linux-kernel - [PATCH RESEND] events:core.c: Use built-in RCU list checking

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Message-Id: <20200214164454.19942-1-madhuparnabhowmik10@gmail.com>
Date:   Fri, 14 Feb 2020 22:14:54 +0530
From:   madhuparnabhowmik10@...il.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com
Cc:     linux-kernel@...r.kernel.org, namhyung@...nel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        joel@...lfernandes.org, frextrite@...il.com,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Subject: [PATCH RESEND] events:core.c: Use built-in RCU list checking

From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>

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@...il.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