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[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>
This commit is contained in:
Christoph Lameter 2006-06-23 02:03:08 -07:00 committed by Linus Torvalds
parent 4776874ff0
commit 3c5a87f476
2 changed files with 0 additions and 15 deletions
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8
mm/shmem.c
View File

@ -1081,14 +1081,6 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
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);

7
mm/swapfile.c
View File

@ -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 @@ 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);
/*