[PATCH 4/6] de_thread: don't take tasklist_lock

[Oleg Nesterov]

de_thread() takes tasklist_lock for zap_other_threads(),
this is unneeded now.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- 2.6.16-rc3/fs/exec.c~4_DET	2006-02-18 01:12:36.000000000 +0300
+++ 2.6.16-rc3/fs/exec.c	2006-02-23 01:59:12.000000000 +0300
@@ -604,7 +604,6 @@ static int de_thread(struct task_struct 
 	 * Kill all other threads in the thread group.
 	 * We must hold tasklist_lock to call zap_other_threads.
 	 */
-	read_lock(&tasklist_lock);
 	spin_lock_irq(lock);
 	if (sig->flags & SIGNAL_GROUP_EXIT) {
 		/*
@@ -612,12 +611,10 @@ static int de_thread(struct task_struct 
 		 * return so that the signal is processed.
 		 */
 		spin_unlock_irq(lock);
-		read_unlock(&tasklist_lock);
 		kmem_cache_free(sighand_cachep, newsighand);
 		return -EAGAIN;
 	}
 	zap_other_threads(current);
-	read_unlock(&tasklist_lock);
 
 	/*
 	 * Account for the thread group leader hanging around:
-
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