[PATCH] Add NUMA_BUILD definition in kernel.h to avoid #ifdef CONFIG_NUMA

The NUMA_BUILD constant is always available and will be set to 1 on
NUMA_BUILDs.  That way checks valid only under CONFIG_NUMA can easily be done
without #ifdef CONFIG_NUMA

F.e.

if (NUMA_BUILD && <numa_condition>) {
...
}

[akpm: not a thing we'd normally do, but CONFIG_NUMA is special: it is
 causing ifdef explosion in core kernel, so let's see if this is a comfortable
 way in whcih to control that]

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 12 insertions, 7 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4fa373bb18ac..4d00988dad03 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -350,4 +350,11 @@ struct sysinfo {
 /* Trap pasters of __FUNCTION__ at compile-time */
 #define __FUNCTION__ (__func__)
 
+/* This helps us to avoid #ifdef CONFIG_NUMA */
+#ifdef CONFIG_NUMA
+#define NUMA_BUILD 1
+#else
+#define NUMA_BUILD 0
+#endif
+
 #endif
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8a6418b0d2c5..4c76188b1681 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -942,7 +942,7 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
          */
         do {
                 zone = *z;
-                if (unlikely((gfp_mask & __GFP_THISNODE) &&
+                if (unlikely(NUMA_BUILD && (gfp_mask & __GFP_THISNODE) &&
                         zone->zone_pgdat != zonelist->zones[0]->zone_pgdat))
                                 break;
                 if ((alloc_flags & ALLOC_CPUSET) &&
@@ -1256,14 +1256,12 @@ unsigned int nr_free_pagecache_pages(void)
 {
         return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER));
 }
-#ifdef CONFIG_NUMA
-static void show_node(struct zone *zone)
+
+static inline void show_node(struct zone *zone)
 {
-        printk("Node %ld ", zone_to_nid(zone));
+        if (NUMA_BUILD)
+                printk("Node %ld ", zone_to_nid(zone));
 }
-#else
-#define show_node(zone) do { } while (0)
-#endif
 
 void si_meminfo(struct sysinfo *val)
 {