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[PATCH] migration: remove unnecessary PageSwapCache checks

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Remove two unnecessary PageSwapCache checks.  The page refcount is raised
and therefore page migration cannot occur in both functions.

Signed-off-by: Christoph Lameter <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2006-06-23 02:03:08 -07:00 • committed by Linus Torvalds
commit 3c5a87f476
2 changed files with 0 additions and 15 deletions
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7
mm/swapfile.c
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@ -716,7 +716,6 @@ 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) {
/*
@ -751,12 +750,6 @@ again:
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);
/*