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    SubjectRe: [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@gmail.com>
    > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    > Cc: stable@vger.kernel.org

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


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