert@linux-m68k.org
Fixes: b6c75c4afceb8bc0 ("lib/math/rational: add Kunit test cases")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Trent Piepho <tpiepho@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

math: make RATIONAL tristate

Patch series "math: RATIONAL and RATIONAL_KUNIT_TEST improvements".

This series makes the RATIONAL symbol tristate, so it is not forced
builtin if all users are modular, and makes the RATIONAL_KUNIT_TEST depend
on RATIONAL, to avoid enabling RATIONAL if there are no real users.

This patch (of 2):

All but one symbols that select RATIONAL are tristate, but RATIONAL itself
is bool.  Change it to tristate, so the rational fractions support code
can be modular if no builtin code relies on it.

Link: https://lkml.kernel.org/r/20210706100945.3803694-1-geert@linux-m68k.org
Link: https://lkml.kernel.org/r/20210706100945.3803694-2-geert@linux-m68k.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Trent Piepho <tpiepho@gmail.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/llvm: update IRC location

This should have been done with commit 91ed3ed0f798 ("MAINTAINERS: update
ClangBuiltLinux IRC chat") but I did not realize it was in two separate
spots.

Link: https://lkml.kernel.org/r/20210825211823.6406-3-nathan@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/llvm: update mailing list

We are now at llvm@lists.linux.dev.

Link: https://lkml.kernel.org/r/20210825211823.6406-2-nathan@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS: update ClangBuiltLinux mailing list

We are now at llvm@lists.linux.dev.

Link: https://lkml.kernel.org/r/20210825211823.6406-1-nathan@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

profiling: fix shift-out-of-bounds bugs

Syzbot reported shift-out-of-bounds bug in profile_init().
The problem was in incorrect prof_shift. Since prof_shift value comes from
userspace we need to clamp this value into [0, BITS_PER_LONG -1]
boundaries.

Second possible shiht-out-of-bounds was found by Tetsuo:
sample_step local variable in read_profile() had "unsigned int" type,
but prof_shift allows to make a BITS_PER_LONG shift. So, to prevent
possible shiht-out-of-bounds sample_step type was changed to
"unsigned long".

Also, "unsigned short int" will be sufficient for storing
[0, BITS_PER_LONG] value, that's why there is no need for
"unsigned long" prof_shift.

Link: https://lkml.kernel.org/r/20210813140022.5011-1-paskripkin@gmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-and-tested-by: syzbot+e68c89a9510c159d9684@syzkaller.appspotmail.com
Suggested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/acct.c: use dedicated helper to access rlimit values

Use rlimit() helper instead of manually writing whole chain from
task to rlimit value. See patch "posix-cpu-timers: Use dedicated
helper to access rlimit values".

Link: https://lkml.kernel.org/r/20210728030822.524789-1-yang.yang29@zte.com.cn
Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Reported-by: Zeal Robot <zealci@zte.com.cn>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: sh_def@163.com <sh_def@163.com>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

phy/drivers/stm32: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

Link: https://lkml.kernel.org/r/20210816114732.1834145-11-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Christian Eggers <ceggers@arri.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mtd/drivers/nand: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

Link: https://lkml.kernel.org/r/20210816114732.1834145-10-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Christian Eggers <ceggers@arri.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

i2c/drivers/ov02q10: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

Link: https://lkml.kernel.org/r/20210816114732.1834145-9-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Christian Eggers <ceggers@arri.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

iio/drivers/hid-sensor: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

Link: https://lkml.kernel.org/r/20210816114732.1834145-8-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Christian Eggers <ceggers@arri.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

hwmon/drivers/mr75203: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

The new macro is an unsigned long.  The code dealing with it is
considering as an unsigned long also.

Link: https://lkml.kernel.org/r/20210816114732.1834145-7-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Christian Eggers <ceggers@arri.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

iio/drivers/as73211: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

Link: https://lkml.kernel.org/r/20210816114732.1834145-6-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Christian Eggers <ceggers@arri.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

devfreq: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

The new macro has an unsigned long type.

All the code is dealing with unsigned long and the code using the macro is
doing a coercitive cast to unsigned long.

Link: https://lkml.kernel.org/r/20210816114732.1834145-5-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Christian Eggers <ceggers@arri.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

thermal/drivers/devfreq_cooling: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

The new macro uses a unsigned long type which is already the type in the
current code via the 'freq' variable.

Link: https://lkml.kernel.org/r/20210816114732.1834145-4-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Christian Eggers <ceggers@arri.de>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

units: add the HZ macros

The macros for the unit conversion for frequency are duplicated in
different places.

Provide these macros in the 'units' header, so they can be reused.

Link: https://lkml.kernel.org/r/20210816114732.1834145-3-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Christian Eggers <ceggers@arri.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

units: change from 'L' to 'UL'

Patch series "Add Hz macros", v3.

There are multiple definitions of the HZ_PER_MHZ or HZ_PER_KHZ in the
different drivers.  Instead of duplicating this definition again and
again, add one in the units.h header to be reused in all the place the
redefiniton occurs.

At the same time, change the type of the Watts, as they can not be
negative.

This patch (of 10):

The users of the macros are safe to be assigned with an unsigned instead
of signed as the variables using them are themselves unsigned.

Link: https://lkml.kernel.org/r/20210816114732.1834145-1-daniel.lezcano@linaro.org
Link: https://lkml.kernel.org/r/20210816114732.1834145-2-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Christian Eggers <ceggers@arri.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/once.h: fix trivia typo Not -> Note

Fix trivia typo Not -> Note in the comment to DO_ONCE().

Link: https://lkml.kernel.org/r/20210722184349.76290-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch: Kconfig: fix spelling mistake "seperate" -> "separate"

Threre is a spelling mistake in the Kconfig text. Fix it.

Link: https://lkml.kernel.org/r/20210704095207.37342-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>