From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 16 Dec 2009 17:04:34 +0000 (+0100)
Subject: sched: Select_task_rq_fair() must honour SD_LOAD_BALANCE
X-Git-Tag: firefly_0821_release~11625^2~477
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8e04c81a2240ac2fc5d9efe804388526331ccac7;p=firefly-linux-kernel-4.4.55.git

sched: Select_task_rq_fair() must honour SD_LOAD_BALANCE

commit e4f4288842ee12747e10c354d72be7d424c0b627 upstream.

We should skip !SD_LOAD_BALANCE domains.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <20091216170517.653578430@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5488a5d3bc0e..199228b24bbc 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1374,6 +1374,9 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag
 
 	rcu_read_lock();
 	for_each_domain(cpu, tmp) {
+		if (!(tmp->flags & SD_LOAD_BALANCE))
+			continue;
+
 		/*
 		 * If power savings logic is enabled for a domain, see if we
 		 * are not overloaded, if so, don't balance wider.