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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2015-09-22 14:59:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-22 15:09:53 -0700
commit3aaa76e125c1dd58c9b599baa8c6021896874c12 (patch)
treed733e970440cbe96dc3fe78cbaf56b1581eb036b /mm/migrate.c
parent8a04446ab0cf4f35d9f583cd6adcbf7c534e4995 (diff)
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mm: migrate: hugetlb: putback destination hugepage to active list
Since commit bcc54222309c ("mm: hugetlb: introduce page_huge_active") each hugetlb page maintains its active flag to avoid a race condition betwe= en multiple calls of isolate_huge_page(), but current kernel doesn't set the f= lag on a hugepage allocated by migration because the proper putback routine isn= 't called. This means that users could still encounter the race referred to by bcc54222309c in this special case, so this patch fixes it. Fixes: bcc54222309c ("mm: hugetlb: introduce page_huge_active") Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Andi Kleen <andi@firstfloor.org> Cc: Hugh Dickins <hughd@google.com> Cc: <stable@vger.kernel.org> [4.1.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index c3cb566af3e2..7452a00bbb50 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1075,7 +1075,7 @@ out:
if (rc != MIGRATEPAGE_SUCCESS && put_new_page)
put_new_page(new_hpage, private);
else
- put_page(new_hpage);
+ putback_active_hugepage(new_hpage);
if (result) {
if (rc)