[PATCH] sparsemem memory model for i386
Provide the architecture specific implementation for SPARSEMEM for i386 SMP
and NUMA systems.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/i386/mm/Makefile b/arch/i386/mm/Makefile
index fc32725..80908b5 100644
--- a/arch/i386/mm/Makefile
+++ b/arch/i386/mm/Makefile
@@ -4,7 +4,7 @@
obj-y := init.o pgtable.o fault.o ioremap.o extable.o pageattr.o mmap.o
-obj-$(CONFIG_DISCONTIGMEM) += discontig.o
+obj-$(CONFIG_NUMA) += discontig.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_HIGHMEM) += highmem.o
obj-$(CONFIG_BOOT_IOREMAP) += boot_ioremap.o
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index 088ca47..0efeb96 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -42,12 +42,16 @@
* populated the following initialisation.
*
* 1) node_online_map - the map of all nodes configured (online) in the system
- * 2) physnode_map - the mapping between a pfn and owning node
- * 3) node_start_pfn - the starting page frame number for a node
+ * 2) node_start_pfn - the starting page frame number for a node
* 3) node_end_pfn - the ending page fram number for a node
*/
+unsigned long node_start_pfn[MAX_NUMNODES];
+unsigned long node_end_pfn[MAX_NUMNODES];
+
+#ifdef CONFIG_DISCONTIGMEM
/*
+ * 4) physnode_map - the mapping between a pfn and owning node
* physnode_map keeps track of the physical memory layout of a generic
* numa node on a 256Mb break (each element of the array will
* represent 256Mb of memory and will be marked by the node id. so,
@@ -85,9 +89,7 @@
return (nr_pages + 1) * sizeof(struct page);
}
-
-unsigned long node_start_pfn[MAX_NUMNODES];
-unsigned long node_end_pfn[MAX_NUMNODES];
+#endif
extern unsigned long find_max_low_pfn(void);
extern void find_max_pfn(void);
@@ -390,24 +392,26 @@
{
#ifdef CONFIG_HIGHMEM
struct zone *zone;
+ struct page *page;
for_each_zone(zone) {
- unsigned long node_pfn, node_high_size, zone_start_pfn;
- struct page * zone_mem_map;
-
+ unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
+
if (!is_highmem(zone))
continue;
- printk("Initializing %s for node %d\n", zone->name,
- zone->zone_pgdat->node_id);
-
- node_high_size = zone->spanned_pages;
- zone_mem_map = zone->zone_mem_map;
zone_start_pfn = zone->zone_start_pfn;
+ zone_end_pfn = zone_start_pfn + zone->spanned_pages;
- for (node_pfn = 0; node_pfn < node_high_size; node_pfn++) {
- one_highpage_init((struct page *)(zone_mem_map + node_pfn),
- zone_start_pfn + node_pfn, bad_ppro);
+ printk("Initializing %s for node %d (%08lx:%08lx)\n",
+ zone->name, zone->zone_pgdat->node_id,
+ zone_start_pfn, zone_end_pfn);
+
+ for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
+ if (!pfn_valid(node_pfn))
+ continue;
+ page = pfn_to_page(node_pfn);
+ one_highpage_init(page, node_pfn, bad_ppro);
}
}
totalram_pages += totalhigh_pages;
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index 666ca79..48ebfab7 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -276,7 +276,9 @@
SetPageReserved(page);
}
-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_NUMA
+extern void set_highmem_pages_init(int);
+#else
static void __init set_highmem_pages_init(int bad_ppro)
{
int pfn;
@@ -284,9 +286,7 @@
one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
totalram_pages += totalhigh_pages;
}
-#else
-extern void set_highmem_pages_init(int);
-#endif /* !CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_FLATMEM */
#else
#define kmap_init() do { } while (0)
@@ -297,10 +297,10 @@
unsigned long long __PAGE_KERNEL = _PAGE_KERNEL;
unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
-#ifndef CONFIG_DISCONTIGMEM
-#define remap_numa_kva() do {} while (0)
-#else
+#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
+#else
+#define remap_numa_kva() do {} while (0)
#endif
static void __init pagetable_init (void)
@@ -525,7 +525,7 @@
#else
num_physpages = max_low_pfn;
#endif
-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
max_mapnr = num_physpages;
#endif
}
@@ -539,7 +539,7 @@
int tmp;
int bad_ppro;
-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
if (!mem_map)
BUG();
#endif
