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authorNicholas Piggin <npiggin@gmail.com>2016-12-25 06:00:29 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-25 22:54:48 +0300
commit6326fec1122cde256bd2a8c63f2606e08e44ce1d (patch)
tree5e5bc0e4c71903bbdc6477f4868d35f970743e21 /mm
parent7c0f6ba682b9c7632072ffbedf8d328c8f3c42ba (diff)
downloadlinux-6326fec1122cde256bd2a8c63f2606e08e44ce1d.tar.xz
mm: Use owner_priv bit for PageSwapCache, valid when PageSwapBacked
A page is not added to the swap cache without being swap backed, so PageSwapBacked mappings can use PG_owner_priv_1 for PageSwapCache. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Bob Peterson <rpeterso@redhat.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Andrew Lutomirski <luto@kernel.org> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory-failure.c4
-rw-r--r--mm/migrate.c14
2 files changed, 9 insertions, 9 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 19e796d36a62..f283c7e0a2a3 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -764,12 +764,11 @@ static int me_huge_page(struct page *p, unsigned long pfn)
*/
#define dirty (1UL << PG_dirty)
-#define sc (1UL << PG_swapcache)
+#define sc ((1UL << PG_swapcache) | (1UL << PG_swapbacked))
#define unevict (1UL << PG_unevictable)
#define mlock (1UL << PG_mlocked)
#define writeback (1UL << PG_writeback)
#define lru (1UL << PG_lru)
-#define swapbacked (1UL << PG_swapbacked)
#define head (1UL << PG_head)
#define slab (1UL << PG_slab)
#define reserved (1UL << PG_reserved)
@@ -819,7 +818,6 @@ static struct page_state {
#undef mlock
#undef writeback
#undef lru
-#undef swapbacked
#undef head
#undef slab
#undef reserved
diff --git a/mm/migrate.c b/mm/migrate.c
index 0ed24b1fa77b..87f4d0f81819 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -466,13 +466,15 @@ int migrate_page_move_mapping(struct address_space *mapping,
*/
newpage->index = page->index;
newpage->mapping = page->mapping;
- if (PageSwapBacked(page))
- __SetPageSwapBacked(newpage);
-
get_page(newpage); /* add cache reference */
- if (PageSwapCache(page)) {
- SetPageSwapCache(newpage);
- set_page_private(newpage, page_private(page));
+ if (PageSwapBacked(page)) {
+ __SetPageSwapBacked(newpage);
+ if (PageSwapCache(page)) {
+ SetPageSwapCache(newpage);
+ set_page_private(newpage, page_private(page));
+ }
+ } else {
+ VM_BUG_ON_PAGE(PageSwapCache(page), page);
}
/* Move dirty while page refs frozen and newpage not yet exposed */