From: Gerald Schaefer <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 97534127012f0e396eddea4691f4c9b170aed74b upstream.
Commit 61f77eda9bbf ("mm/hugetlb: reduce arch dependent code around
follow_huge_*") broke follow_huge_pmd() on s390, where pmd and pte
layout differ and using pte_page() on a huge pmd will return wrong
results. Using pmd_page() instead fixes this.
All architectures that were touched by that commit have pmd_page()
defined, so this should not break anything on other architectures.
Fixes: 61f77eda "mm/hugetlb: reduce arch dependent code around follow_huge_*"
Signed-off-by: Gerald Schaefer <[email protected]>
Acked-by: Naoya Horiguchi <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Michal Hocko <[email protected]>, Andrea Arcangeli <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
mm/hugetlb.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 424ee30fcd0d..c91c347bb3ea 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3494,8 +3494,7 @@ retry:
if (!pmd_huge(*pmd))
goto out;
if (pmd_present(*pmd)) {
- page = pte_page(*(pte_t *)pmd) +
- ((address & ~PMD_MASK) >> PAGE_SHIFT);
+ page = pmd_page(*pmd) + ((address & ~PMD_MASK) >> PAGE_SHIFT);
if (flags & FOLL_GET)
get_page(page);
} else {
--
2.3.7
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