From cbd9b67bd3883dff0ef4b8ec9229d315a9ba38f0 Mon Sep 17 00:00:00 2001
From: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Date: Tue, 29 Apr 2008 00:59:23 -0700
Subject: [PATCH] kthread: call wake_up_process() without the lock being held
From the POV of synchronization, there should be no need to call
wake_up_process() with the 'kthread_create_lock' being held.
Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/kthread.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 92cf6930ab51a..ac72eea48339c 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -144,9 +144,9 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
spin_lock(&kthread_create_lock);
list_add_tail(&create.list, &kthread_create_list);
- wake_up_process(kthreadd_task);
spin_unlock(&kthread_create_lock);
+ wake_up_process(kthreadd_task);
wait_for_completion(&create.done);
if (!IS_ERR(create.result)) {
--
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