From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 8 Oct 2014 19:36:44 +0000 (+0200)
Subject: sched: Fix schedule_tail() to disable preemption
X-Git-Tag: omap-for-v3.19/fixes-rc1~165^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a43a14a5bd9c32dbd7af35e35a5afa703944bcb;p=pandora-kernel.git

sched: Fix schedule_tail() to disable preemption

finish_task_switch() enables preemption, so post_schedule(rq) can be
called on the wrong (and even dead) CPU. Afaics, nothing really bad
can happen, but in this case we can wrongly clear rq->post_schedule
on that CPU. And this simply looks wrong in any case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Kirill Tkhai <tkhai@yandex.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20141008193644.GA32055@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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