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sched/core: Avoid double update_rq_clock() in move_queued_task()

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Address this case:

  WARNING: CPU: 0 PID: 2070 at ../kernel/sched/core.c:109 update_rq_clock+0x74/0x80
  rq->clock_update_flags & RQCF_UPDATED

  Call Trace:
  update_rq_clock()
  move_queued_task()
  __set_cpus_allowed_ptr()
  ...

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2016-10-05 17:59:32 +02:00 committed by Ingo Molnar
parent 5704ac0ae7
commit 15ff991e80
1 changed files with 2 additions and 1 deletions
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3
kernel/sched/core.c
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@ -948,7 +948,7 @@ static struct rq *move_queued_task(struct rq *rq, struct rq_flags *rf,
lockdep_assert_held(&rq->lock);
p->on_rq = TASK_ON_RQ_MIGRATING;
dequeue_task(rq, p, 0);
dequeue_task(rq, p, DEQUEUE_NOCLOCK);
set_task_cpu(p, new_cpu);
rq_unlock(rq, rf);
@ -987,6 +987,7 @@ static struct rq *__migrate_task(struct rq *rq, struct rq_flags *rf,
if (!cpumask_test_cpu(dest_cpu, &p->cpus_allowed))
return rq;
update_rq_clock(rq);
rq = move_queued_task(rq, rf, p, dest_cpu);
return rq;