include/linux/mm.h: remove unneeded ifdef

The check code for CONFIG_SWAP is redundant, because there is a
non-CONFIG_SWAP version for PageSwapCache() which just returns 0.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 4 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1202cd3121e1..52b264563cd9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -643,12 +643,9 @@ static inline struct address_space *page_mapping(struct page *page)
         struct address_space *mapping = page->mapping;
 
         VM_BUG_ON(PageSlab(page));
-#ifdef CONFIG_SWAP
         if (unlikely(PageSwapCache(page)))
                 mapping = &swapper_space;
-        else
-#endif
-        if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
+        else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
                 mapping = NULL;
         return mapping;
 }