* [PATCH] events:core.c: Use built-in RCU list checking
@ 2020-01-18 3:06 Madhuparna Bhowmik
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From: Madhuparna Bhowmik @ 2020-01-18 3:06 UTC (permalink / raw)
To: peterz, --,
mingo, -c, jolsa, linux-kernel, joel, rcu, linux-kernel-mentees,
frextrite
list_for_each_entry_rcu has built-in RCU and lock checking.
Pass cond argument to list_for_each_entry_rcu() to silence
false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
by default.
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
---
kernel/events/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4ff86d57f9e5..04d28f3eb8df 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3760,7 +3760,8 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
raw_spin_lock(&ctx->lock);
perf_pmu_disable(ctx->pmu);
- list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
+ list_for_each_entry_rcu(event, &ctx->event_list, event_entry,
+ lockdep_is_held(&ctx->lock)) {
if (event->state != PERF_EVENT_STATE_ACTIVE)
continue;
--
2.17.1
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