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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2014-01-21 15:51:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-21 16:19:49 -0800
commit32665f2bbfed2e325d37236d9b0071a11a69124e (patch)
tree825cb235a94f3621478bd59792101d78e6948d81
parent354a3363363724c21ea2e4b28370e27983c2452e (diff)
mm/migrate: correct failure handling if !hugepage_migration_support()
We should remove the page from the list if we fail with ENOSYS, since migrate_pages() consider error cases except -ENOMEM and -EAGAIN as permanent failure and it assumes that the page would be removed from the list. Without this patch, we could overcount number of failure. In addition, we should put back the new hugepage if !hugepage_migration_support(). If not, we would leak hugepage memory. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Christoph Lameter <cl@linux.com> Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Rafael Aquini <aquini@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/migrate.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 626ca3c5d07b..13bedcc4656b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1013,7 +1013,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
{
int rc = 0;
int *result = NULL;
- struct page *new_hpage = get_new_page(hpage, private, &result);
+ struct page *new_hpage;
struct anon_vma *anon_vma = NULL;
/*
@@ -1023,9 +1023,12 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
* tables or check whether the hugepage is pmd-based or not before
* kicking migration.
*/
- if (!hugepage_migration_support(page_hstate(hpage)))
+ if (!hugepage_migration_support(page_hstate(hpage))) {
+ putback_active_hugepage(hpage);
return -ENOSYS;
+ }
+ new_hpage = get_new_page(hpage, private, &result);
if (!new_hpage)
return -ENOMEM;