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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-16 16:42:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-16 16:42:37 -0700 |
| commit | 151647ab581013b482893d4e2218cd29b005cd6b (patch) | |
| tree | 79ce01c0e430047f0adde58f065ad696f6121af3 /arch/x86/events/core.c | |
| parent | 923a327e8f2257ab7cd5485cb5d8db92c965dfca (diff) | |
| parent | e81859fe64ad42dccefe134d1696e0635f78d763 (diff) | |
Merge tag 'locking-core-2024-07-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
- Jump label fixes, including a perf events fix that originally
manifested as jump label failures, but was a serialization bug at the
usage site
- Mark down_write*() helpers as __always_inline, to improve WCHAN
debuggability
- Misc cleanups and fixes
* tag 'locking-core-2024-07-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/rwsem: Add __always_inline annotation to __down_write_common() and inlined callers
jump_label: Simplify and clarify static_key_fast_inc_cpus_locked()
jump_label: Clarify condition in static_key_fast_inc_not_disabled()
jump_label: Fix concurrency issues in static_key_slow_dec()
perf/x86: Serialize set_attr_rdpmc()
cleanup: Standardize the header guard define's name
Diffstat (limited to 'arch/x86/events/core.c')
| -rw-r--r-- | arch/x86/events/core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 5b0dd07b1ef1..acd367c45334 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2547,6 +2547,7 @@ static ssize_t set_attr_rdpmc(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count) { + static DEFINE_MUTEX(rdpmc_mutex); unsigned long val; ssize_t ret; @@ -2560,6 +2561,8 @@ static ssize_t set_attr_rdpmc(struct device *cdev, if (x86_pmu.attr_rdpmc_broken) return -ENOTSUPP; + guard(mutex)(&rdpmc_mutex); + if (val != x86_pmu.attr_rdpmc) { /* * Changing into or out of never available or always available, |