linux-kernel - [tip:sched/core] sched, nohz: Fix the idle cpu check in nohz_idle

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Date:	Tue, 6 Dec 2011 12:24:09 -0800
From:	tip-bot for Suresh Siddha <suresh.b.siddha@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, vatsa@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	suresh.b.siddha@...el.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched, nohz: Fix the idle cpu check in nohz_idle_balance

Commit-ID:  8a6d42d1b32ad239c28f445138ea9c19aa52dd20
Gitweb:     http://git.kernel.org/tip/8a6d42d1b32ad239c28f445138ea9c19aa52dd20
Author:     Suresh Siddha <suresh.b.siddha@...el.com>
AuthorDate: Tue, 6 Dec 2011 11:19:37 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 6 Dec 2011 20:51:27 +0100

sched, nohz: Fix the idle cpu check in nohz_idle_balance

cpu bit in the nohz.idle_cpu_mask are reset in the first busy tick after
exiting idle. So during nohz_idle_balance(), intention is to double
check if the cpu that is part of the idle_cpu_mask is indeed idle before
going ahead in performing idle balance for that cpu.

Fix the cpu typo in the idle_cpu() check during nohz_idle_balance().

Reported-by: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1323199177.1984.12.camel@sbsiddha-desk.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched/fair.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4174338..8be45ed 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5020,7 +5020,7 @@ static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
 		goto end;
 
 	for_each_cpu(balance_cpu, nohz.idle_cpus_mask) {
-		if (balance_cpu == this_cpu || !idle_cpu(this_cpu))
+		if (balance_cpu == this_cpu || !idle_cpu(balance_cpu))
 			continue;
 
 		/*
--
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