From 637716a3825e186555361574aa1fa3c0ebf8018b Mon Sep 17 00:00:00 2001 From: Andi Kleen 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 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. -- 2.20.1