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-rw-r--r--mm/memory.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 7a11ddd..2bee1f2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1871,6 +1871,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto out;
entry = pte_to_swp_entry(orig_pte);
+again:
page = lookup_swap_cache(entry);
if (!page) {
swapin_readahead(entry, address, vma);
@@ -1894,6 +1895,12 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
mark_page_accessed(page);
lock_page(page);
+ if (!PageSwapCache(page)) {
+ /* Page migration has occured */
+ unlock_page(page);
+ page_cache_release(page);
+ goto again;
+ }
/*
* Back out if somebody else already faulted in this pte.
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