Date: Wed, 17 Oct 2012 14:14:13 -0400
From: Dave Jones <davej@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        KOSAKI Motohiro <kosaki.motohiro@gmail.com>, bhutchings@solarflare.com,
        Konstantin Khlebnikov <khlebnikov@openvz.org>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Hugh Dickins <hughd@google.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch for-3.7] mm, mempolicy: fix printing stack contents in
 numa_maps
Message-ID: <20121017181413.GA16805@redhat.com>
Mail-Followup-To: Dave Jones <davej@redhat.com>,
	David Rientjes <rientjes@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
	bhutchings@solarflare.com,
	Konstantin Khlebnikov <khlebnikov@openvz.org>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
	Hugh Dickins <hughd@google.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
References: <20121008150949.GA15130@redhat.com>
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On Tue, Oct 16, 2012 at 10:24:32PM -0700, David Rientjes wrote:
 > On Wed, 17 Oct 2012, Dave Jones wrote:
 > 
 > > BUG: sleeping function called from invalid context at kernel/mutex.c:269
 > 
 > Hmm, looks like we need to change the refcount semantics entirely.  We'll 
 > need to make get_vma_policy() always take a reference and then drop it 
 > accordingly.  This work sif get_vma_policy() can grab a reference while 
 > holding task_lock() for the task policy fallback case.
 > 
 > Comments on this approach?

Seems to be surviving my testing at least..

	Dave

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