[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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
processor.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
Index: release-2.6.11/include/asm-x86_64/processor.h
===================================================================
--- release-2.6.11.orig/include/asm-x86_64/processor.h
+++ release-2.6.11/include/asm-x86_64/processor.h
@@ -160,9 +160,9 @@ static inline void clear_in_cr4 (unsigne
/*
- * 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.
-
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