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authorMark Lord <lkml@rtr.ca>2006-02-01 06:06:11 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 11:53:21 -0500
commit975b3d3d5b983eb60706d35f0d24cd19f6badabf (patch)
tree39d55db9236ef1acef4e955617296217c3a9fc02 /include/asm-i386
parent4940fb441275d654cff7d0f7708f91bd8435a85a (diff)
[PATCH] VMSPLIT config options
Enable selection of different user/kernel VM splits for i386, including an optimized mode for 1GB physical RAM, which gives the kernel a direct (non HIGHMEM) mapping to the entire 1GB rather than just the first 896MB. There is a similarly a similarly optimized mode for machines with exactly 2GB of physical RAM. This can speed up the kernel by avoiding having to create/destroy temporary HIGHMEM mappings, and by not having to include HIGHMEM support at all on such machines. The flip side is that there's less virtual addressing left for userspace in these alternatives, and some binary-only kernel modules may misbehave unless rebuilt with the same VMSPLIT option as the main kernel image. Original idea/patch from Jens Axboe, modified based on suggestions from Linus et al. Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/page.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h
index 73296d9924fb..997ca5d17876 100644
--- a/include/asm-i386/page.h
+++ b/include/asm-i386/page.h
@@ -110,10 +110,10 @@ extern int page_is_ram(unsigned long pagenr);
110#endif /* __ASSEMBLY__ */ 110#endif /* __ASSEMBLY__ */
111 111
112#ifdef __ASSEMBLY__ 112#ifdef __ASSEMBLY__
113#define __PAGE_OFFSET (0xC0000000) 113#define __PAGE_OFFSET CONFIG_PAGE_OFFSET
114#define __PHYSICAL_START CONFIG_PHYSICAL_START 114#define __PHYSICAL_START CONFIG_PHYSICAL_START
115#else 115#else
116#define __PAGE_OFFSET (0xC0000000UL) 116#define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
117#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START) 117#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
118#endif 118#endif
119#define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START) 119#define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)