[PATCH] mm: only build per-node scan_unevictable when NUMA is enabled

[Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>]

Non-NUMA systems do never create these files anyway, since they are only
created by driver subsystem when NUMA is configured.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
---
 include/linux/swap.h |    5 +++++
 mm/vmscan.c          |    3 ++-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index ff4acea..3c0876d 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -271,8 +271,13 @@ extern void scan_mapping_unevictable_pages(struct address_space *);
 extern unsigned long scan_unevictable_pages;
 extern int scan_unevictable_handler(struct ctl_table *, int,
 					void __user *, size_t *, loff_t *);
+#ifdef CONFIG_NUMA
 extern int scan_unevictable_register_node(struct node *node);
 extern void scan_unevictable_unregister_node(struct node *node);
+#else
+static inline int scan_unevictable_register_node(struct node *node) {return 0;}
+static inline void scan_unevictable_unregister_node(struct node *node) {}
+#endif
 
 extern int kswapd_run(int nid);
 extern void kswapd_stop(int nid);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b94fe1b..ba8f6fd 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2898,6 +2898,7 @@ int scan_unevictable_handler(struct ctl_table *table, int write,
 	return 0;
 }
 
+#ifdef CONFIG_NUMA
 /*
  * per node 'scan_unevictable_pages' attribute.  On demand re-scan of
  * a specified node's per zone unevictable lists for evictable pages.
@@ -2944,4 +2945,4 @@ void scan_unevictable_unregister_node(struct node *node)
 {
 	sysdev_remove_file(&node->sysdev, &attr_scan_unevictable_pages);
 }
-
+#endif
-- 
1.7.1

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