Optional DMA zone: Replace uses of ZONE_DMA as the first zone
In two places in the VM we use ZONE_DMA to refer to the first zone.
If ZONE_DMA is optional then other zones may be first. So simply
replace ZONE_DMA with zone 0.
This also fixes ZONETABLE_PGSHIFT. If we have only a single zone then
ZONES_PGSHIFT may become 0 because there is no need anymore to encode the
zone number related to a pgdat. However, we still need a zonetable to index
all the zones for each node if this is a NUMA system. Therefore define
ZONETABLE_SHIFT unconditionally as the offset of the ZONE field in page flags.
Acked-by: Christoph Hellwig <[EMAIL PROTECTED]>
Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]>
Index: linux-2.6.18-rc6-mm2/mm/mempolicy.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/mm/mempolicy.c 2006-09-18 13:07:53.318935179
-0500
+++ linux-2.6.18-rc6-mm2/mm/mempolicy.c 2006-09-18 13:16:18.929008279 -0500
@@ -105,7 +105,7 @@ static struct kmem_cache *sn_cache;
/* Highest zone. An specific allocation for a zone below that is not
policied. */
-enum zone_type policy_zone = ZONE_DMA;
+enum zone_type policy_zone = 0;
struct mempolicy default_policy = {
.refcnt = ATOMIC_INIT(1), /* never free it */
Index: linux-2.6.18-rc6-mm2/mm/page_alloc.c
===================================================================
--- linux-2.6.18-rc6-mm2.orig/mm/page_alloc.c 2006-09-18 13:16:14.463795639
-0500
+++ linux-2.6.18-rc6-mm2/mm/page_alloc.c 2006-09-18 13:27:53.271625765
-0500
@@ -2486,11 +2486,11 @@ static void __meminit free_area_init_cor
" %s zone: %lu pages exceeds realsize %lu\n",
zone_names[j], memmap_pages, realsize);
- /* Account for reserved DMA pages */
- if (j == ZONE_DMA && realsize > dma_reserve) {
+ /* Account for reserved pages */
+ if (j == 0 && realsize > dma_reserve) {
realsize -= dma_reserve;
- printk(KERN_DEBUG " DMA zone: %lu pages reserved\n",
- dma_reserve);
+ printk(KERN_DEBUG " %s zone: %lu pages reserved\n",
+ zone_names[0], dma_reserve);
}
if (!is_highmem_idx(j))
Index: linux-2.6.18-rc6-mm2/include/linux/mm.h
===================================================================
--- linux-2.6.18-rc6-mm2.orig/include/linux/mm.h 2006-09-18
13:16:14.000000000 -0500
+++ linux-2.6.18-rc6-mm2/include/linux/mm.h 2006-09-18 13:28:52.406396556
-0500
@@ -416,7 +416,7 @@ void split_page(struct page *page, unsig
#else
#define ZONETABLE_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
#endif
-#define ZONETABLE_PGSHIFT ZONES_PGSHIFT
+#define ZONETABLE_PGSHIFT ZONES_PGOFF
#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
-
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