linux-kernel - [PATCH -mm 1/2] send_sigqueue: don't take rcu lock

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Message-ID: <20080305215313.GA3818@tv-sign.ru>
Date:	Thu, 6 Mar 2008 00:53:13 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Pavel Emelyanov <xemul@...nvz.org>,
	Roland McGrath <roland@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH -mm 1/2] send_sigqueue: don't take rcu lock

(depends on lock_task_sighand-add-rcu-lock-unlock.patch)

lock_task_sighand() was changed, send_sigqueue() doesn't need rcu_read_lock()
any longer.

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

--- 25/kernel/signal.c~1_SS_NO_RCU	2008-03-06 00:31:08.000000000 +0300
+++ 25/kernel/signal.c	2008-03-06 00:35:35.000000000 +0300
@@ -1311,8 +1311,6 @@ int send_sigqueue(int sig, struct sigque
 	 * We return -1, when the task is marked exiting, so
 	 * posix_timer_event can redirect it to the group leader
 	 */
-	rcu_read_lock();
-
 	if (!likely(lock_task_sighand(p, &flags)))
 		goto out_err;
 
@@ -1323,8 +1321,6 @@ int send_sigqueue(int sig, struct sigque
 
 	unlock_task_sighand(p, &flags);
 out_err:
-	rcu_read_unlock();
-
 	return ret;
 }
 

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