linux-kernel - Re: [PATCH 01/14] sysctl: provide callback for write into ctl

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Date:	Sun, 29 Apr 2012 10:00:11 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	viro@...iv.linux.org.uk, fweisbec@...il.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, paulus@...ba.org, acme@...stprotocols.net,
	james.l.morris@...cle.com, akpm@...ux-foundation.org,
	tglx@...utronix.de, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 01/14] sysctl: provide callback for write into ctl_table
 entry

On Sun, 2012-04-29 at 14:07 +0200, Sasha Levin wrote:
> On Sun, Apr 29, 2012 at 10:22 AM, Eric W. Biederman

> Exactly twp of the patches (out of 14) are taking updates out of
> locks. I'm quite sure that doing that in the ftrace case is perfectly
> fine, and I'll take a second look at the sched-rt one since there
> indeed might be a race caused due to the patch that I've missed.

The update of ftrace_enable must be done under the ftrace_lock mutex.
With the exception of ftrace_kill() which is a one shot deal that kills
ftrace updates until a reboot.

-- Steve


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