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-rw-r--r--mm/swapfile.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index f1e69c3..9678182 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -646,6 +646,7 @@ static int try_to_unuse(unsigned int type)
*/
swap_map = &si->swap_map[i];
entry = swp_entry(type, i);
+again:
page = read_swap_cache_async(entry, NULL, 0);
if (!page) {
/*
@@ -680,6 +681,12 @@ static int try_to_unuse(unsigned int type)
wait_on_page_locked(page);
wait_on_page_writeback(page);
lock_page(page);
+ if (!PageSwapCache(page)) {
+ /* Page migration has occured */
+ unlock_page(page);
+ page_cache_release(page);
+ goto again;
+ }
wait_on_page_writeback(page);
/*