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Fix a combined PEBS events bug on x86 Intel CPUs.

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2024-04-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 perf fix from Ingo Molnar:
 "Fix a combined PEBS events bug on x86 Intel CPUs"

* tag 'perf-urgent-2024-04-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/ds: Don't clear ->pebs_data_cfg for the last PEBS event
This commit is contained in:
Linus Torvalds 2024-04-07 09:14:46 -07:00
commit e2948effa9
1 changed files with 4 additions and 4 deletions
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8
arch/x86/events/intel/ds.c
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@ -1237,11 +1237,11 @@ pebs_update_state(bool needed_cb, struct cpu_hw_events *cpuc,
struct pmu *pmu = event->pmu;
/*
* Make sure we get updated with the first PEBS
* event. It will trigger also during removal, but
* that does not hurt:
* Make sure we get updated with the first PEBS event.
* During removal, ->pebs_data_cfg is still valid for
* the last PEBS event. Don't clear it.
*/
if (cpuc->n_pebs == 1)
if ((cpuc->n_pebs == 1) && add)
cpuc->pebs_data_cfg = PEBS_UPDATE_DS_SW;
if (needed_cb != pebs_needs_sched_cb(cpuc)) {