Commit 9f0bff11 authored Nov 19, 2019 by Sebastian Andrzej Siewior Committed by Peter Zijlstra Dec 17, 2019

perf/core: Add SRCU annotation for pmus list walk



Since commit
   28875945 ("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

parent 92ca7da4

kernel/events/core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -10523,7 +10523,7 @@ again:
		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;

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