[PATCH 5/6] do_group_exit: don't take tasklist_lock

[Oleg Nesterov <oleg@tv-sign.ru>]

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

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- 2.6.16-rc3/kernel/exit.c~5_DGE	2006-02-23 01:00:35.000000000 +0300
+++ 2.6.16-rc3/kernel/exit.c	2006-02-23 02:01:03.000000000 +0300
@@ -971,7 +971,6 @@ do_group_exit(int exit_code)
 	else if (!thread_group_empty(current)) {
 		struct signal_struct *const sig = current->signal;
 		struct sighand_struct *const sighand = current->sighand;
-		read_lock(&tasklist_lock);
 		spin_lock_irq(&sighand->siglock);
 		if (sig->flags & SIGNAL_GROUP_EXIT)
 			/* Another thread got here before we took the lock.  */
@@ -981,7 +980,6 @@ do_group_exit(int exit_code)
 			zap_other_threads(current);
 		}
 		spin_unlock_irq(&sighand->siglock);
-		read_unlock(&tasklist_lock);
 	}
 
 	do_exit(exit_code);
-
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