[PATCH] x86_64: Add 4GB DMA32 zone

[safe/jmp/linux-2.6] / include / linux / mmzone.h

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f5fa308..da7a829 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -71,10 +71,11 @@ struct per_cpu_pageset {
 #endif
 
 #define ZONE_DMA               0
-#define ZONE_NORMAL            1
-#define ZONE_HIGHMEM           2
+#define ZONE_DMA32             1
+#define ZONE_NORMAL            2
+#define ZONE_HIGHMEM           3
 
-#define MAX_NR_ZONES           3       /* Sync this with ZONES_SHIFT */
+#define MAX_NR_ZONES           4       /* Sync this with ZONES_SHIFT */
 #define ZONES_SHIFT            2       /* ceil(log2(MAX_NR_ZONES)) */
 
 
@@ -108,9 +109,10 @@ struct per_cpu_pageset {
 
 /*
  * On machines where it is needed (eg PCs) we divide physical memory
- * into multiple physical zones. On a PC we have 3 zones:
+ * into multiple physical zones. On a PC we have 4 zones:
  *
  * ZONE_DMA      < 16 MB       ISA DMA capable memory
+ * ZONE_DMA32       0 MB       Empty
  * ZONE_NORMAL 16-896 MB       direct mapped by the kernel
  * ZONE_HIGHMEM         > 896 MB       only page cache and user processes
  */
@@ -455,10 +457,10 @@ extern struct pglist_data contig_page_data;
 
 #if BITS_PER_LONG == 32 || defined(ARCH_HAS_ATOMIC_UNSIGNED)
 /*
- * with 32 bit page->flags field, we reserve 8 bits for node/zone info.
- * there are 3 zones (2 bits) and this leaves 8-2=6 bits for nodes.
+ * with 32 bit page->flags field, we reserve 9 bits for node/zone info.
+ * there are 4 zones (3 bits) and this leaves 9-3=6 bits for nodes.
  */
-#define FLAGS_RESERVED         8
+#define FLAGS_RESERVED         9
 
 #elif BITS_PER_LONG == 64
 /*