Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Unfortunately reparse attribute is used for many purposes (several dozens).
It is not possible here to know is this name symlink or not.
To get exactly the type of name we should to open inode (read mft).
getattr for opened file (fstat) correctly returns symlink.
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Pull smb client fixes from Steve French:

 - Two fallocate fixes

 - Fix warnings from new gcc

 - Two symlink fixes

* tag 'v6.7-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb: client, common: fix fortify warnings
  cifs: Fix FALLOC_FL_INSERT_RANGE by setting i_size after EOF moved
  cifs: Fix FALLOC_FL_ZERO_RANGE by setting i_size if EOF moved
  smb: client: report correct st_size for SMB and NFS symlinks
  smb: client: fix missing mode bits for SMB symlinks

Merge tag 'firewire-fixes-6.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

Pull firewire fix from Takashi Sakamoto:
 "A single patch to fix long-standing issue of memory leak at failure of
  device registration for fw_unit. We rarely encounter the issue, but it
  should be applied to stable releases, since it fixes inappropriate API
  usage"

* tag 'firewire-fixes-6.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
  firewire: core: fix possible memory leak in create_units()

Pull powerpc fixes from Michael Ellerman:

 - Fix corruption of f0/vs0 during FP/Vector save, seen as userspace
   crashes when using io-uring workers (in particular with MariaDB)

 - Fix KVM_RUN potentially clobbering all host userspace FP/Vector
   registers

Thanks to Timothy Pearson, Jens Axboe, and Nicholas Piggin.

* tag 'powerpc-6.7-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  KVM: PPC: Book3S HV: Fix KVM_RUN clobbering FP/VEC user registers
  powerpc: Don't clobber f0/vs0 during fp|altivec register save

Pull vfio fixes from Alex Williamson:

 - Fix the lifecycle of a mutex in the pds variant driver such that a
   reset prior to opening the device won't find it uninitialized.
   Implement the release path to symmetrically destroy the mutex. Also
   switch a different lock from spinlock to mutex as the code path has
   the potential to sleep and doesn't need the spinlock context
   otherwise (Brett Creeley)

 - Fix an issue detected via randconfig where KVM tries to symbol_get an
   undeclared function. The symbol is temporarily declared
   unconditionally here, which resolves the problem and avoids churn
   relative to a series pending for the next merge window which resolves
   some of this symbol ugliness, but also fixes Kconfig dependencies
   (Sean Christopherson)

* tag 'vfio-v6.7-rc4' of https://github.com/awilliam/linux-vfio:
  vfio: Drop vfio_file_iommu_group() stub to fudge around a KVM wart
  vfio/pds: Fix possible sleep while in atomic context
  vfio/pds: Fix mutex lock->magic != lock warning

Pull xen fixes from Juergen Gross:

 - A fix for the Xen event driver setting the correct return value when
   experiencing an allocation failure

 - A fix for allocating space for a struct in the percpu area to not
   cross page boundaries (this one is for x86, a similar one for Arm was
   already in the pull request for rc3)

* tag 'for-linus-6.7a-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/events: fix error code in xen_bind_pirq_msi_to_irq()
  x86/xen: fix percpu vcpu_info allocation

Merge tag 'probes-fixes-v6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull probes fixes from Masami Hiramatsu:

 - objpool: Fix objpool overrun case on memory/cache access delay
   especially on the big.LITTLE SoC. The objpool uses a copy of object
   slot index internal loop, but the slot index can be changed on
   another processor in parallel. In that case, the difference of 'head'
   local copy and the 'slot->last' index will be bigger than local slot
   size. In that case, we need to re-read the slot::head to update it.

 - kretprobe: Fix to use appropriate rcu API for kretprobe holder. Since
   kretprobe_holder::rp is RCU managed, it should use
   rcu_assign_pointer() and rcu_dereference_check() correctly. Also
   adding __rcu tag for finding wrong usage by sparse.

 - rethook: Fix to use appropriate rcu API for rethook::handler. The
   same as kretprobe, rethook::handler is RCU managed and it should use
   rcu_assign_pointer() and rcu_dereference_check(). This also adds
   __rcu tag for finding wrong usage by sparse.

* tag 'probes-fixes-v6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  rethook: Use __rcu pointer for rethook::handler
  kprobes: consistent rcu api usage for kretprobe holder
  lib: objpool: fix head overrun on RK3588 SBC

Pull power management fixes from Rafael Wysocki:
 "These fix issues in two cpufreq drivers, in the AMD P-state driver and
  in the power-capping DTPM framework.

  Specifics:

   - Fix the AMD P-state driver's EPP sysfs interface in the cases when
     the performance governor is in use (Ayush Jain)

   - Make the ->fast_switch() callback in the AMD P-state driver return
     the target frequency as expected (Gautham R. Shenoy)

   - Allow user space to control the range of frequencies to use via
     scaling_min_freq and scaling_max_freq when AMD P-state driver is in
     use (Wyes Karny)

   - Prevent power domains needed for wakeup signaling from being turned
     off during system suspend on Qualcomm systems and prevent
     performance states votes from runtime-suspended devices from being
     lost across a system suspend-resume cycle in qcom-cpufreq-nvmem
     (Stephan Gerhold)

   - Fix disabling the 792 Mhz OPP in the imx6q cpufreq driver for the
     i.MX6ULL types that can run at that frequency (Christoph
     Niedermaier)

   - Eliminate unnecessary and harmful conversions to uW from the DTPM
     (dynamic thermal and power management) framework (Lukasz Luba)"

* tag 'pm-6.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq/amd-pstate: Only print supported EPP values for performance governor
  cpufreq/amd-pstate: Fix scaling_min_freq and scaling_max_freq update
  powercap: DTPM: Fix unneeded conversions to micro-Watts
  cpufreq/amd-pstate: Fix the return value of amd_pstate_fast_switch()
  pmdomain: qcom: rpmpd: Set GENPD_FLAG_ACTIVE_WAKEUP
  cpufreq: qcom-nvmem: Preserve PM domain votes in system suspend
  cpufreq: qcom-nvmem: Enable virtual power domain devices
  cpufreq: imx6q: Don't disable 792 Mhz OPP unnecessarily

Pull ACPI fixes from Rafael Wysocki:
 "This fixes a recently introduced build issue on ARM32 and a NULL
  pointer dereference in the ACPI backlight driver due to a design issue
  exposed by a recent change in the ACPI bus type code.

  Specifics:

   - Fix a recently introduced build issue on ARM32 platforms caused by
     an inadvertent header file breakage (Dave Jiang)

   - Eliminate questionable usage of acpi_driver_data() in the ACPI
     backlight cooling device code that leads to NULL pointer
     dereferences after recent ACPI core changes (Hans de Goede)"

* tag 'acpi-6.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: video: Use acpi_video_device for cooling-dev driver data
  ACPI: Fix ARM32 platforms compile issue introduced by fw_table changes

Pull arm64 fix from Catalin Marinas:
 "Fix a regression where the arm64 KPTI ends up enabled even on systems
  that don't need it"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Avoid enabling KPTI unnecessarily

Pull iommu fixes from Joerg Roedel:

 - Fix race conditions in device probe path

 - Handle ERR_PTR() returns in __iommu_domain_alloc() path

 - Update MAINTAINERS entry for Qualcom IOMMUs

 - Printk argument fix in device tree specific code

 - Several Intel VT-d fixes from Lu Baolu:
     - Do not support enforcing cache coherency for non-empty domains
     - Avoid devTLB invalidation if iommu is off
     - Disable PCI ATS in legacy passthrough mode
     - Support non-PCI devices when clearing context
     - Fix incorrect cache invalidation for mm notification
     - Add MTL to quirk list to skip TE disabling
     - Set variable intel_dirty_ops to static

* tag 'iommu-fixes-v6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu: Fix printk arg in of_iommu_get_resv_regions()
  iommu/vt-d: Set variable intel_dirty_ops to static
  iommu/vt-d: Fix incorrect cache invalidation for mm notification
  iommu/vt-d: Add MTL to quirk list to skip TE disabling
  iommu/vt-d: Make context clearing consistent with context mapping
  iommu/vt-d: Disable PCI ATS in legacy passthrough mode
  iommu/vt-d: Omit devTLB invalidation requests when TES=0
  iommu/vt-d: Support enforce_cache_coherency only for empty domains
  iommu: Avoid more races around device probe
  MAINTAINERS: list all Qualcomm IOMMU drivers in the QUALCOMM IOMMU entry
  iommu: Flow ERR_PTR out from __iommu_domain_alloc()

Pull sound fixes from Takashi Iwai:
 "No surprise here, including only a collection of HD-audio
  device-specific small fixes"

* tag 'sound-6.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda: Disable power-save on KONTRON SinglePC
  ALSA: hda/realtek: Add supported ALC257 for ChromeOS
  ALSA: hda/realtek: Headset Mic VREF to 100%
  ALSA: hda: intel-nhlt: Ignore vbps when looking for DMIC 32 bps format
  ALSA: hda: cs35l56: Enable low-power hibernation mode on SPI
  ALSA: cs35l41: Fix for old systems which do not support command
  ALSA: hda: cs35l41: Remove unnecessary boolean state variable firmware_running
  ALSA: hda - Fix speaker and headset mic pin config for CHUWI CoreBook XPro

Pull drm fixes from Dave Airlie:
 "Weekly fixes, mostly amdgpu fixes with a scattering of nouveau, i915,
  and a couple of reverts. Hopefully it will quieten down in coming
  weeks.

  drm:
   - Revert unexport of prime helpers for fd/handle conversion

  dma_resv:
   - Do not double add fences in dma_resv_add_fence.

  gpuvm:
   - Fix GPUVM license identifier.

  i915:
   - Mark internal GSC engine with reserved uabi class
   - Take VGA converters into account in eDP probe
   - Fix intel_pre_plane_updates() call to ensure workarounds get applied

  panel:
   - Revert panel fixes as they require exporting device_is_dependent.

  nouveau:
   - fix oversized allocations in new vm path
   - fix zero-length array
   - remove a stray lock

  nt36523:
   - Fix error check for nt36523.

  amdgpu:
   - DMUB fix
   - DCN 3.5 fixes
   - XGMI fix
   - DCN 3.2 fixes
   - Vangogh suspend fix
   - NBIO 7.9 fix
   - GFX11 golden register fix
   - Backlight fix
   - NBIO 7.11 fix
   - IB test overflow fix
   - DCN 3.1.4 fixes
   - fix a runtime pm ref count
   - Retimer fix
   - ABM fix
   - DCN 3.1.5 fix
   - Fix AGP addressing
   - Fix possible memory leak in SMU error path
   - Make sure PME is enabled in D3
   - Fix possible NULL pointer dereference in debugfs
   - EEPROM fix
   - GC 9.4.3 fix

  amdkfd:
   - IP version check fix
   - Fix memory leak in pqm_uninit()"

* tag 'drm-fixes-2023-12-01' of git://anongit.freedesktop.org/drm/drm: (53 commits)
  Revert "drm/prime: Unexport helpers for fd/handle conversion"
  drm/amdgpu: Use another offset for GC 9.4.3 remap
  drm/amd/display: Fix some HostVM parameters in DML
  drm/amdkfd: Free gang_ctx_bo and wptr_bo in pqm_uninit
  drm/amdgpu: Update EEPROM I2C address for smu v13_0_0
  drm/amd/display: Allow DTBCLK disable for DCN35
  drm/amdgpu: Fix cat debugfs amdgpu_regs_didt causes kernel null pointer
  drm/amd: Enable PCIe PME from D3
  drm/amd/pm: fix a memleak in aldebaran_tables_init
  drm/amdgpu: fix AGP addressing when GART is not at 0
  drm/amd/display: update dcn315 lpddr pstate latency
  drm/amd/display: fix ABM disablement
  drm/amd/display: Fix black screen on video playback with embedded panel
  drm/amd/display: Fix conversions between bytes and KB
  drm/amdkfd: Use common function for IP version check
  drm/amd/display: Remove config update
  drm/amd/display: Update DCN35 clock table policy
  drm/amd/display: force toggle rate wa for first link training for a retimer
  drm/amdgpu: correct the amdgpu runtime dereference usage count
  drm/amd/display: Update min Z8 residency time to 2100 for DCN314
  ...

Pull io_uring fixes from Jens Axboe:

 - Fix an issue with discontig page checking for IORING_SETUP_NO_MMAP

 - Fix an issue with not allowing IORING_SETUP_NO_MMAP also disallowing
   mmap'ed buffer rings

 - Fix an issue with deferred release of memory mapped pages

 - Fix a lockdep issue with IORING_SETUP_NO_MMAP

 - Use fget/fput consistently, even from our sync system calls. No real
   issue here, but if we were ever to allow closing io_uring descriptors
   it would be required. Let's play it safe and just use the full ref
   counted versions upfront. Most uses of io_uring are threaded anyway,
   and hence already doing the full version underneath.

* tag 'io_uring-6.7-2023-11-30' of git://git.kernel.dk/linux:
  io_uring: use fget/fput consistently
  io_uring: free io_buffer_list entries via RCU
  io_uring/kbuf: prune deferred locked cache when tearing down
  io_uring/kbuf: recycle freed mapped buffer ring entries
  io_uring/kbuf: defer release of mapped buffer rings
  io_uring: enable io_mem_alloc/free to be used in other parts
  io_uring: don't guard IORING_OFF_PBUF_RING with SETUP_NO_MMAP
  io_uring: don't allow discontig pages for IORING_SETUP_NO_MMAP

Pull block fixes from Jens Axboe:

 - NVMe pull request via Keith:
     - Invalid namespace identification error handling (Marizio Ewan,
       Keith)
     - Fabrics keep-alive tuning (Mark)

 - Fix for a bad error check regression in bcache (Markus)

 - Fix for a performance regression with O_DIRECT (Ming)

 - Fix for a flush related deadlock (Ming)

 - Make the read-only warn on per-partition (Yu)

* tag 'block-6.7-2023-12-01' of git://git.kernel.dk/linux:
  nvme-core: check for too small lba shift
  blk-mq: don't count completed flush data request as inflight in case of quiesce
  block: Document the role of the two attribute groups
  block: warn once for each partition in bio_check_ro()
  block: move .bd_inode into 1st cacheline of block_device
  nvme: check for valid nvme_identify_ns() before using it
  nvme-core: fix a memory leak in nvme_ns_info_from_identify()
  nvme: fine-tune sending of first keep-alive
  bcache: revert replacing IS_ERR_OR_NULL with IS_ERR

Merge tag 'dm-6.7/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix DM verity target's FEC support to always initialize IO before it
   frees it. Also fix alignment of struct dm_verity_fec_io within the
   per-bio-data

 - Fix DM verity target to not FEC failed readahead IO

 - Update DM flakey target to use MAX_ORDER rather than MAX_ORDER - 1

* tag 'dm-6.7/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-flakey: start allocating with MAX_ORDER
  dm-verity: align struct dm_verity_fec_io properly
  dm verity: don't perform FEC for failed readahead IO
  dm verity: initialize fec io before freeing it

Pull SCSI fixes from James Bottomley:
 "Three small fixes, one in drivers.

  The core changes are to the internal representation of flags in
  scsi_devices which removes space wasting bools in favour of single bit
  flags and to add a flag to force a runtime resume which is used by ATA
  devices"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: sd: Fix system start for ATA devices
  scsi: Change SCSI device boolean fields to single bit flags
  scsi: ufs: core: Clear cmd if abort succeeds in MCQ mode

Pull ext2 fix from Jan Kara:
 "Fix an ext2 bug introduced by changes in ext2 & iomap stepping on each
  other toes (apparently ext2 driver does not get much testing in
  linux-next)"

* tag 'fs_for_v6.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  ext2: Fix ki_pos update for DIO buffered-io fallback case

Pull more bcachefs bugfixes from Kent Overstreet:

 - bcache & bcachefs were broken with CFI enabled; patch for closures to
   fix type punning

 - mark erasure coding as extra-experimental; there are incompatible
   disk space accounting changes coming for erasure coding, and I'm
   still seeing checksum errors in some tests

 - several fixes for durability-related issues (durability is a device
   specific setting where we can tell bcachefs that data on a given
   device should be counted as replicated x times)

 - a fix for a rare livelock when a btree node merge then updates a
   parent node that is almost full

 - fix a race in the device removal path, where dropping a pointer in a
   btree node to a device would be clobbered by an in flight btree write
   updating the btree node key on completion

 - fix one SRCU lock hold time warning in the btree gc code - ther's
   still a bunch more of these to fix

 - fix a rare race where we'd start copygc before initializing the "are
   we rw" percpu refcount; copygc would think we were already ro and die
   immediately

* tag 'bcachefs-2023-11-29' of https://evilpiepirate.org/git/bcachefs: (23 commits)
  bcachefs: Extra kthread_should_stop() calls for copygc
  bcachefs: Convert gc_alloc_start() to for_each_btree_key2()
  bcachefs: Fix race between btree writes and metadata drop
  bcachefs: move journal seq assertion
  bcachefs: -EROFS doesn't count as move_extent_start_fail
  bcachefs: trace_move_extent_start_fail() now includes errcode
  bcachefs: Fix split_race livelock
  bcachefs: Fix bucket data type for stripe buckets
  bcachefs: Add missing validation for jset_entry_data_usage
  bcachefs: Fix zstd compress workspace size
  bcachefs: bpos is misaligned on big endian
  bcachefs: Fix ec + durability calculation
  bcachefs: Data update path won't accidentaly grow replicas
  bcachefs: deallocate_extra_replicas()
  bcachefs: Proper refcounting for journal_keys
  bcachefs: preserve device path as device name
  bcachefs: Fix an endianness conversion
  bcachefs: Start gc, copygc, rebalance threads after initing writes ref
  bcachefs: Don't stop copygc thread on device resize
  bcachefs: Make sure bch2_move_ratelimit() also waits for move_ops
  ...

Merge a fix for a recently introduced build issue on ARM32 platforms
caused by an inadvertent header file breakage (Dave Jiang).

* acpi-tables:
  ACPI: Fix ARM32 platforms compile issue introduced by fw_table changes

Merge a power capping fix for 6.7-rc4 which eliminates unnecessary
and harmful conversions to uW from the DTPM (dynamic thermal and power
management) framework (Lukasz Luba).

* powercap:
  powercap: DTPM: Fix unneeded conversions to micro-Watts

Pull NVMe fixes from Keith:

"nvme fixes for Linux 6.7

 - Invalid namespace identification error handling (Marizio Ewan, Keith)
 - Fabrics keep-alive tuning (Mark)"

* tag 'nvme-6.7-2023-12-01' of git://git.infradead.org/nvme:
  nvme-core: check for too small lba shift
  nvme: check for valid nvme_identify_ns() before using it
  nvme-core: fix a memory leak in nvme_ns_info_from_identify()
  nvme: fine-tune sending of first keep-alive

The block layer doesn't support logical block sizes smaller than 512
bytes. The nvme spec doesn't support that small either, but the driver
isn't checking to make sure the device responded with usable data.
Failing to catch this will result in a kernel bug, either from a
division by zero when stacking, or a zero length bio.
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Keith Busch <kbusch@kernel.org>

Request queue quiesce may interrupt flush sequence, and the original request
may have been marked as COMPLETE, but can't get finished because of
queue quiesce.

This way is fine from driver viewpoint, because flush sequence is block
layer concept, and it isn't related with driver.

However, driver(such as dm-rq) can call blk_mq_queue_inflight() to count &
drain inflight requests, then the wait & drain never gets done because
the completed & not-finished flush request is counted as inflight.

Fix this issue by not counting completed flush data request as inflight in
case of quiesce.

Cc: Mike Snitzer <snitzer@kernel.org>
Cc: David Jeffery <djeffery@redhat.com>
Cc: John Pittman <jpittman@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20231201085605.577730-1-ming.lei@redhat.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

The variable phys is defined as (struct resource *) which aligns with
the printk format specifier %pr. Taking the address of it results in a
value of type (struct resource **) which is incompatible with the format
specifier %pr. Therefore, remove the address of operator (&).

Fixes: a5bf3cfc ("iommu: Implement of_iommu_get_resv_regions()")
Signed-off-by: Daniel Mentz <danielmentz@google.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20231108062226.928985-1-danielmentz@google.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

Since the rethook::handler is an RCU-maganged pointer so that it will
notice readers the rethook is stopped (unregistered) or not, it should
be an __rcu pointer and use appropriate functions to be accessed. This
will use appropriate memory barrier when accessing it. OTOH,
rethook::data is never changed, so we don't need to check it in
get_kretprobe().

NOTE: To avoid sparse warning, rethook::handler is defined by a raw
function pointer type with __rcu instead of rethook_handler_t.

Link: https://lore.kernel.org/all/170126066201.398836.837498688669005979.stgit@devnote2/

Fixes: 54ecbe6f ("rethook: Add a generic return hook")
Cc: stable@vger.kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311241808.rv9ceuAh-lkp@intel.com/Tested-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

It seems that the pointer-to-kretprobe "rp" within the kretprobe_holder is
RCU-managed, based on the (non-rethook) implementation of get_kretprobe().
The thought behind this patch is to make use of the RCU API where possible
when accessing this pointer so that the needed barriers are always in place
and to self-document the code.

The __rcu annotation to "rp" allows for sparse RCU checking. Plain writes
done to the "rp" pointer are changed to make use of the RCU macro for
assignment. For the single read, the implementation of get_kretprobe()
is simplified by making use of an RCU macro which accomplishes the same,
but note that the log warning text will be more generic.

I did find that there is a difference in assembly generated between the
usage of the RCU macros vs without. For example, on arm64, when using
rcu_assign_pointer(), the corresponding store instruction is a
store-release (STLR) which has an implicit barrier. When normal assignment
is done, a regular store (STR) is found. In the macro case, this seems to
be a result of rcu_assign_pointer() using smp_store_release() when the
value to write is not NULL.

Link: https://lore.kernel.org/all/20231122132058.3359-1-inwardvessel@gmail.com/

Fixes: d741bf41 ("kprobes: Remove kretprobe hash")
Cc: stable@vger.kernel.org
Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>