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authorPeter Zijlstra <peterz@infradead.org>2013-10-03 16:02:23 +0200
committerIngo Molnar <mingo@kernel.org>2013-10-04 09:58:53 +0200
commit9886167d20c0720dcfb01e62cdff4d906b226f43 (patch)
treedff8fb937ae2c73fe474263da0e906aa77d6ae54 /arch
parentcac6653529eeac9b661fc8342c47d849c3adb085 (diff)
perf: Fix perf_pmu_migrate_context
While auditing the list_entry usage due to a trinity bug I found that perf_pmu_migrate_context violates the rules for perf_event::event_entry. The problem is that perf_event::event_entry is a RCU list element, and hence we must wait for a full RCU grace period before re-using the element after deletion. Therefore the usage in perf_pmu_migrate_context() which re-uses the entry immediately is broken. For now introduce another list_head into perf_event for this specific usage. This doesn't actually fix the trinity report because that never goes through this code. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-mkj72lxagw1z8fvjm648iznw@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
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