linux-kernel - [PATCH 6/6] sched: cpufreq: Optimize cpufreq_update_this

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Date:   Wed, 24 May 2017 10:59:57 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 6/6] sched: cpufreq: Optimize cpufreq_update_this_cpu() a bit

smp_processor_id() can result in a function call if CONFIG_DEBUG_PREEMPT
is enabled. It would be much straight forward to use this_rq() macro
instead.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 kernel/sched/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index bcdf6a136c59..4220ec76d643 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1995,7 +1995,7 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
 
 static inline void cpufreq_update_this_cpu(struct rq *rq, unsigned int flags)
 {
-	if (cpu_of(rq) == smp_processor_id())
+	if (rq == this_rq())
 		cpufreq_update_util(rq, flags);
 }
 #else
-- 
2.13.0.70.g6367777092d9