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. Signed-off-by: Christoph Lameter <clameter@xxxxxxx> Index: linux-2.6.18-rc6-mm1/include/linux/mm.h =================================================================== --- linux-2.6.18-rc6-mm1.orig/include/linux/mm.h 2006-09-11 15:42:30.576324881 -0500 +++ linux-2.6.18-rc6-mm1/include/linux/mm.h 2006-09-11 15:57:17.451691199 -0500 @@ -476,7 +476,7 @@ #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 Index: linux-2.6.18-rc6-mm1/mm/mempolicy.c =================================================================== --- linux-2.6.18-rc6-mm1.orig/mm/mempolicy.c 2006-09-11 15:42:30.591951213 -0500 +++ linux-2.6.18-rc6-mm1/mm/mempolicy.c 2006-09-11 15:57:17.466340884 -0500 @@ -105,7 +105,7 @@ /* 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-mm1/mm/page_alloc.c =================================================================== --- linux-2.6.18-rc6-mm1.orig/mm/page_alloc.c 2006-09-11 15:42:30.000000000 -0500 +++ linux-2.6.18-rc6-mm1/mm/page_alloc.c 2006-09-11 16:44:51.877934885 -0500 @@ -2486,11 +2486,11 @@ " %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)) - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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