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powerpc: gup_hugepte() avoid freeing the head page too many times 

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>
This commit is contained in:
Andrea Arcangeli 2011-11-02 13:37:11 -07:00 committed by Linus Torvalds
parent 405e44f2e3
commit 8596468487
1 changed files with 2 additions and 3 deletions
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5
arch/powerpc/mm/hugetlbpage.c
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@ -428,10 +428,9 @@ static noinline int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long add
if (unlikely(pte_val(pte) != pte_val(*ptep))) {
/* Could be optimized better */
while (*nr) {
*nr -= refs;
while (refs--)
put_page(head);
(*nr)--;
}
}
return 1;