linux-kernel - [PATCH 6 of 8] x86: clarify use of _PAGE_CHG

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Message-Id: <c35204feb639fc3dada6.1211268382@localhost>
Date:	Tue, 20 May 2008 08:26:22 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hugh Dickins <hugh@...itas.com>, Theodore Tso <tytso@....edu>,
	Gabriel C <nix.or.die@...glemail.com>,
	Keith Packard <keithp@...thp.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Eric Anholt <eric@...olt.net>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>, airlied@...ux.ie,
	"Barnes, Jesse" <jesse.barnes@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [PATCH 6 of 8] x86: clarify use of _PAGE_CHG_MASK

_PAGE_CHG_MASK is defined as the set of bits not updated by
pte_modify(); specifically, the pfn itself, and the Accessed and Dirty
bits (which are updated by hardware).

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 include/asm-x86/pgtable.h |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -57,6 +57,7 @@
 #define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |	\
 			 _PAGE_DIRTY)
 
+/* Set of bits not changed in pte_modify */
 #define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_PCD | _PAGE_PWT |		\
 			 _PAGE_ACCESSED | _PAGE_DIRTY)
 


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