sched: only update rq->clock while holding rq->lock

Vatsa noticed rq->clock going funny and tracked it down to an update_rq_clock()
outside a rq->lock section.

This is a problem because things like double_rq_lock() update the rq->clock
value for both rqs. Therefore disabling interrupts isn't strong enough.

Reported-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index 6f23059..c530b84 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4441,12 +4441,8 @@ need_resched_nonpreemptible:
        if (sched_feat(HRTICK))
                hrtick_clear(rq);
 
-       /*
-        * Do the rq-clock update outside the rq lock:
-        */
-       local_irq_disable();
+       spin_lock_irq(&rq->lock);
        update_rq_clock(rq);
-       spin_lock(&rq->lock);
        clear_tsk_need_resched(prev);
 
        if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {