diff options
| -rw-r--r-- | kernel/sched/core.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 71b836034912..a773c919d88d 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4679,20 +4679,20 @@ EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr); */ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu) { - struct rq *rq_dest, *rq_src; + struct rq *rq; int ret = 0; if (unlikely(!cpu_active(dest_cpu))) return ret; - rq_src = cpu_rq(src_cpu); - rq_dest = cpu_rq(dest_cpu); + rq = cpu_rq(src_cpu); raw_spin_lock(&p->pi_lock); - double_rq_lock(rq_src, rq_dest); + raw_spin_lock(&rq->lock); /* Already moved. */ if (task_cpu(p) != src_cpu) goto done; + /* Affinity changed (again). */ if (!cpumask_test_cpu(dest_cpu, tsk_cpus_allowed(p))) goto fail; @@ -4702,15 +4702,22 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu) * placed properly. */ if (task_on_rq_queued(p)) { - dequeue_task(rq_src, p, 0); + dequeue_task(rq, p, 0); + p->on_rq = TASK_ON_RQ_MIGRATING; set_task_cpu(p, dest_cpu); - enqueue_task(rq_dest, p, 0); - check_preempt_curr(rq_dest, p, 0); + raw_spin_unlock(&rq->lock); + + rq = cpu_rq(dest_cpu); + raw_spin_lock(&rq->lock); + BUG_ON(task_rq(p) != rq); + p->on_rq = TASK_ON_RQ_QUEUED; + enqueue_task(rq, p, 0); + check_preempt_curr(rq, p, 0); } done: ret = 1; fail: - double_rq_unlock(rq_src, rq_dest); + raw_spin_unlock(&rq->lock); raw_spin_unlock(&p->pi_lock); return ret; } |