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perf/core: Add SRCU annotation for pmus list walk 

Since commit
   28875945ba ("rcu: Add support for consolidated-RCU reader checking")

there is an additional check to ensure that a RCU related lock is held
while the RCU list is iterated.
This section holds the SRCU reader lock instead.

Add annotation to list_for_each_entry_rcu() that pmus_srcu must be
acquired during the list traversal.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Link: https://lkml.kernel.org/r/20191119121429.zhcubzdhm672zasg@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2019-11-19 13:14:29 +01:00 committed by Peter Zijlstra
parent 92ca7da4bd
commit 9f0bff1180
1 changed files with 1 additions and 1 deletions
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2
kernel/events/core.c
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@ -10523,7 +10523,7 @@ static struct pmu *perf_init_event(struct perf_event *event)
goto unlock;
}
list_for_each_entry_rcu(pmu, &pmus, entry) {
list_for_each_entry_rcu(pmu, &pmus, entry, lockdep_is_held(&pmus_srcu)) {
ret = perf_try_init_event(pmu, event);
if (!ret)
goto unlock;