From 637716a3825e186555361574aa1fa3c0ebf8018b Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Mon, 16 May 2005 21:53:20 -0700
Subject: [PATCH] [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>
---
 include/asm-x86_64/processor.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h
index f0581c35628e8..9f74a286ef111 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.
-- 
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