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workqueue: add WARN_ON_ONCE() on CPU number to wq_worker_waking_up()

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Recently, workqueue code has gone through some changes and we found
some bugs related to concurrency management operations happening on
the wrong CPU.  When a worker is concurrency managed
(!WORKER_NOT_RUNNIG), it should be bound to its associated cpu and
woken up to that cpu.  Add WARN_ON_ONCE() to verify this.

Signed-off-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Joonsoo Kim 2012-10-26 23:03:49 +09:00 committed by Tejun Heo
parent 999767beb1
commit 3657600040
1 changed files with 3 additions and 1 deletions
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4
kernel/workqueue.c
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@ -739,8 +739,10 @@ void wq_worker_waking_up(struct task_struct *task, unsigned int cpu)
{
struct worker *worker = kthread_data(task);
if (!(worker->flags & WORKER_NOT_RUNNING))
if (!(worker->flags & WORKER_NOT_RUNNING)) {
WARN_ON_ONCE(worker->pool->gcwq->cpu != cpu);
atomic_inc(get_pool_nr_running(worker->pool));
}
}
/**