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[PATCH] x86_64: Add a guard page at the end of the 47bit address space
author
Andi Kleen
<ak@suse.de>
Tue, 17 May 2005 04:53:20 +0000
(21:53 -0700)
committer
Linus Torvalds
<torvalds@ppc970.osdl.org>
Tue, 17 May 2005 14:59:13 +0000
(07:59 -0700)
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
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diff --git
a/include/asm-x86_64/processor.h
b/include/asm-x86_64/processor.h
index
f0581c3
..
9f74a28
100644
(file)
--- 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.