From d44d363f65780f2ac2ec672164555af54896d40d Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Wed, 3 May 2017 14:52:26 -0700 Subject: mm: don't assume anonymous pages have SwapBacked flag There are a few places the code assumes anonymous pages should have SwapBacked flag set. MADV_FREE pages are anonymous pages but we are going to add them to LRU_INACTIVE_FILE list and clear SwapBacked flag for them. The assumption doesn't hold any more, so fix them. Link: http://lkml.kernel.org/r/3945232c0df3dd6c4ef001976f35a95f18dcb407.1487965799.git.shli@fb.com Signed-off-by: Shaohua Li Acked-by: Johannes Weiner Acked-by: Hillf Danton Cc: Michal Hocko Cc: Minchan Kim Cc: Hugh Dickins Cc: Rik van Riel Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/migrate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm/migrate.c') diff --git a/mm/migrate.c b/mm/migrate.c index 5c5df09ac962..b32630d10329 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1944,7 +1944,8 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, /* Prepare a page as a migration target */ __SetPageLocked(new_page); - __SetPageSwapBacked(new_page); + if (PageSwapBacked(page)) + __SetPageSwapBacked(new_page); /* anon mapping, we can simply copy page->mapping to the new page: */ new_page->mapping = page->mapping; -- cgit v1.2.3