mm: postpone migrated page mapping reset
Postpone resetting page->mapping until the final remove_migration_ptes().
Otherwise the expression PageAnon(migration_entry_to_page(entry)) does not
work.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/migrate.c b/mm/migrate.c
index 9871a56..df141f6 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -445,7 +445,6 @@
ClearPageSwapCache(page);
ClearPagePrivate(page);
set_page_private(page, 0);
- page->mapping = NULL;
/*
* If any waiters have accumulated on the new page then
@@ -667,6 +666,7 @@
} else {
if (remap_swapcache)
remove_migration_ptes(page, newpage);
+ page->mapping = NULL;
}
unlock_page(newpage);