From 15ff991e8047561bb4a4e800ec60f60939be5fd4 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 5 Oct 2016 17:59:32 +0200 Subject: [PATCH] sched/core: Avoid double update_rq_clock() in move_queued_task() 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) Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c6be770..c762f62 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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; -- 2.7.4