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Message-Id: <20111109213200.747474723@clark.kroah.org>
Date: Wed, 09 Nov 2011 13:33:51 -0800
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
alan@...rguk.ukuu.org.uk, Andrea Arcangeli <aarcange@...hat.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Hugh Dickins <hughd@...gle.com>,
Johannes Weiner <jweiner@...hat.com>,
Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
David Gibson <david@...son.dropbear.id.au>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
David Miller <davem@...emloft.net>
Subject: [184/264] s390: gup_huge_pmd() return 0 if pte changes
3.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andrea Arcangeli <aarcange@...hat.com>
commit 0693bc9ce2cc4f6a1b9c3c05790fc149a74c0b87 upstream.
s390 didn't return 0 in that case, if it's rolling back the *nr pointer it
should also return zero to avoid adding pages to the array at the wrong
offset.
Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Johannes Weiner <jweiner@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: David Gibson <david@...son.dropbear.id.au>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: David Miller <davem@...emloft.net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
arch/s390/mm/gup.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -93,16 +93,17 @@ static inline int gup_huge_pmd(pmd_t *pm
*nr -= refs;
while (refs--)
put_page(head);
- } else {
- /*
- * Any tail page need their mapcount reference taken
- * before we return.
- */
- while (refs--) {
- if (PageTail(tail))
- get_huge_page_tail(tail);
- tail++;
- }
+ return 0;
+ }
+
+ /*
+ * Any tail page need their mapcount reference taken before we
+ * return.
+ */
+ while (refs--) {
+ if (PageTail(tail))
+ get_huge_page_tail(tail);
+ tail++;
}
return 1;
--
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