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authorChristoph Lameter <clameter@sgi.com>2007-10-16 10:24:15 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 18:42:51 +0200
commit0889eba5b38f66d7d892a167d88284daddd3d43b (patch)
treeadb578bb92cc18dbf842a9bde67e3861db030557 /include/asm-x86/page_64.h
parentvmemmap: generify initialisation via helpers (diff)
downloadlinux-0889eba5b38f66d7d892a167d88284daddd3d43b.tar.xz
linux-0889eba5b38f66d7d892a167d88284daddd3d43b.zip
x86_64: SPARSEMEM_VMEMMAP 2M page size support
x86_64 uses 2M page table entries to map its 1-1 kernel space. We also implement the virtual memmap using 2M page table entries. So there is no additional runtime overhead over FLATMEM, initialisation is slightly more complex. As FLATMEM still references memory to obtain the mem_map pointer and SPARSEMEM_VMEMMAP uses a compile time constant, SPARSEMEM_VMEMMAP should be superior. With this SPARSEMEM becomes the most efficient way of handling virt_to_page, pfn_to_page and friends for UP, SMP and NUMA on x86_64. [apw@shadowen.org: code resplit, style fixups] [apw@shadowen.org: vmemmap x86_64: ensure end of section memmap is initialised] Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: Andi Kleen <ak@suse.de> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86/page_64.h')
-rw-r--r--include/asm-x86/page_64.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/page_64.h b/include/asm-x86/page_64.h
index 88adf1afb0a2..c3b52bcb171e 100644
--- a/include/asm-x86/page_64.h
+++ b/include/asm-x86/page_64.h
@@ -134,6 +134,7 @@ extern unsigned long __phys_addr(unsigned long);
VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#define __HAVE_ARCH_GATE_AREA 1
+#define vmemmap ((struct page *)VMEMMAP_START)
#include <asm-generic/memory_model.h>
#include <asm-generic/page.h>