linux-kernel - [PATCH 05/11] sched/fair: Add missing annotation for nohz_newidle

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Message-Id: <ca8c5c88a5882a4b7e243be73b4f0402e9da9cc2.1581282103.git.jbi.octave@gmail.com>
Date:   Sun,  9 Feb 2020 22:37:39 +0000
From:   Jules Irenge <jbi.octave@...il.com>
To:     boqun.feng@...il.com
Cc:     juri.lelli@...hat.com, peterz@...radead.org, mingo@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        linux-kernel@...r.kernel.org, Jules Irenge <jbi.octave@...il.com>
Subject: [PATCH 05/11] sched/fair: Add missing annotation for nohz_newidle_balance()

Sparse reports a warning at nohz_newidle_balance()
warning: context imbalance in nohz_newidle_balance() - wrong count at exit
The root cause is a missing annotation

Add the missing __must_hold(this_rq->lock)

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fe4e0d775375..81f8a440469a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10050,7 +10050,7 @@ static bool nohz_idle_balance(struct rq *this_rq, enum cpu_idle_type idle)
 	return true;
 }
 
-static void nohz_newidle_balance(struct rq *this_rq)
+static void nohz_newidle_balance(struct rq *this_rq) __must_hold(&this_rq->lock)
 {
 	int this_cpu = this_rq->cpu;
 
-- 
2.24.1