ZONE_DMA less operation for IA64 SGI platform
Disable ZONE_DMA for SGI SN2. All memory is addressable by all
devices and we do not need any special memory pool.
Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]>
Index: linux-2.6.18-rc6-mm1/arch/ia64/mm/discontig.c
===================================================================
--- linux-2.6.18-rc6-mm1.orig/arch/ia64/mm/discontig.c 2006-09-11
16:42:07.206714114 -0500
+++ linux-2.6.18-rc6-mm1/arch/ia64/mm/discontig.c 2006-09-11
16:51:50.094129334 -0500
@@ -37,7 +37,9 @@
unsigned long pernode_size;
struct bootmem_data bootmem_data;
unsigned long num_physpages;
+#ifdef CONFIG_ZONE_DMA
unsigned long num_dma_physpages;
+#endif
unsigned long min_pfn;
unsigned long max_pfn;
};
@@ -656,9 +658,11 @@
add_active_range(node, start >> PAGE_SHIFT, end >> PAGE_SHIFT);
mem_data[node].num_physpages += len >> PAGE_SHIFT;
+#ifdef CONFIG_ZONE_DMA
if (start <= __pa(MAX_DMA_ADDRESS))
mem_data[node].num_dma_physpages +=
(min(end, __pa(MAX_DMA_ADDRESS)) - start) >>PAGE_SHIFT;
+#endif
start = GRANULEROUNDDOWN(start);
start = ORDERROUNDDOWN(start);
end = GRANULEROUNDUP(end);
@@ -709,7 +713,9 @@
max_pfn = mem_data[node].max_pfn;
}
+#ifdef CONFIG_ZONE_DMA
max_zone_pfns[ZONE_DMA] = max_dma;
+#endif
max_zone_pfns[ZONE_NORMAL] = max_pfn;
free_area_init_nodes(max_zone_pfns);
Index: linux-2.6.18-rc6-mm1/arch/ia64/mm/contig.c
===================================================================
--- linux-2.6.18-rc6-mm1.orig/arch/ia64/mm/contig.c 2006-09-11
16:42:07.215503923 -0500
+++ linux-2.6.18-rc6-mm1/arch/ia64/mm/contig.c 2006-09-11 16:51:50.104872434
-0500
@@ -231,8 +231,10 @@
num_physpages = 0;
efi_memmap_walk(count_pages, &num_physpages);
+#ifdef CONFIG_ZONE_DMA
max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
max_zone_pfns[ZONE_DMA] = max_dma;
+#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_VIRTUAL_MEM_MAP
Index: linux-2.6.18-rc6-mm1/arch/ia64/Kconfig
===================================================================
--- linux-2.6.18-rc6-mm1.orig/arch/ia64/Kconfig 2006-09-11 16:44:55.649739769
-0500
+++ linux-2.6.18-rc6-mm1/arch/ia64/Kconfig 2006-09-11 16:51:50.114638888
-0500
@@ -23,8 +23,8 @@
default y
config ZONE_DMA
- bool
- default y
+ def_bool y
+ depends on !IA64_SGI_SN2
config MMU
bool
-
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