The current state of the art for sparse register maps is the
rbtree cache.  This works well for most applications but isn't
always ideal for sparser register maps since the rbtree can get
deep, requiring a lot of walking.  Fortunately the kernel has a
data structure intended to address this very problem, the maple
tree.  Provide an initial implementation of a register cache
based on the maple tree to start taking advantage of it.

The entries stored in the maple tree are arrays of register
values, with the maple tree keys holding the register addresses.
We store data in host native format rather than device native
format as we do for rbtree, this will be a benefit for devices
where we don't marshal data within regmap and simplifies the code
but will result in additional CPU overhead when syncing the cache
on devices where we do marshal data in regmap.

This should work well for a lot of devices, though there's some
additional areas that could be looked at such as caching the
last accessed entry like we do for rbtree and trying to minimise
the maple tree level locking. We should also use bulk writes
rather than single register writes when resyncing the cache where
possible, even if we don't store in device native format.

Very small register maps may continue to to better with rbtree
longer term.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230325-regcache-maple-v3-2-23e271f93dc7@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

In order to support sparse caches that don't store data in raw format
factor out the parts of the raw block sync implementation that deal with
writing a single register via _regmap_write().
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230325-regcache-maple-v3-1-23e271f93dc7@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

On the theory that it's better to make a start let's add some KUnit tests
for regmap. Currently this is a bit of a mess but it passes and hopefully
will at some point help catch problems. We provide very basic cover for
most of the core functionality that operates at the register level,
repeating each test for each cache type in order to exercise the caches.
There is no coverage of anything to do with the bulk operations at the bus
level or formatting for byte stream buses yet.

Each test creates it's own regmap since the cache structures are built
incrementally, meaning we gain coverage from the different access
patterns, and some of the tests cover different init scenarios.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regmap-kunit-v2-2-b208801dc2c8@kernel.org

Add a register map that is a simple array of memory, for use in
KUnit testing of the framework. This is not exposed in regmap.h
since I can't think of a non-test use case, it is purely for use
internally. To facilitate testing we track if registers have been
read or written to.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regmap-kunit-v2-1-b208801dc2c8@kernel.org

The compressed register cache support has assumptions that make it hard to
cover in testing, mainly that it requires raw registers defaults be
provided. Rather than either address these assumptions or leave it untested
by the forthcoming KUnit tests let's remove it, the use case is quite thin
and there are no current users.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regcache-lzo-v1-1-08c5d63e2a5e@kernel.org

We don't currently support paging for regmaps where the I/O happens through
bus provided reg_read() and reg_write() operatons, we simply ignore the
range since nothing is wired up properly. Wire things up.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regmap-reg-read-write-page-v1-1-1fbc0dac67ae@kernel.org

The error message printed when we fail to locate the cache type the map
requested says it can't find a compress type rather than a cache type,
fix that. Since the compressed type is the only one currently compiled
conditionally it's likely to be the missing type but that might not always
be true and is still unclear.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230324-regcache-unknown-v1-1-80deecbf196b@kernel.org

If there is no cache entry available we will get -ENOENT from the cache
implementation, handle this gracefully and skip rather than treating it as
an error.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230325-regcache-sparse-sync-v1-1-2a890239d061@kernel.org

Merge series from Maxime Chevallier <maxime.chevallier@bootlin.com>:

This introduces a helper that factors out register rewriting, it
will be the basis for further work that will need cross tree
merges so is on a branch.

Register addresses passed to regmap operations can be offset with
regmap.reg_base and downshifted with regmap.reg_downshift.

Add a helper to apply both these operations and return the translated
address, that we can then use to perform the actual register operation
ont the underlying bus.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://lore.kernel.org/r/20230324093644.464704-2-maxime.chevallier@bootlin.comSigned-off-by: Mark Brown <broonie@kernel.org>

Pull tracing fixes from Steven Rostedt:

 - Fix setting affinity of hwlat threads in containers

   Using sched_set_affinity() has unwanted side effects when being
   called within a container. Use set_cpus_allowed_ptr() instead

 - Fix per cpu thread management of the hwlat tracer:
    - Do not start per_cpu threads if one is already running for the CPU
    - When starting per_cpu threads, do not clear the kthread variable
      as it may already be set to running per cpu threads

 - Fix return value for test_gen_kprobe_cmd()

   On error the return value was overwritten by being set to the result
   of the call from kprobe_event_delete(), which would likely succeed,
   and thus have the function return success

 - Fix splice() reads from the trace file that was broken by commit
   36e2c742 ("fs: don't allow splice read/write without explicit
   ops")

 - Remove obsolete and confusing comment in ring_buffer.c

   The original design of the ring buffer used struct page flags for
   tricks to optimize, which was shortly removed due to them being
   tricks. But a comment for those tricks remained

 - Set local functions and variables to static

* tag 'trace-v6.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing/hwlat: Replace sched_setaffinity with set_cpus_allowed_ptr
  ring-buffer: remove obsolete comment for free_buffer_page()
  tracing: Make splice_read available again
  ftrace: Set direct_ops storage-class-specifier to static
  trace/hwlat: Do not start per-cpu thread if it is already running
  trace/hwlat: Do not wipe the contents of per-cpu thread data
  tracing/osnoise: set several trace_osnoise.c variables storage-class-specifier to static
  tracing: Fix wrong return in kprobe_event_gen_test.c

There is a problem with the behavior of hwlat in a container,
resulting in incorrect output. A warning message is generated:
"cpumask changed while in round-robin mode, switching to mode none",
and the tracing_cpumask is ignored. This issue arises because
the kernel thread, hwlatd, is not a part of the container, and
the function sched_setaffinity is unable to locate it using its PID.
Additionally, the task_struct of hwlatd is already known.
Ultimately, the function set_cpus_allowed_ptr achieves
the same outcome as sched_setaffinity, but employs task_struct
instead of PID.

Test case:

  # cd /sys/kernel/tracing
  # echo 0 > tracing_on
  # echo round-robin > hwlat_detector/mode
  # echo hwlat > current_tracer
  # unshare --fork --pid bash -c 'echo 1 > tracing_on'
  # dmesg -c

Actual behavior:

[573502.809060] hwlat_detector: cpumask changed while in round-robin mode, switching to mode none

Link: https://lore.kernel.org/linux-trace-kernel/20230316144535.1004952-1-costa.shul@redhat.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: 0330f7aa ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

The comment refers to mm/slob.c which is being removed. It comes from
commit ed56829c ("ring_buffer: reset buffer page when freeing") and
according to Steven the borrowed code was a page mapcount and mapping
reset, which was later removed by commit e4c2ce82 ("ring_buffer:
allocate buffer page pointer"). Thus the comment is not accurate anyway,
remove it.

Link: https://lore.kernel.org/linux-trace-kernel/20230315142446.27040-1-vbabka@suse.cz

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Reported-by: Mike Rapoport <mike.rapoport@gmail.com>
Suggested-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Fixes: e4c2ce82 ("ring_buffer: allocate buffer page pointer")
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Since the commit 36e2c742 ("fs: don't allow splice read/write
without explicit ops") is applied to the kernel, splice() and
sendfile() calls on the trace file (/sys/kernel/debug/tracing
/trace) return EINVAL.

This patch restores these system calls by initializing splice_read
in file_operations of the trace file. This patch only enables such
functionalities for the read case.

Link: https://lore.kernel.org/linux-trace-kernel/20230314013707.28814-1-sfoon.kim@samsung.com

Cc: stable@vger.kernel.org
Fixes: 36e2c742 ("fs: don't allow splice read/write without explicit ops")
Signed-off-by: Sung-hun Kim <sfoon.kim@samsung.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Pull tty/serial driver fixes from Greg KH:
 "Here are some small tty and serial driver fixes for 6.3-rc3 to resolve
  some reported issues.

  They include:

   - 8250 driver Kconfig issue pointed out by you that showed up in -rc1

   - qcom-geni serial driver fixes

   - various 8250 driver fixes for reported problems

   - fsl_lpuart driver fixes

   - serdev fix for regression in -rc1

   - vt.c bugfix

  All have been in linux-next for over a week with no reported problems"

* tag 'tty-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: vt: protect KD_FONT_OP_GET_TALL from unbound access
  serial: qcom-geni: drop bogus uart_write_wakeup()
  serial: qcom-geni: fix mapping of empty DMA buffer
  serial: qcom-geni: fix DMA mapping leak on shutdown
  serial: qcom-geni: fix console shutdown hang
  serdev: Set fwnode for serdev devices
  tty: serial: fsl_lpuart: fix race on RX DMA shutdown
  serial: 8250_pci1xxxx: Disable SERIAL_8250_PCI1XXXX config by default
  serial: 8250_fsl: fix handle_irq locking
  serial: 8250_em: Fix UART port type
  serial: 8250: ASPEED_VUART: select REGMAP instead of depending on it
  tty: serial: fsl_lpuart: skip waiting for transmission complete when UARTCTRL_SBK is asserted
  Revert "tty: serial: fsl_lpuart: adjust SERIAL_FSL_LPUART_CONSOLE config dependency"

Pull char/misc driver fixes from Greg KH:
 "Here are a few small char/misc/other driver subsystem patches to
  resolve reported problems for 6.3-rc3.

  Included in here are:

   - Interconnect driver fixes for reported problems

   - Memory driver fixes for reported problems

   - nvmem core fix

   - firmware driver fix for reported problem

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

* tag 'char-misc-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (23 commits)
  memory: tegra30-emc: fix interconnect registration race
  memory: tegra20-emc: fix interconnect registration race
  memory: tegra124-emc: fix interconnect registration race
  memory: tegra: fix interconnect registration race
  interconnect: exynos: drop redundant link destroy
  interconnect: exynos: fix registration race
  interconnect: exynos: fix node leak in probe PM QoS error path
  interconnect: qcom: msm8974: fix registration race
  interconnect: qcom: rpmh: fix registration race
  interconnect: qcom: rpmh: fix probe child-node error handling
  interconnect: qcom: rpm: fix registration race
  nvmem: core: return -ENOENT if nvmem cell is not found
  firmware: xilinx: don't make a sleepable memory allocation from an atomic context
  interconnect: qcom: rpm: fix probe child-node error handling
  interconnect: qcom: osm-l3: fix registration race
  interconnect: imx: fix registration race
  interconnect: fix provider registration API
  interconnect: fix icc_provider_del() error handling
  interconnect: fix mem leak when freeing nodes
  interconnect: qcom: qcm2290: Fix MASTER_SNOC_BIMC_NRT
  ...

Pull RAS fix from Borislav Petkov:

 - Flush out logged errors immediately after MCA banks configuration
   changes over sysfs have been done instead of waiting until something
   else triggers the workqueue later - another error or the polling
   interval cycle is reached

* tag 'ras_urgent_for_v6.3_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce: Make sure logged MCEs are processed after sysfs update

Pull perf fixes from Borislav Petkov:

 - Check whether sibling events have been deactivated before adding them
   to groups

 - Update the proper event time tracking variable depending on the event
   type

 - Fix a memory overwrite issue due to using the wrong function argument
   when outputting perf events

* tag 'perf_urgent_for_v6.3_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix check before add_event_to_groups() in perf_group_detach()
  perf: fix perf_event_context->time
  perf/core: Fix perf_output_begin parameter is incorrectly invoked in perf_event_bpf_output

Pull x86 fixes from Borislav Petkov:
 "There's a little bit more 'movement' in there for my taste but it
  needs to happen and should make the code better after it.

   - Check cmdline_find_option()'s return value before further
     processing

   - Clear temporary storage in the resctrl code to prevent access to an
     unexistent MSR

   - Add a simple throttling mechanism to protect the hypervisor from
     potentially malicious SEV guests issuing requests in rapid
     succession.

     In order to not jeopardize the sanity of everyone involved in
     maintaining this code, the request issuing side has received a
     cleanup, split in more or less trivial, small and digestible
     pieces. Otherwise, the code was threatening to become an
     unmaintainable mess.

     Therefore, that cleanup is marked indirectly also for stable so
     that there's no differences between the upstream code and the
     stable variant when it comes down to backporting more there"

* tag 'x86_urgent_for_v6.3_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Fix use of uninitialized buffer in sme_enable()
  x86/resctrl: Clear staged_config[] before and after it is used
  virt/coco/sev-guest: Add throttling awareness
  virt/coco/sev-guest: Convert the sw_exit_info_2 checking to a switch-case
  virt/coco/sev-guest: Do some code style cleanups
  virt/coco/sev-guest: Carve out the request issuing logic into a helper
  virt/coco/sev-guest: Remove the disable_vmpck label in handle_guest_request()
  virt/coco/sev-guest: Simplify extended guest request handling
  virt/coco/sev-guest: Check SEV_SNP attribute at probe time

Pull ext4 fix from Ted Ts'o:
 "Fix a double unlock bug on an error path in ext4, found by smatch and
  syzkaller"

* tag 'ext4_for_linus_urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix possible double unlock when moving a directory

smatch reports this warning
kernel/trace/ftrace.c:2594:19: warning:
  symbol 'direct_ops' was not declared. Should it be static?

The variable direct_ops is only used in ftrace.c, so it should be static

Link: https://lore.kernel.org/linux-trace-kernel/20230311135113.711824-1-trix@redhat.comSigned-off-by: Tom Rix <trix@redhat.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

The hwlatd tracer will end up starting multiple per-cpu threads with
the following script:

    #!/bin/sh
    cd /sys/kernel/debug/tracing
    echo 0 > tracing_on
    echo hwlat > current_tracer
    echo per-cpu > hwlat_detector/mode
    echo 100000 > hwlat_detector/width
    echo 200000 > hwlat_detector/window
    echo 1 > tracing_on

To fix the issue, check if the hwlatd thread for the cpu is already
running, before starting a new one. Along with the previous patch, this
avoids running multiple instances of the same CPU thread on the system.

Link: https://lore.kernel.org/all/20230302113654.2984709-1-tero.kristo@linux.intel.com/
Link: https://lkml.kernel.org/r/20230310100451.3948583-3-tero.kristo@linux.intel.com

Cc: stable@vger.kernel.org
Fixes: f46b1652 ("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Do not wipe the contents of the per-cpu kthread data when starting the
tracer, as this will completely forget about already running instances
and can later start new additional per-cpu threads.

Link: https://lore.kernel.org/all/20230302113654.2984709-1-tero.kristo@linux.intel.com/
Link: https://lkml.kernel.org/r/20230310100451.3948583-2-tero.kristo@linux.intel.com

Cc: stable@vger.kernel.org
Fixes: f46b1652 ("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

smatch reports several similar warnings
kernel/trace/trace_osnoise.c:220:1: warning:
  symbol '__pcpu_scope_per_cpu_osnoise_var' was not declared. Should it be static?
kernel/trace/trace_osnoise.c:243:1: warning:
  symbol '__pcpu_scope_per_cpu_timerlat_var' was not declared. Should it be static?
kernel/trace/trace_osnoise.c:335:14: warning:
  symbol 'interface_lock' was not declared. Should it be static?
kernel/trace/trace_osnoise.c:2242:5: warning:
  symbol 'timerlat_min_period' was not declared. Should it be static?
kernel/trace/trace_osnoise.c:2243:5: warning:
  symbol 'timerlat_max_period' was not declared. Should it be static?

These variables are only used in trace_osnoise.c, so it should be static

Link: https://lore.kernel.org/linux-trace-kernel/20230309150414.4036764-1-trix@redhat.comSigned-off-by: Tom Rix <trix@redhat.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Overwriting the error code with the deletion result may cause the
function to return 0 despite encountering an error. Commit b111545d
("tracing: Remove the useless value assignment in
test_create_synth_event()") solves a similar issue by
returning the original error code, so this patch does the same.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Link: https://lore.kernel.org/linux-trace-kernel/20230131075818.5322-1-aagusev@ispras.ruSigned-off-by: Anton Gusev <aagusev@ispras.ru>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Pull fbdev fixes from Helge Deller:
 "The majority of lines changed is due to a code style cleanup in the
  pnmtologo helper program.

  Arnd removed the omap1 osk driver and the SIS fb driver is now
  orphaned.

  Other than that it's the usual bunch of small fixes and cleanups, e.g.
  prevent possible divide-by-zero in various fb drivers if the pixclock
  is zero and various conversions to devm_platform*() and of_property*()
  functions:

   - Drop omap1 osk driver

   - Various potential divide by zero pixclock fixes

   - Add pixelclock and fb_check_var() to stifb

   - Code style cleanups and indenting fixes"

* tag 'fbdev-for-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev:
  fbdev: Use of_property_present() for testing DT property presence
  fbdev: au1200fb: Fix potential divide by zero
  fbdev: lxfb: Fix potential divide by zero
  fbdev: intelfb: Fix potential divide by zero
  fbdev: nvidia: Fix potential divide by zero
  fbdev: stifb: Provide valid pixelclock and add fb_check_var() checks
  fbdev: omapfb: remove omap1 osk driver
  fbdev: xilinxfb: Use devm_platform_get_and_ioremap_resource()
  fbdev: wm8505fb: Use devm_platform_ioremap_resource()
  fbdev: pxa3xx-gcu: Use devm_platform_get_and_ioremap_resource()
  fbdev: Use of_property_read_bool() for boolean properties
  fbdev: clps711x-fb: Use devm_platform_get_and_ioremap_resource()
  fbdev: tgafb: Fix potential divide by zero
  MAINTAINERS: orphan SIS FRAMEBUFFER DRIVER
  fbdev: omapfb: cleanup inconsistent indentation
  drivers: video: logo: add SPDX comment, remove GPL notice in pnmtologo.c
  drivers: video: logo: fix code style issues in pnmtologo.c

Merge tag 'kbuild-fixes-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Exclude kallsyms_seqs_of_names from kallsyms to fix build error

 - Fix 'make kernelrelease' for external module builds

 - Get the Debian source package compilable again

 - Fix the wrong uname when Debian packages are built with the
   KDEB_PKGVERSION option

 - Fix superfluous CROSS_COMPILE when building Debian packages

 - Fix RPM package build error when KCONFIG_CONFIG is set

 - Use 'git archive' for creating source tarballs

 - Remove the scripts/list-gitignored tool

* tag 'kbuild-fixes-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: use git-archive for source package creation
  kbuild: rpm-pkg: move source components to rpmbuild/SOURCES
  kbuild: deb-pkg: use dh_listpackages to know enabled packages
  kbuild: deb-pkg: split image and debug objects staging out into functions
  kbuild: deb-pkg: set CROSS_COMPILE only when undefined
  kbuild: deb-pkg: do not take KERNELRELEASE from the source version
  kbuild: deb-pkg: make debian source package working again
  Makefile: Make kernelrelease target work with M=
  kconfig: Update config changed flag before calling callback
  kallsyms: add kallsyms_seqs_of_names to list of special symbols

Merge tag 'hwmon-for-v6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - ltc2992, adm1266: Set missing can_sleep flag

 - tmp512/tmp513: Drop of_match_ptr for ID table to fix build with
   !CONFIG_OF

 - ucd90320: Fix back-to-back access problem

 - ina3221: Fix bad error return from probe function

 - xgene: Fix use-after-free bug in remove function

 - adt7475: Fix hysteresis register bit masks, and fix association of
   'smoothing' attributes

* tag 'hwmon-for-v6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (ltc2992) Set `can_sleep` flag for GPIO chip
  hwmon: (adm1266) Set `can_sleep` flag for GPIO chip
  hwmon: tmp512: drop of_match_ptr for ID table
  hwmon: (ucd90320) Add minimum delay between bus accesses
  hwmon: (ina3221) return prober error code
  hwmon: (xgene) Fix use after free bug in xgene_hwmon_remove due to race condition
  hwmon: (adt7475) Fix masking of hysteresis registers
  hwmon: (adt7475) Display smoothing attributes in correct order

Pull ata fixes from Damien Le Moal:

 - Two fixes from Ondrej for the pata_parport driver to address an issue
   with error handling during drive connection and to fix memory leaks
   in case of errors during initialization and when disconnecting a
   device.

* tag 'ata-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
  ata: pata_parport: fix memory leaks
  ata: pata_parport: fix parport release without claim

The __find_restype() function loops over the m5mols_default_ffmt[]
array, and the termination condition ends up being wrong: instead of
stopping when the iterator becomes the size of the array it traverses,
it stops after it has already overshot the array.

Now, in practice this doesn't likely matter, because the code will
always find the entry it looks for, and will thus return early and never
hit that last extra iteration.

But it turns out that clang will unroll the loop fully, because it has
only two iterations (well, three due to the off-by-one bug), and then
clang will end up just giving up in the middle of the loop unrolling
when it notices that the code walks past the end of the array.

And that made 'objtool' very unhappy indeed, because the generated code
just falls off the edge of the universe, and ends up falling through to
the next function, causing this warning:

   drivers/media/i2c/m5mols/m5mols.o: warning: objtool: m5mols_set_fmt() falls through to next function m5mols_get_frame_desc()

Fix the loop ending condition.
Reported-by: Jens Axboe <axboe@kernel.dk>
Analyzed-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Analyzed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/linux-block/CAHk-=wgTSdKYbmB1JYM5vmHMcD9J9UZr0mn7BOYM_LudrP+Xvw@mail.gmail.com/
Fixes: bc125106 ("[media] Add support for M-5MOLS 8 Mega Pixel camera ISP")
Cc: HeungJun, Kim <riverful.kim@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Fixes: 0813299c ("ext4: Fix possible corruption when moving a directory")
Link: https://lore.kernel.org/r/5efbe1b9-ad8b-4a4f-b422-24824d2b775c@kili.mountainReported-by: Dan Carpenter <error27@gmail.com>
Reported-by: syzbot+0c73d1d8b952c5f3d714@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Pull networking fixes from Jakub Kicinski:
 "Including fixes from netfilter, wifi and ipsec.

  A little more changes than usual, but it's pretty normal for us that
  the rc3/rc4 PRs are oversized as people start testing in earnest.

  Possibly an extra boost from people deploying the 6.1 LTS but that's
  more of an unscientific hunch.

  Current release - regressions:

   - phy: mscc: fix deadlock in phy_ethtool_{get,set}_wol()

   - virtio: vsock: don't use skbuff state to account credit

   - virtio: vsock: don't drop skbuff on copy failure

   - virtio_net: fix page_to_skb() miscalculating the memory size

  Current release - new code bugs:

   - eth: correct xdp_features after device reconfig

   - wifi: nl80211: fix the puncturing bitmap policy

   - net/mlx5e: flower:
      - fix raw counter initialization
      - fix missing error code
      - fix cloned flow attribute

   - ipa:
      - fix some register validity checks
      - fix a surprising number of bad offsets
      - kill FILT_ROUT_CACHE_CFG IPA register

  Previous releases - regressions:

   - tcp: fix bind() conflict check for dual-stack wildcard address

   - veth: fix use after free in XDP_REDIRECT when skb headroom is small

   - ipv4: fix incorrect table ID in IOCTL path

   - ipvlan: make skb->skb_iif track skb->dev for l3s mode

   - mptcp:
      - fix possible deadlock in subflow_error_report
      - fix UaFs when destroying unaccepted and listening sockets

   - dsa: mv88e6xxx: fix max_mtu of 1492 on 6165, 6191, 6220, 6250, 6290

  Previous releases - always broken:

   - tcp: tcp_make_synack() can be called from process context, don't
     assume preemption is disabled when updating stats

   - netfilter: correct length for loading protocol registers

   - virtio_net: add checking sq is full inside xdp xmit

   - bonding: restore IFF_MASTER/SLAVE flags on bond enslave Ethertype
     change

   - phy: nxp-c45-tja11xx: fix MII_BASIC_CONFIG_REV bit number

   - eth: i40e: fix crash during reboot when adapter is in recovery mode

   - eth: ice: avoid deadlock on rtnl lock when auxiliary device
     plug/unplug meets bonding

   - dsa: mt7530:
      - remove now incorrect comment regarding port 5
      - set PLL frequency and trgmii only when trgmii is used

   - eth: mtk_eth_soc: reset PCS state when changing interface types

  Misc:

   - ynl: another license adjustment

   - move the TCA_EXT_WARN_MSG attribute for tc action"

* tag 'net-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (108 commits)
  selftests: bonding: add tests for ether type changes
  bonding: restore bond's IFF_SLAVE flag if a non-eth dev enslave fails
  bonding: restore IFF_MASTER/SLAVE flags on bond enslave ether type change
  net: renesas: rswitch: Fix GWTSDIE register handling
  net: renesas: rswitch: Fix the output value of quote from rswitch_rx()
  ethernet: sun: add check for the mdesc_grab()
  net: ipa: fix some register validity checks
  net: ipa: kill FILT_ROUT_CACHE_CFG IPA register
  net: ipa: add two missing declarations
  net: ipa: reg: include <linux/bug.h>
  net: xdp: don't call notifiers during driver init
  net/sched: act_api: add specific EXT_WARN_MSG for tc action
  Revert "net/sched: act_api: move TCA_EXT_WARN_MSG to the correct hierarchy"
  net: dsa: microchip: fix RGMII delay configuration on KSZ8765/KSZ8794/KSZ8795
  ynl: make the tooling check the license
  ynl: broaden the license even more
  tools: ynl: make definitions optional again
  hsr: ratelimit only when errors are printed
  qed/qed_mng_tlv: correctly zero out ->min instead of ->hour
  selftests: net: devlink_port_split.py: skip test if no suitable device available
  ...

Pull block fixes from Jens Axboe:
 "A bit bigger than usual, as the NVMe pull request missed last weeks
  submission. In detail:

   - NVMe pull request via Christoph:
        - Avoid potential UAF in nvmet_req_complete (Damien Le Moal)
        - More quirks (Elmer Miroslav Mosher Golovin, Philipp Geulen)
        - Fix a memory leak in the nvme-pci probe teardown path
          (Irvin Cote)
        - Repair the MAINTAINERS entry (Lukas Bulwahn)
        - Fix handling single range discard request (Ming Lei)
        - Show more opcode names in trace events (Minwoo Im)
        - Fix nvme-tcp timeout reporting (Sagi Grimberg)

   - MD pull request via Song:
        - Two fixes for old issues (Neil)
        - Resource leak in device stopping (Xiao)

   - Bio based device stats fix (Yu)

   - Kill unused CONFIG_BLOCK_COMPAT (Lukas)

   - sunvdc missing mdesc_grab() failure check (Liang)

   - Fix for reversal of request ordering upon issue for certain cases
     (Jan)

   - null_blk timeout fixes (Damien)

   - Loop use-after-free fix (Bart)

   - blk-mq SRCU fix for BLK_MQ_F_BLOCKING devices (Chris)"

* tag 'block-6.3-2023-03-16' of git://git.kernel.dk/linux:
  block: remove obsolete config BLOCK_COMPAT
  md: select BLOCK_LEGACY_AUTOLOAD
  block: count 'ios' and 'sectors' when io is done for bio-based device
  block: sunvdc: add check for mdesc_grab() returning NULL
  nvmet: avoid potential UAF in nvmet_req_complete()
  nvme-trace: show more opcode names
  nvme-tcp: add nvme-tcp pdu size build protection
  nvme-tcp: fix opcode reporting in the timeout handler
  nvme-pci: add NVME_QUIRK_BOGUS_NID for Lexar NM620
  nvme-pci: add NVME_QUIRK_BOGUS_NID for Netac NV3000
  nvme-pci: fixing memory leak in probe teardown path
  nvme: fix handling single range discard request
  MAINTAINERS: repair malformed T: entries in NVM EXPRESS DRIVERS
  block: null_blk: cleanup null_queue_rq()
  block: null_blk: Fix handling of fake timeout request
  blk-mq: fix "bad unlock balance detected" on q->srcu in __blk_mq_run_dispatch_ops
  loop: Fix use-after-free issues
  block: do not reverse request order when flushing plug list
  md: avoid signed overflow in slot_store()
  md: Free resources in __md_stop

Pull io_uring fixes from Jens Axboe:

 - When PF_NO_SETAFFINITY was removed for io-wq threads, we kind of
   forgot about the SQPOLL thread. Remove it there as well, there's even
   less of a reason to set it there (Michal)

 - Fixup a confusing 'ret' setting (Li)

 - When MSG_RING is used to send a direct descriptor to another ring,
   it's possible to have it allocate it on the target ring rather than
   provide a specific index for it. If this is done, return the chosen
   value in the CQE, like we would've done locally (Pavel)

 - Fix a regression in this series on huge page bvec collapsing (Pavel)

* tag 'io_uring-6.3-2023-03-16' of git://git.kernel.dk/linux:
  io_uring/rsrc: fix folio accounting
  io_uring/msg_ring: let target know allocated index
  io_uring: rsrc: Optimize return value variable 'ret'
  io_uring/sqpoll: Do not set PF_NO_SETAFFINITY on sqpoll threads

Pull power management fixes from Rafael Wysocki:
 "These fix an error code path issue in a cpuidle driver and make the
  sleepgraph utility more robust against unexpected input.

  Specifics:

   - Fix the psci_pd_init_topology() failure path in the PSCI cpuidle
     driver (Shawn Guo)

   - Modify the sleepgraph utility so it does not crash on binary data
     in device names (Todd Brandt)"

* tag 'pm-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  pm-graph: sleepgraph: Avoid crashing on binary data in device names
  cpuidle: psci: Iterate backwards over list in psci_pd_remove()

Pull ACPI fixes from Rafael Wysocki:
 "These add some new quirks, fix PPTT handling, fix an ACPI utility and
  correct a mistake in the ACPI documentation.

  Specifics:

   - Fix ACPI PPTT handling to avoid sleep in the atomic context when it
     is not present (Sudeep Holla)

   - Add 'backlight=native' DMI quirk for Dell Vostro 15 3535 to the
     ACPI video driver (Chia-Lin Kao)

   - Add ACPI quirks for I2C device enumeration on Lenovo Yoga Book X90
     and Acer Iconia One 7 B1-750 (Hans de Goede)

   - Fix handling of invalid command line option values in the ACPI
     pfrut utility (Chen Yu)

   - Fix references to I2C device data type in the ACPI documentation
     for device enumeration (Andy Shevchenko)"

* tag 'acpi-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: tools: pfrut: Check if the input of level and type is in the right numeric range
  ACPI: PPTT: Fix to avoid sleep in the atomic context when PPTT is absent
  ACPI: x86: Add skip i2c clients quirk for Lenovo Yoga Book X90
  ACPI: x86: Add skip i2c clients quirk for Acer Iconia One 7 B1-750
  ACPI: x86: Introduce an acpi_quirk_skip_gpio_event_handlers() helper
  ACPI: video: Add backlight=native DMI quirk for Dell Vostro 15 3535
  ACPI: docs: enumeration: Correct reference to the I²C device data type

Pull turbostat fweaks and fixes from Len Brown:
 "Leprechaun sized fixes and tweaks touching only turbostat.

  'Keeping happy users happy since 2010'"

* 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
  tools/power turbostat: version 2023.03.17
  tools/power turbostat: fix decoding of HWP_STATUS
  tools/power turbostat: Introduce support for EMR
  tools/power turbostat: remove stray newlines from warn/warnx strings
  tools/power turbostat: Fix /dev/cpu_dma_latency warnings
  tools/power turbostat: Provide better debug messages for failed capabilities accesses
  tools/power turbostat: update dump of SECONDARY_TURBO_RATIO_LIMIT

Pull xen fixes from Juergen Gross:

 - cleanup for xen time handling

 - enable the VGA console in a Xen PVH dom0

 - cleanup in the xenfs driver

* tag 'for-linus-6.3-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: remove unnecessary (void*) conversions
  x86/PVH: obtain VGA console info in Dom0
  x86/xen/time: cleanup xen_tsc_safe_clocksource
  xen: update arch/x86/include/asm/xen/cpuid.h

Pull RISC-V fixes from Palmer Dabbelt:

 - fixes to the ASID allocator to avoid leaking stale mappings between
   tasks

 - fix the vmalloc fault handler to tolerate huge pages

* tag 'riscv-for-linus-6.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  RISC-V: mm: Support huge page in vmalloc_fault()
  riscv: asid: Fixup stale TLB entry cause application crash
  Revert "riscv: mm: notify remote harts about mmu cache updates"