[tip:sched/urgent] sched: Initialize power_orig for overlapping groups

[tip-bot for Peter Zijlstra]

Commit-ID:  8e8339a3a1069141985daaa2521ba304509ddecd
Gitweb:     http://git.kernel.org/tip/8e8339a3a1069141985daaa2521ba304509ddecd
Author:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 11 Dec 2013 11:09:53 +0100
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 11 Dec 2013 15:47:59 +0100

sched: Initialize power_orig for overlapping groups

Yinghai reported that he saw a /0 in sg_capacity on his EX parts.
Make sure to always initialize power_orig now that we actually use it.

Ideally build_sched_domains() -> init_sched_groups_power() would also
initialize this; but for some yet unexplained reason some setups seem
to miss updates there.

Reported-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Tested-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-l8ng2m9uml6fhibln8wqpom7@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/sched/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e85cda2..19af58f 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5112,6 +5112,7 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 		 * die on a /0 trap.
 		 */
 		sg->sgp->power = SCHED_POWER_SCALE * cpumask_weight(sg_span);
+		sg->sgp->power_orig = sg->sgp->power;
 
 		/*
 		 * Make sure the first group of this domain contains the
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