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Date: Wed, 17 Oct 2012 14:27:35 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
Subject: Re: [patch for-3.7] mm, mempolicy: fix printing stack contents in
 numa_maps
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To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Dave Jones <davej@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, bhutchings@solarflare.com, Konstantin Khlebnikov <khlebnikov@openvz.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Hugh Dickins <hughd@google.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org

On Wed, 17 Oct 2012, KOSAKI Motohiro wrote:

> > Um, this was just changed to a mutex last week in commit b22d127a39dd
> > ("mempolicy: fix a race in shared_policy_replace()") so that sp_alloc()
> > can be done with GFP_KERNEL, so I didn't consider reverting that behavior.
> > Are you nacking that patch, which you acked, now?
> 
> Yes, sadly. /proc usage is a corner case issue. It's not worth to
> strike main path.

It also simplifies the fastpath since we can now unconditionally drop the 
reference.

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