sched: Add missing rcu protection to wake_up_all_idle_cpus
authorAndy Lutomirski <luto@amacapital.net>
Sat, 29 Nov 2014 16:13:51 +0000 (08:13 -0800)
committerIngo Molnar <mingo@kernel.org>
Mon, 8 Dec 2014 10:44:19 +0000 (11:44 +0100)
commitfd7de1e8d5b2b2b35e71332fafb899f584597150
tree7b0ff7aad0d8c984748557dfec52fad02b54a045
parent36ce98818a4df66c8134c31fd6e768b4119c7a90
sched: Add missing rcu protection to wake_up_all_idle_cpus

Locklessly doing is_idle_task(rq->curr) is only okay because of
RCU protection.  The older variant of the broken code checked
rq->curr == rq->idle instead and therefore didn't need RCU.

Fixes: f6be8af1c95d ("sched: Add new API wake_up_if_idle() to wake up the idle cpu")
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Chuansheng Liu <chuansheng.liu@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/729365dddca178506dfd0a9451006344cd6808bc.1417277372.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/sched/core.c