linux-kernel - [tip:sched/core] sched: Assume *balance is valid

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Message-ID: <tip-8f190fb3f7a405682666d3723f6ec370b5afe4da@git.kernel.org>
Date:	Thu, 21 Jan 2010 13:54:11 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Assume *balance is valid

Commit-ID:  8f190fb3f7a405682666d3723f6ec370b5afe4da
Gitweb:     http://git.kernel.org/tip/8f190fb3f7a405682666d3723f6ec370b5afe4da
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Thu, 24 Dec 2009 14:18:21 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 21 Jan 2010 13:40:15 +0100

sched: Assume *balance is valid

Since all load_balance() callers will have !NULL balance parameters we
can now assume so and remove a few checks.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_fair.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index de5ab12..0b482f5 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -2465,7 +2465,7 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
 	 * to do the newly idle load balance.
 	 */
 	if (idle != CPU_NEWLY_IDLE && local_group &&
-	    balance_cpu != this_cpu && balance) {
+	    balance_cpu != this_cpu) {
 		*balance = 0;
 		return;
 	}
@@ -2528,7 +2528,7 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
 		update_sg_lb_stats(sd, group, this_cpu, idle, load_idx, sd_idle,
 				local_group, cpus, balance, &sgs);
 
-		if (local_group && balance && !(*balance))
+		if (local_group && !(*balance))
 			return;
 
 		sds->total_load += sgs.group_load;
@@ -2720,7 +2720,7 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
 	 * 5) The imbalance is within the specified limit.
 	 * 6) Any rebalance would lead to ping-pong
 	 */
-	if (balance && !(*balance))
+	if (!(*balance))
 		goto ret;
 
 	if (!sds.busiest || sds.busiest_nr_running == 0)
--
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