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| author | Andi Kleen <ak@suse.de> | 2005-05-16 21:53:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-17 07:59:13 -0700 |
| commit | 637716a3825e186555361574aa1fa3c0ebf8018b (patch) | |
| tree | 84401d191be109af6eaf2bbf9ad5ae4b6be1260a /include/asm-x86_64/processor.h | |
| parent | 10ffdbb8d605be88b148f127ec86452f1364d4f0 (diff) | |
| download | lwn-637716a3825e186555361574aa1fa3c0ebf8018b.tar.gz lwn-637716a3825e186555361574aa1fa3c0ebf8018b.zip | |
[PATCH] x86_64: Add a guard page at the end of the 47bit address space
This works around a bug in the AMD K8 CPUs.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/processor.h')
| -rw-r--r-- | include/asm-x86_64/processor.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h index f0581c35628e..9f74a286ef11 100644 --- a/include/asm-x86_64/processor.h +++ b/include/asm-x86_64/processor.h @@ -159,9 +159,9 @@ static inline void clear_in_cr4 (unsigned long mask) /* - * User space process size. 47bits. + * User space process size. 47bits minus one guard page. */ -#define TASK_SIZE (0x800000000000UL) +#define TASK_SIZE (0x800000000000UL - 4096) /* This decides where the kernel will search for a free chunk of vm * space during mmap's. |