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Message-ID: <20070824165315.GA1785@tv-sign.ru>
Date: Fri, 24 Aug 2007 20:53:15 +0400
From: Oleg Nesterov <oleg@...sign.ru>
To: Andrew Morton <akpm@...ux-foundation.org>,
Cliff Wickman <cpw@....com>, Gautham R Shenoy <ego@...ibm.com>,
Ingo Molnar <mingo@...e.hu>,
Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] migration_call(CPU_DEAD): use spin_lock_irq() instead of task_rq_lock()
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@...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);
-
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