linux-kernel - Re: [PATCH] pagemap: remove remaining unneeded spin

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Message-ID: <20120329202628.GD20930@redhat.com>
Date:	Thu, 29 Mar 2012 22:26:28 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, stable@...r.kernel.org
Subject: Re: [PATCH] pagemap: remove remaining unneeded spin_lock()

On Thu, Mar 29, 2012 at 04:39:39AM -0400, Naoya Horiguchi wrote:
> commit: 025c5b2451e4 "thp: optimize away unnecessary page table locking"
> moves spin_lock() into pmd_trans_huge_lock() in order to avoid locking
> unless pmd is for thp. So this spin_lock() is a bug.
> 
> Reported-by: Sasha Levin <levinsasha928@...il.com>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: stable@...r.kernel.org

Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>
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