linux-kernel - Re: [RFC][PATCH] fix move/migrate

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Message-ID: <alpine.DEB.2.00.1202241105280.3726@router.home>
Date:	Fri, 24 Feb 2012 11:08:41 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH] fix move/migrate_pages() race on task struct

Oh and another thing. There are certain functions that are now called
under rcu read lock()

	security_task_movememory

and

	cpuset_mems_allowed

cpuset_mems_allowed takes a mutex. Hmmm... Under rcu?

security_task_movememory does some kind of security hook.

Is that all safe? If not then we need to take a refcount on the task
struct after all.

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