linux-kernel - [tip:sched/core] sched: Pass 'struct rq' to on_null

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Date:	Mon, 13 Jan 2014 07:55:49 -0800
From:	tip-bot for Daniel Lezcano <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, tglx@...utronix.de, daniel.lezcano@...aro.org
Subject: [tip:sched/core] sched: Pass 'struct rq' to on_null_domain()

Commit-ID:  63f609b160151c9e86b26b935c9671a23afe299f
Gitweb:     http://git.kernel.org/tip/63f609b160151c9e86b26b935c9671a23afe299f
Author:     Daniel Lezcano <daniel.lezcano@...aro.org>
AuthorDate: Mon, 6 Jan 2014 12:34:40 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 13 Jan 2014 13:47:28 +0100

sched: Pass 'struct rq' to on_null_domain()

The on_null_domain() function is getting the cpu to retrieve the struct rq
associated with it.

Pass 'struct rq' directly to the function as the caller already has the info.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1389008085-9069-4-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c47b1ce..fc0afc5 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6868,9 +6868,9 @@ static void run_rebalance_domains(struct softirq_action *h)
 	nohz_idle_balance(this_cpu, idle);
 }
 
-static inline int on_null_domain(int cpu)
+static inline int on_null_domain(struct rq *rq)
 {
-	return !rcu_dereference_sched(cpu_rq(cpu)->sd);
+	return !rcu_dereference_sched(rq->sd);
 }
 
 /*
@@ -6882,10 +6882,10 @@ void trigger_load_balance(struct rq *rq)
 
 	/* Don't need to rebalance while attached to NULL domain */
 	if (time_after_eq(jiffies, rq->next_balance) &&
-	    likely(!on_null_domain(cpu)))
+	    likely(!on_null_domain(rq)))
 		raise_softirq(SCHED_SOFTIRQ);
 #ifdef CONFIG_NO_HZ_COMMON
-	if (nohz_kick_needed(rq) && likely(!on_null_domain(cpu)))
+	if (nohz_kick_needed(rq) && likely(!on_null_domain(rq)))
 		nohz_balancer_kick(cpu);
 #endif
 }
--
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