perfcounters, x86: simplify disable/enable of counters

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Impact: fix spurious missed counter wakeups

In the case of NMI events, close a race window that can occur if an NMI
hits counter code that temporarily disables+enables a counter, and the NMI
leaks into the disabled section.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Ingo Molnar 2008-12-09 11:40:46 +01:00

parent 4c59e4676d

commit 7e2ae34749

1 changed files with 28 additions and 12 deletions

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arch/x86/kernel/cpu/perf_counter.c

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