aboutsummaryrefslogtreecommitdiff
path: root/include/linux/mmzone.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h16
1 files changed, 9 insertions, 7 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f5fa3082fd6..da7a829f856 100644
--- 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
/*