mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-03-19 15:28:07 -04:00
Code Issues Packages Projects Releases Wiki Activity

perf/x86: Fix missing sample size update on AMD BRS

Browse Source 
It missed to convert a PERF_SAMPLE_BRANCH_STACK user to call the new
perf_sample_save_brstack() helper in order to update the dyn_size.
This affects AMD Zen3 machines with the branch-brs event.

Fixes: eb55b455ef ("perf/core: Add perf_sample_save_brstack() helper")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20230427030527.580841-1-namhyung@kernel.org
This commit is contained in:
Namhyung Kim
2023-04-26 20:05:27 -07:00
committed by Peter Zijlstra
parent 1d1bfe30da
commit 90befef5a9
1 changed files with 2 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/events/core.c
View File

@@ -1703,10 +1703,8 @@ int x86_pmu_handle_irq(struct pt_regs *regs)
perf_sample_data_init(&data, 0, event->hw.last_period);
if (has_branch_stack(event)) {
data.br_stack = &cpuc->lbr_stack;
data.sample_flags |= PERF_SAMPLE_BRANCH_STACK;
}
if (has_branch_stack(event))
perf_sample_save_brstack(&data, event, &cpuc->lbr_stack);
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);