Messages in this thread Patch in this message | | | From | Joonsoo Kim <> | Subject | [PATCH 4/4] swap: clean-up #ifdef in page_mapping() | Date | Fri, 2 Aug 2013 11:07:59 +0900 |
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PageSwapCache() is always false when !CONFIG_SWAP, so compiler properly discard related code. Therefore, we don't need #ifdef explicitly.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
diff --git a/include/linux/swap.h b/include/linux/swap.h index d95cde5..c638a71 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -414,6 +414,7 @@ mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout) #else /* CONFIG_SWAP */ +#define swap_address_space(entry) (NULL) #define get_nr_swap_pages() 0L #define total_swap_pages 0L #define total_swapcache_pages() 0UL diff --git a/mm/util.c b/mm/util.c index 7441c41..eaf63fc2 100644 --- a/mm/util.c +++ b/mm/util.c @@ -388,15 +388,12 @@ 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))) { swp_entry_t entry; entry.val = page_private(page); mapping = swap_address_space(entry); - } else -#endif - if ((unsigned long)mapping & PAGE_MAPPING_ANON) + } else if ((unsigned long)mapping & PAGE_MAPPING_ANON) mapping = NULL; return mapping; } -- 1.7.9.5
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