mm: use IS_ENABLED(CONFIG_NUMA) instead of NUMA_BUILD

We don't need custom NUMA_BUILD anymore, since we have handy
IS_ENABLED().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/gfp.h

@@ -266,7 +266,7 @@ static inline enum zone_type gfp_zone(gfp_t flags)
 
 static inline int gfp_zonelist(gfp_t flags)
 {
-	if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
+	if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE))
 		return 1;
 
 	return 0;

include/linux/kernel.h

@@ -687,13 +687,6 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 /* 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
-
 /* This helps us avoid #ifdef CONFIG_COMPACTION */
 #ifdef CONFIG_COMPACTION
 #define COMPACTION_BUILD 1

mm/page_alloc.c

@@ -1871,7 +1871,7 @@ zonelist_scan:
 	 */
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
 						high_zoneidx, nodemask) {
-		if (NUMA_BUILD && zlc_active &&
+		if (IS_ENABLED(CONFIG_NUMA) && zlc_active &&
 			!zlc_zone_worth_trying(zonelist, z, allowednodes))
 				continue;
 		if ((alloc_flags & ALLOC_CPUSET) &&
@@ -1917,7 +1917,8 @@ zonelist_scan:
 				    classzone_idx, alloc_flags))
 				goto try_this_zone;
 
-			if (NUMA_BUILD && !did_zlc_setup && nr_online_nodes > 1) {
+			if (IS_ENABLED(CONFIG_NUMA) &&
+					!did_zlc_setup && nr_online_nodes > 1) {
 				/*
 				 * we do zlc_setup if there are multiple nodes
 				 * and before considering the first zone allowed
@@ -1936,7 +1937,7 @@ zonelist_scan:
 			 * As we may have just activated ZLC, check if the first
 			 * eligible zone has failed zone_reclaim recently.
 			 */
-			if (NUMA_BUILD && zlc_active &&
+			if (IS_ENABLED(CONFIG_NUMA) && zlc_active &&
 				!zlc_zone_worth_trying(zonelist, z, allowednodes))
 				continue;
 
@@ -1962,11 +1963,11 @@ try_this_zone:
 		if (page)
 			break;
 this_zone_full:
-		if (NUMA_BUILD)
+		if (IS_ENABLED(CONFIG_NUMA))
 			zlc_mark_zone_full(zonelist, z);
 	}
 
-	if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) {
+	if (unlikely(IS_ENABLED(CONFIG_NUMA) && page == NULL && zlc_active)) {
 		/* Disable zlc cache for second zonelist scan */
 		zlc_active = 0;
 		goto zonelist_scan;
@@ -2266,7 +2267,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
 		return NULL;
 
 	/* After successful reclaim, reconsider all zones for allocation */
-	if (NUMA_BUILD)
+	if (IS_ENABLED(CONFIG_NUMA))
 		zlc_clear_zones_full(zonelist);
 
 retry:
@@ -2412,7 +2413,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 	 * allowed per node queues are empty and that nodes are
 	 * over allocated.
 	 */
-	if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE)
+	if (IS_ENABLED(CONFIG_NUMA) &&
+			(gfp_mask & GFP_THISNODE) == GFP_THISNODE)
 		goto nopage;
 
 restart:
@@ -2819,7 +2821,7 @@ unsigned int nr_free_pagecache_pages(void)
 
 static inline void show_node(struct zone *zone)
 {
-	if (NUMA_BUILD)
+	if (IS_ENABLED(CONFIG_NUMA))
 		printk("Node %d ", zone_to_nid(zone));
 }
 

mm/vmalloc.c

@@ -2550,7 +2550,7 @@ static void s_stop(struct seq_file *m, void *p)
 
 static void show_numa_info(struct seq_file *m, struct vm_struct *v)
 {
-	if (NUMA_BUILD) {
+	if (IS_ENABLED(CONFIG_NUMA)) {
 		unsigned int nr, *counters = m->private;
 
 		if (!counters)
@@ -2615,7 +2615,7 @@ static int vmalloc_open(struct inode *inode, struct file *file)
 	unsigned int *ptr = NULL;
 	int ret;
 
-	if (NUMA_BUILD) {
+	if (IS_ENABLED(CONFIG_NUMA)) {
 		ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 		if (ptr == NULL)
 			return -ENOMEM;