linux-kernel - [PATCH 1/5] sched: __sched_setscheduler: read RLIMIT

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Message-ID: <20100610230944.GA25903@redhat.com>
Date:	Fri, 11 Jun 2010 01:09:44 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] sched: __sched_setscheduler: read RLIMIT_RTPRIO
	lockless

__sched_setscheduler() takes lock_task_sighand() to access task->signal.
This is not needed since ea6d290c, ->signal can't go away.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 kernel/sched.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- 35-rc2/kernel/sched.c~1_SETSCHED_NO_SIGLOCK	2010-06-11 00:47:36.000000000 +0200
+++ 35-rc2/kernel/sched.c	2010-06-11 01:07:15.000000000 +0200
@@ -4432,12 +4432,8 @@ recheck:
 	 */
 	if (user && !capable(CAP_SYS_NICE)) {
 		if (rt_policy(policy)) {
-			unsigned long rlim_rtprio;
-
-			if (!lock_task_sighand(p, &flags))
-				return -ESRCH;
-			rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO);
-			unlock_task_sighand(p, &flags);
+			unsigned long rlim_rtprio =
+					task_rlimit(p, RLIMIT_RTPRIO);
 
 			/* can't set/change the rt policy */
 			if (policy != p->policy && !rlim_rtprio)

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