[PATCH] reduce MAX_NR_ZONES: page allocator ZONE_HIGHMEM cleanup

page allocator ZONE_HIGHMEM fixups

1. We do not need to do an #ifdef in si_meminfo since both counters
   in use are zero if !CONFIG_HIGHMEM.

2. Add #ifdef in si_meminfo_node instead to avoid referencing zone
   information for ZONE_HIGHMEM if we do not have HIGHMEM
   (may not be there after the following patches).

3. Replace the use of ZONE_HIGHMEM with MAX_NR_ZONES in build_zonelists_node

4. build_zonelists_node: Remove BUG_ON for ZONE_HIGHMEM. Zone will
   be optional soon and thus BUG_ON cannot be triggered anymore.

5. init_free_area_core: Replace a use of ZONE_HIGHMEM with NR_MAX_ZONES.

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

1 files changed, 7 insertions, 10 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5cde54695cf..13c102b95c5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1199,13 +1199,8 @@ void si_meminfo(struct sysinfo *val)
         val->sharedram = 0;
         val->freeram = nr_free_pages();
         val->bufferram = nr_blockdev_pages();
-#ifdef CONFIG_HIGHMEM
         val->totalhigh = totalhigh_pages;
         val->freehigh = nr_free_highpages();
-#else
-        val->totalhigh = 0;
-        val->freehigh = 0;
-#endif
         val->mem_unit = PAGE_SIZE;
 }
 
@@ -1218,8 +1213,13 @@ void si_meminfo_node(struct sysinfo *val, int nid)
 
         val->totalram = pgdat->node_present_pages;
         val->freeram = nr_free_pages_pgdat(pgdat);
+#ifdef CONFIG_HIGHMEM
         val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;
         val->freehigh = pgdat->node_zones[ZONE_HIGHMEM].free_pages;
+#else
+        val->totalhigh = 0;
+        val->freehigh = 0;
+#endif
         val->mem_unit = PAGE_SIZE;
 }
 #endif
@@ -1344,14 +1344,11 @@ static int __meminit build_zonelists_node(pg_data_t *pgdat,
 {
         struct zone *zone;
 
-        BUG_ON(zone_type > ZONE_HIGHMEM);
+        BUG_ON(zone_type >= MAX_NR_ZONES);
 
         do {
                 zone = pgdat->node_zones + zone_type;
                 if (populated_zone(zone)) {
-#ifndef CONFIG_HIGHMEM
-                        BUG_ON(zone_type > ZONE_NORMAL);
-#endif
                         zonelist->zones[nr_zones++] = zone;
                         check_highest_zone(zone_type);
                 }
@@ -1981,7 +1978,7 @@ static void __meminit free_area_init_core(struct pglist_data *pgdat,
                 if (zholes_size)
                         realsize -= zholes_size[j];
 
-                if (j < ZONE_HIGHMEM)
+                if (!is_highmem_idx(j))
                         nr_kernel_pages += realsize;
                 nr_all_pages += realsize;