linux-kernel - Re: [PATCH 1/2] trace_events_filter: use rcu_assign_pointer() when setting ftrace_event

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Message-ID: <1322068000.20742.61.camel@frodo>
Date:	Wed, 23 Nov 2011 12:06:40 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] trace_events_filter: use rcu_assign_pointer() when
 setting ftrace_event_call->filter

On Wed, 2011-11-23 at 08:06 -0800, Tejun Heo wrote:

> So, synchronized_sched() being called after isn't relevant.  We want
> smp_wmb() between data structure initialization and assignment of the
> new pointer.

Ah, you're saying that we need to guarantee that the allocated filter is
seen before we update the call->filter to point to it. OK, fair enough,
this does look like a bug fix.

Is it big enough to be considered for stable?

-- Steve


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