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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-05-09 02:34:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:52 -0700 |
| commit | 06ba38a9a0f6ceffe70343f684c5a690e3710ef4 (patch) | |
| tree | 500f4d8a3be212ececa80ead44d9658c8b7a4ce1 | |
| parent | c12920d19078eb8fd99560ec232a6e05c6ff1aa8 (diff) | |
| download | linux-06ba38a9a0f6ceffe70343f684c5a690e3710ef4.tar.gz linux-06ba38a9a0f6ceffe70343f684c5a690e3710ef4.tar.bz2 linux-06ba38a9a0f6ceffe70343f684c5a690e3710ef4.zip | |
workqueues: shift kthread_bind() from CPU_UP_PREPARE to CPU_ONLINE
CPU_UP_PREPARE binds cwq->thread to the new CPU. So CPU_UP_CANCELED tries to
wake up the task which is bound to the failed CPU.
With this patch we don't bind cwq->thread until CPU becomes online. The first
wake_up() after kthread_create() is a bit special, make a simple helper for
that.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/workqueue.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index e858e93886e3..7d1ebfc1a995 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -668,15 +668,21 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu) cwq->thread = p; cwq->should_stop = 0; - if (!is_single_threaded(wq)) - kthread_bind(p, cpu); - - if (is_single_threaded(wq) || cpu_online(cpu)) - wake_up_process(p); return 0; } +static void start_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu) +{ + struct task_struct *p = cwq->thread; + + if (p != NULL) { + if (cpu >= 0) + kthread_bind(p, cpu); + wake_up_process(p); + } +} + struct workqueue_struct *__create_workqueue(const char *name, int singlethread, int freezeable) { @@ -702,6 +708,7 @@ struct workqueue_struct *__create_workqueue(const char *name, if (singlethread) { cwq = init_cpu_workqueue(wq, singlethread_cpu); err = create_workqueue_thread(cwq, singlethread_cpu); + start_workqueue_thread(cwq, -1); } else { mutex_lock(&workqueue_mutex); list_add(&wq->list, &workqueues); @@ -711,6 +718,7 @@ struct workqueue_struct *__create_workqueue(const char *name, if (err || !cpu_online(cpu)) continue; err = create_workqueue_thread(cwq, cpu); + start_workqueue_thread(cwq, cpu); } mutex_unlock(&workqueue_mutex); } @@ -808,12 +816,11 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb, return NOTIFY_BAD; case CPU_ONLINE: - wake_up_process(cwq->thread); + start_workqueue_thread(cwq, cpu); break; case CPU_UP_CANCELED: - if (cwq->thread) - wake_up_process(cwq->thread); + start_workqueue_thread(cwq, -1); case CPU_DEAD: cleanup_workqueue_thread(cwq, cpu); break; |