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    Subject[186/262] powerpc: gup_hugepte() avoid freeing the head page too many times
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Andrea Arcangeli <aarcange@redhat.com>

    commit 8596468487e2062cae2aad56e973784e03959245 upstream.

    We only taken "refs" pins on the head page not "*nr" pins.

    Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Johannes Weiner <jweiner@redhat.com>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Acked-by: David Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    arch/powerpc/mm/hugetlbpage.c | 5 ++---
    1 file changed, 2 insertions(+), 3 deletions(-)

    --- a/arch/powerpc/mm/hugetlbpage.c
    +++ b/arch/powerpc/mm/hugetlbpage.c
    @@ -428,10 +428,9 @@ static noinline int gup_hugepte(pte_t *p

    if (unlikely(pte_val(pte) != pte_val(*ptep))) {
    /* Could be optimized better */
    - while (*nr) {
    + *nr -= refs;
    + while (refs--)
    put_page(head);
    - (*nr)--;
    - }
    }

    return 1;



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