The mapping of perf_events generic hardware events to actual PMU events on
ARM PMUv3 may not always be correct. This is in particular true for the
PERF_COUNT_HW_BRANCH_INSTRUCTIONS event. Although the mapping points to an
architected event, it may not always be available. This can be seen with a
simple:

$ perf stat -e branches sleep 0
 Performance counter stats for 'sleep 0':

   <not supported>      branches

       0.001401081 seconds time elapsed

Yet the hardware does have an event that could be used for branches.

Dynamically check for a supported hardware event which can be used for
PERF_COUNT_HW_BRANCH_INSTRUCTIONS at mapping time.

And with that:

$ perf stat -e branches sleep 0

 Performance counter stats for 'sleep 0':

           166,739      branches

       0.000832163 seconds time elapsed
Co-developed-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Co-developed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Co-developed-by: Peter Newman <peternewman@google.com>
Signed-off-by: Peter Newman <peternewman@google.com>
Link: https://lore.kernel.org/all/YvunKCJHSXKz%2FkZB@FVFF77S0Q05N
Link: https://lore.kernel.org/r/20230411093809.657501-1-peternewman@google.comSigned-off-by: Will Deacon <will@kernel.org>

DTC cycle count events don't have anything to validate or initialise in
themselves, but we should not forget to still validate their whole group
context. Otherwise, we may fail to correctly reject a contrived group
containing an impossible number of cycles events.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/3124e8c276a1f513c1a415dc839ca4181b3c8bc8.1680522545.git.robin.murphy@arm.comSigned-off-by: Will Deacon <will@kernel.org>

This reverts commit 3b16f626.

Selecting a Kconfig option that has its own set of dependencies tends to
end badly, and in this case 'randconfig' builds blew up on 32-bit ARM
where ARM_PMUV3 was being selecting with HW_PERF_EVENTS=n:

  |    drivers/perf/arm_pmuv3.c:68:5: error: use of undeclared identifier 'DTLB'
  |            [C(DTLB)][C(OP_READ)][C(RESULT_ACCESS)] = ARMV8_PMUV3_PERFCTR_L1D_TLB,
  |               ^
  |    fatal error: too many errors emitted, stopping now [-ferror-limit=]
  |    20 errors generated.
  |
  | Kconfig warnings: (for reference only)
  |    WARNING: unmet direct dependencies detected for ARM_PMUV3
  |    Depends on [n]: PERF_EVENTS [=y] && HW_PERF_EVENTS [=n] && (ARM [=y] && CPU_V7 [=y] || ARM64)
  |    Selected by [y]:
  |    - ARCH_VIRT [=y] && ARCH_MULTI_V7 [=y] && PERF_EVENTS [=y]

As suggested by Marc, just drop the 'select' clause altogether by
reverting the patch which introduced it.

Link: https://lore.kernel.org/r/202303281539.zzI4vpw1-lkp@intel.comReported-by: kernel test robot <lkp@intel.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>

The PMU itself is compatible with the one found on M1. We still know
next to nothing about the counters so keep using CPU uarch specific
compatibles/PMU names.
Signed-off-by: Janne Grunau <j@jannau.net>
Acked-by: Mark Rutland <mark.rutland@arm.com.
Reviewed-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20230214-apple_m2_pmu-v1-2-9c9213ab9b63@jannau.netSigned-off-by: Will Deacon <will@kernel.org>

The PMUs on the Apple M2 cores avalanche and blizzard CPU are compatible
with M1 ones. As on M1 we don't know exactly what the counters count so
use a distinct compatible for each micro-architecture.
Apple's PMU counter description omits a counter for M2 so there
is some variation on the interpretation of the counters.
Signed-off-by: Janne Grunau <j@jannau.net>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20230214-apple_m2_pmu-v1-1-9c9213ab9b63@jannau.netSigned-off-by: Will Deacon <will@kernel.org>

Fix warning message from smatch tool:
  | smatch warnings:
  | drivers/perf/arm_cspmu/arm_cspmu.c:1075 arm_cspmu_find_cpu_container()
  |    warn: variable dereferenced before check 'cpu_dev' (see line 1073)
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/202302191227.kc0V8fM7-lkp@intel.com/Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Besar Wicaksono <bwicaksono@nvidia.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230302205701.35323-1-bwicaksono@nvidia.comSigned-off-by: Will Deacon <will@kernel.org>

The 3th argument of for_each_set_bit is incorrect, fix them.

Fixes: 2016e211 ("perf/amlogic: Add support for Amlogic meson G12 SoC DDR PMU driver")
Signed-off-by: Jiucheng Xu <jiucheng.xu@amlogic.com>
Link: https://lore.kernel.org/r/20230209115403.521868-1-jiucheng.xu@amlogic.comSigned-off-by: Will Deacon <will@kernel.org>

Convert platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230216063403.9753-1-yang.lee@linux.alibaba.comSigned-off-by: Will Deacon <will@kernel.org>

Since commit 8b41fc44 ("kbuild: create modules.builtin without
Makefile.modbuiltin or tristate.conf"), MODULE_LICENSE declarations
are used to identify modules. As a consequence, uses of the macro
in non-modules will cause modprobe to misidentify their containing
object file as a module when it is not (false positives), and modprobe
might succeed rather than failing with a suitable error message.

So remove it in the files in this commit, none of which can be built as
modules.
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Suggested-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: linux-modules@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230217141059.392471-9-nick.alcock@oracle.comSigned-off-by: Will Deacon <will@kernel.org>

According to commit 890cc39a ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230315023108.36953-1-yang.lee@linux.alibaba.comSigned-off-by: Will Deacon <will@kernel.org>

According to commit 890cc39a ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230315023017.35789-1-yang.lee@linux.alibaba.comSigned-off-by: Will Deacon <will@kernel.org>

As eventid field was expanded to support new mesh versions, it started to
overlap with wp_combine field. Move wp_combine to fix the issue.

Fixes: 23760a01 ("perf/arm-cmn: Add CMN-700 support")
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20230301175540.19891-1-ilkka@os.amperecomputing.comSigned-off-by: Will Deacon <will@kernel.org>

Since 32bit guests are not unlikely to run on an ARMv8 host,
let's select the PMUv3 driver, which allows the PMU to be used
on such systems.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-9-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

The only thing stopping the PMUv3 driver from compiling on 32bit
is the lack of defined system registers names and the handful of
required helpers.

This is easily solved by providing the sysreg accessors and updating
the Kconfig entry.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Co-developed-by: Zaid Al-Bassam <zalbassam@google.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-8-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

ARMv8 is a superset of ARMv7, and all the ARMv8 features are
discoverable with a set of ID registers. It means that we can
use CPU_V7 to guard ARMv8 features at compile time.

This commit simply amends the CPU_V7 configuration symbol comment
to reflect that CPU_V7 also covers ARMv8.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-7-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

GENMASK macro uses "unsigned long" (32-bit wide on arm and 64-bit
on arm64), This causes build issues when enabling PMUv3 on arm as
it tries to access bits > 31. This patch switches the GENMASK to
GENMASK_ULL, which uses "unsigned long long" (64-bit on both arm
and arm64).
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-6-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

KVM host support is available only on arm64.

By moving the inclusion of kvm_host.h to an arm64-specific file,
the 32bit architecture will be able to implement dummy helpers.
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-5-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

The current PMU version definitions are available for arm64 only,
As we want to add PMUv3 support to arm (32-bit), abstracts
these definitions by using arch-specific helpers.
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-4-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

As we want to enable 32bit support, we need to distanciate the
PMUv3 driver from the AArch64 system register names.

This patch moves all system register accesses to an architecture
specific include file, allowing the 32bit counterpart to be
slotted in at a later time.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Co-developed-by: Zaid Al-Bassam <zalbassam@google.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-3-zalbassam@google.comSigned-off-by: Will Deacon <will@kernel.org>

Having the ARM PMUv3 driver sitting in arch/arm64/kernel is getting
in the way of being able to use perf on ARMv8 cores running a 32bit
kernel, such as 32bit KVM guests.

This patch moves it into drivers/perf/arm_pmuv3.c, with an include
file in include/linux/perf/arm_pmuv3.h. The only thing left in
arch/arm64 is some mundane perf stuff.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-2-zalbassam@google.comSigned-off-by: Will Deacon <will@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