[PATCH] migration: remove unnecessary PageSwapCache checks
Remove two unnecessary PageSwapCache checks. The page refcount is raised
and therefore page migration cannot occur in both functions.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/shmem.c b/mm/shmem.c
index 10020d8..84b5cf9 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1081,14 +1081,6 @@
page_cache_release(swappage);
goto repeat;
}
- if (!PageSwapCache(swappage)) {
- /* Page migration has occured */
- shmem_swp_unmap(entry);
- spin_unlock(&info->lock);
- unlock_page(swappage);
- page_cache_release(swappage);
- goto repeat;
- }
if (PageWriteback(swappage)) {
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index e5fd538..47a6812 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -716,7 +716,6 @@
*/
swap_map = &si->swap_map[i];
entry = swp_entry(type, i);
-again:
page = read_swap_cache_async(entry, NULL, 0);
if (!page) {
/*
@@ -751,12 +750,6 @@
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);
/*
