Messages in this thread Patch in this message | | | Date | Fri, 24 Aug 2007 20:53:15 +0400 | From | Oleg Nesterov <> | Subject | [PATCH 2/2] migration_call(CPU_DEAD): use spin_lock_irq() instead of task_rq_lock() |
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Change migration_call(CPU_DEAD) to use direct spin_lock_irq() instead of task_rq_lock(rq->idle), rq->idle can't change its task_rq().
This makes the code a bit more symmetrical with migrate_dead_tasks()'s path which uses spin_lock_irq/spin_unlock_irq.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- t/kernel/sched.c~2_RQ_LOCK 2007-08-24 20:31:03.000000000 +0400 +++ t/kernel/sched.c 2007-08-24 20:37:17.000000000 +0400 @@ -5381,13 +5381,13 @@ migration_call(struct notifier_block *nf kthread_stop(rq->migration_thread); rq->migration_thread = NULL; /* Idle task back to normal (off runqueue, low prio) */ - rq = task_rq_lock(rq->idle, &flags); + spin_lock_irq(&rq->lock); deactivate_task(rq, rq->idle, 0); rq->idle->static_prio = MAX_PRIO; __setscheduler(rq, rq->idle, SCHED_NORMAL, 0); rq->idle->sched_class = &idle_sched_class; migrate_dead_tasks(cpu); - task_rq_unlock(rq, &flags); + spin_unlock_irq(&rq->lock); migrate_nr_uninterruptible(rq); BUG_ON(rq->nr_running != 0); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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