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mm: migrate: hugetlb: putback destination hugepage to active list

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Since commit bcc5422230 ("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 bcc5422230 in this special
case, so this patch fixes it.

Fixes: bcc5422230 ("mm: hugetlb: introduce page_huge_active")
Signed-off-by: Naoya Horiguchi <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: <[email protected]>  [4.1.x]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Naoya Horiguchi 2015-09-22 14:59:14 -07:00 • committed by Linus Torvalds
commit 3aaa76e125
1 changed files with 1 additions and 1 deletions
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2
mm/migrate.c
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@ -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)