perf/x86/intel/pt: Use bitwise access for PERF_HES_STOPPED

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The Intel PT driver reads and writes event->hw.state as a whole value,
assuming it is either 0 or PERF_HES_STOPPED.  That is true today, but a
subsequent fix needs to also track an open AUX output buffer using the
PERF_HES_UPTODATE bit of the same field.

When more than one bit can be set, whole-value assignments would
overwrite the other bits and whole-value comparisons would fail to match.

Convert all accesses to set, clear and test the PERF_HES_STOPPED bit
individually, in preparation for that change.

No functional change intended: event->hw.state currently only ever
holds 0 or PERF_HES_STOPPED, so the bitwise forms are equivalent.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yi Lai <yi1.lai@intel.com>
Link: https://patch.msgid.link/20260721070254.13557-3-adrian.hunter@intel.com

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Adrian Hunter 2026-07-21 10:02:53 +03:00 • committed by Peter Zijlstra

parent c6df517796

commit 265bb4ef75

1 changed files with 8 additions and 8 deletions

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arch/x86/events/intel/pt.c

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