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authorAndrea Arcangeli <aarcange@redhat.com>2011-11-02 13:37:11 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:43:59 -0800
commit9aa7c2a5e45e27dafa757989b307df18a8e7309b (patch)
tree65b46333ad0b73891c2d560ea644e1a668ea91fb /arch/powerpc/mm
parent80a76e1db5d707c14b0a8f519ff08d4ee4586482 (diff)
powerpc: gup_hugepte() avoid freeing the head page too many times
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>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/hugetlbpage.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index b649c288af90..78b14abded65 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -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;