[PATCH] make add_to_swap_cache() static

From: Hugh Dickins <hugh@veritas.com>

Make add_to_swap_cache static, it's only used by read_swap_cache_async;
and since that has just done a GFP_HIGHUSER allocation, surely it's
better for add_to_swap_cache to use GFP_KERNEL than GFP_ATOMIC.

include/linux/swap.h

@@ -200,7 +200,6 @@ extern int rw_swap_page_sync(int, swp_entry_t, struct page *);
 extern struct address_space swapper_space;
 #define total_swapcache_pages  swapper_space.nrpages
 extern void show_swap_cache_info(void);
-extern int add_to_swap_cache(struct page *, swp_entry_t);
 extern int add_to_swap(struct page *);
 extern void __delete_from_swap_cache(struct page *);
 extern void delete_from_swap_cache(struct page *);

mm/swap_state.c

@@ -68,7 +68,7 @@ void show_swap_cache_info(void)
 		swap_cache_info.noent_race, swap_cache_info.exist_race);
 }
 
-int add_to_swap_cache(struct page *page, swp_entry_t entry)
+static int add_to_swap_cache(struct page *page, swp_entry_t entry)
 {
 	int error;
 
@@ -78,7 +78,7 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry)
 		INC_CACHE_INFO(noent_race);
 		return -ENOENT;
 	}
-	error = add_to_page_cache(page, &swapper_space, entry.val, GFP_ATOMIC);
+	error = add_to_page_cache(page, &swapper_space, entry.val, GFP_KERNEL);
 	/*
 	 * Anon pages are already on the LRU, we don't run lru_cache_add here.
 	 */