mm: only build per-node scan_unevictable functions when NUMA is enabled
Non-NUMA systems do never create these files anyway, since they are only
created by driver subsystem when NUMA is configured.
[akpm@linux-foundation.org: cleanup]
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 7cdd633..eba53e7 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -271,8 +271,18 @@
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 6cbc1aa..f5871ee 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2986,6 +2986,7 @@
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.
@@ -3032,4 +3033,4 @@
{
sysdev_remove_file(&node->sysdev, &attr_scan_unevictable_pages);
}
-
+#endif