From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 29 Mar 2006 00:11:23 +0000 (-0800)
Subject: [PATCH] do_group_exit: don't take tasklist_lock
X-Git-Tag: v2.6.17-rc1~176
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=aacc90944d4b1f2fcec73a8127eb60a3a701ce1c;p=~shefty%2Frdma-dev.git

[PATCH] do_group_exit: don't take tasklist_lock

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

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/exit.c b/kernel/exit.c
index 44d6c6e3896..aea23e713cf 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -985,7 +985,6 @@ 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.  */
@@ -995,7 +994,6 @@ do_group_exit(int exit_code)
 			zap_other_threads(current);
 		}
 		spin_unlock_irq(&sighand->siglock);
-		read_unlock(&tasklist_lock);
 	}
 
 	do_exit(exit_code);