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Subject[RFC] [PATCH] virtual memmap on sparsemem v3 [3/4] static virtual mem_map
This patch adds support for statically allocated virtual mem_map.
(means virtual address of mem_map array is defined statically.)
This removes reference to *(&mem_map).

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


Index: devel-2.6.19/include/linux/mmzone.h
===================================================================
--- devel-2.6.19.orig/include/linux/mmzone.h 2006-12-08 15:04:30.000000000 +0900
+++ devel-2.6.19/include/linux/mmzone.h 2006-12-08 15:05:18.000000000 +0900
@@ -618,8 +618,13 @@
#if (((BITS_PER_LONG/4) * PAGES_PER_SECTION) % PAGE_SIZE) != 0
#error "PAGE_SIZE/SECTION_SIZE relationship is not suitable for vmem_map"
#endif
+#ifdef CONFIG_SPARSEMEM_VMEMMAP_STATIC
+#include <linux/mm_types.h>
+extern struct page mem_map[];
+#else
extern struct page* mem_map;
#endif
+#endif

static inline struct page *__section_mem_map_addr(struct mem_section *section)
{
Index: devel-2.6.19/mm/Kconfig
===================================================================
--- devel-2.6.19.orig/mm/Kconfig 2006-12-08 15:05:10.000000000 +0900
+++ devel-2.6.19/mm/Kconfig 2006-12-08 15:05:18.000000000 +0900
@@ -121,6 +121,10 @@
But this consumes huge amount of virtual memory(not physical).
This option is selectable only if your arch supports it.

+config SPARSEMEM_VMEMMAP_STATIC
+ def_bool y
+ depends on ARCH_SPARSEMEM_VMEMMAP_STATIC
+
# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
Index: devel-2.6.19/mm/memory.c
===================================================================
--- devel-2.6.19.orig/mm/memory.c 2006-12-08 15:03:02.000000000 +0900
+++ devel-2.6.19/mm/memory.c 2006-12-08 15:09:00.000000000 +0900
@@ -71,7 +71,9 @@

#ifdef CONFIG_SPARSEMEM_VMEMMAP
/* for the virtual mem_map */
+#ifndef CONFIG_SPARSEMEM_VMEMMAP_STATIC
struct page *mem_map;
+#endif
EXPORT_SYMBOL(mem_map);
#endif

-
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