linux-kernel - [patch] BFS 421-1: fix selecting CPU for migrating nohz timer

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Message-ID: <CAJd=RBDx7Hwd1fjnGEdFny2XNHmvjRGQkCJySYK5+vfSfRFbrg@mail.gmail.com>
Date:	Thu, 5 Jul 2012 20:31:30 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Hillf Danton <dhillf@...il.com>
Subject: [patch] BFS 421-1: fix selecting CPU for migrating nohz timer

Bail out walking the hierarchy of schedule domain only if a busy CPU
is discovered.

SOB: Hillf Danton <dhillf@...il.com>
---

--- a/kernel/sched/bfs.c	Thu Jul  5 20:12:06 2012
+++ b/kernel/sched/bfs.c	Thu Jul  5 20:12:50 2012
@@ -4937,9 +4937,10 @@ int get_nohz_timer_target(void)
 	rcu_read_lock();
 	for_each_domain(cpu, sd) {
 		for_each_cpu(i, sched_domain_span(sd)) {
-			if (!idle_cpu(i))
+			if (!idle_cpu(i)) {
 				cpu = i;
-			goto unlock;
+				goto unlock;
+			}
 		}
 	}
 unlock:
--
--
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