From 60371d971a3d01afd102f0bbf2681f32ecc31d78 Mon Sep 17 00:00:00 2001
From: Hugh Dickins
Date: Tue, 6 Jan 2009 14:39:40 -0800
Subject: mm: add add_to_swap stub

If we add a failing stub for add_to_swap(), then we can remove the #ifdef
CONFIG_SWAP from mm/vmscan.c.

This was intended as a source cleanup, but looking more closely, it turns
out that the !CONFIG_SWAP case was going to keep_locked for an anonymous
page, whereas now it goes to the more suitable activate_locked, like the
CONFIG_SWAP nr_swap_pages 0 case.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Robin Holt <holt@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/swap.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'include/linux/swap.h')

diff --git a/include/linux/swap.h b/include/linux/swap.h
index c38bd157695b..c0d23ac710d5 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -371,6 +371,11 @@ static inline struct page *lookup_swap_cache(swp_entry_t swp)
 	return NULL;
 }
 
+static inline int add_to_swap(struct page *page)
+{
+	return 0;
+}
+
 static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
 							gfp_t gfp_mask)
 {
-- 
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