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Commit 637716a3 authored May 16, 2005 by Andi Kleen Committed by Linus Torvalds May 17, 2005

[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>

parent 10ffdbb8

include/asm-x86_64/processor.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -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.