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authorAndrea Arcangeli <aarcange@redhat.com>2011-11-02 13:37:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 16:06:58 -0700
commit0693bc9ce2cc4f6a1b9c3c05790fc149a74c0b87 (patch)
treed1d04584ca8d22546fa6c375d455d04506e8162f /arch/s390
parents390: gup_huge_pmd() support THP tail recounting (diff)
downloadlinux-dev-0693bc9ce2cc4f6a1b9c3c05790fc149a74c0b87.tar.xz
linux-dev-0693bc9ce2cc4f6a1b9c3c05790fc149a74c0b87.zip
s390: gup_huge_pmd() return 0 if pte changes
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@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> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/mm/gup.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 668dda964f20..da33a0281d9d 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -93,16 +93,17 @@ static inline int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr,
*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;