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authorAndi Kleen <ak@suse.de>2005-05-16 21:53:20 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-17 07:59:13 -0700
commit637716a3825e186555361574aa1fa3c0ebf8018b (patch)
tree84401d191be109af6eaf2bbf9ad5ae4b6be1260a /include/asm-x86_64
parent10ffdbb8d605be88b148f127ec86452f1364d4f0 (diff)
downloadlinux-637716a3825e186555361574aa1fa3c0ebf8018b.tar.gz
[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')
-rw-r--r--include/asm-x86_64/processor.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h
index f0581c35628..9f74a286ef1 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.