From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Sat, 24 Mar 2012 12:48:23 +0000
Subject: Re: [PATCH 07/10] um: Should hold tasklist_lock while traversing processes
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List-Id: <linux-sh.vger.kernel.org>
References: <20120324102609.GA28356@lizard> <20120324103030.GG29067@lizard>
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To: linux-arm-kernel@lists.infradead.org

On Sat, 2012-03-24 at 14:30 +0400, Anton Vorontsov wrote:
> Traversing the tasks requires holding tasklist_lock, otherwise it
> is unsafe. 

No it doesn't, it either requires tasklist_lock or rcu_read_lock().