[PATCH] reduce MAX_NR_ZONES: make ZONE_HIGHMEM optional

Make ZONE_HIGHMEM optional

- ifdef out code and definitions related to CONFIG_HIGHMEM

- __GFP_HIGHMEM falls back to normal allocations if there is no
  ZONE_HIGHMEM

- GFP_ZONEMASK becomes 0x01 if there is no DMA32 and no HIGHMEM
  zone.

[jdike@addtoit.com: build fix]
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5b5cbb5e1816..6c7c2dd1b3ed 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -73,7 +73,9 @@ int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = {
 #ifdef CONFIG_ZONE_DMA32
          256,
 #endif
+#ifdef CONFIG_HIGHMEM
          32
+#endif
 };
 
 EXPORT_SYMBOL(totalram_pages);
@@ -91,7 +93,9 @@ static char *zone_names[MAX_NR_ZONES] = {
          "DMA32",
 #endif
          "Normal",
+#ifdef CONFIG_HIGHMEM
          "HighMem"
+#endif
 };
 
 int min_free_kbytes = 1024;
@@ -1375,8 +1379,10 @@ static int __meminit build_zonelists_node(pg_data_t *pgdat,
 static inline int highest_zone(int zone_bits)
 {
         int res = ZONE_NORMAL;
+#ifdef CONFIG_HIGHMEM
         if (zone_bits & (__force int)__GFP_HIGHMEM)
                 res = ZONE_HIGHMEM;
+#endif
 #ifdef CONFIG_ZONE_DMA32
         if (zone_bits & (__force int)__GFP_DMA32)
                 res = ZONE_DMA32;