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mm: add Set,ClearPageSwapCache stubs

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If we add NOOP stubs for SetPageSwapCache() and ClearPageSwapCache(), then
we can remove the #ifdef CONFIG_SWAPs from mm/migrate.c.

Signed-off-by: Hugh Dickins <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2009-01-06 14:39:24 -08:00 • committed by Linus Torvalds
commit 6d91add09f
2 changed files with 1 additions and 4 deletions
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4
mm/migrate.c
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@ -300,12 +300,10 @@ static int migrate_page_move_mapping(struct address_space *mapping,
* Now we know that no one else is looking at the page.
*/
get_page(newpage); /* add cache reference */
#ifdef CONFIG_SWAP
if (PageSwapCache(page)) {
SetPageSwapCache(newpage);
set_page_private(newpage, page_private(page));
}
#endif
radix_tree_replace_slot(pslot, newpage);
@ -373,9 +371,7 @@ static void migrate_page_copy(struct page *newpage, struct page *page)
mlock_migrate_page(newpage, page);
#ifdef CONFIG_SWAP
ClearPageSwapCache(page);
#endif
ClearPagePrivate(page);
set_page_private(page, 0);
/* page->mapping contains a flag for PageAnon() */