From: David Simner <djs203@srcf.ucam.org>
Date: Tue, 29 Apr 2008 09:08:59 +0000 (+0100)
Subject: sched: fix sched_info_switch not being called according to documentation
X-Git-Tag: v2.6.26-rc2~62^2~8
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=673a90a1e05c8127886f7659d1a457169378371f;p=linux-2.6

sched: fix sched_info_switch not being called according to documentation

http://bugzilla.kernel.org/show_bug.cgi?id=10545

sched_stats.h says that __sched_info_switch is "called when prev !=
next" in the comment.  sched.c should therefore do that.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index bee9cbe13c..3ac3d7af04 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4662,9 +4662,9 @@ need_resched_nonpreemptible:
 	prev->sched_class->put_prev_task(rq, prev);
 	next = pick_next_task(rq, prev);
 
-	sched_info_switch(prev, next);
-
 	if (likely(prev != next)) {
+		sched_info_switch(prev, next);
+
 		rq->nr_switches++;
 		rq->curr = next;
 		++*switch_count;