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x86: clarify use of _PAGE_CHG_MASK

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_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@citrix.com>
Tested-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeremy Fitzhardinge 2008-05-20 08:26:22 +01:00 committed by Linus Torvalds
parent 7f84133af6
commit 86aaf4fd4e
1 changed files with 1 additions and 0 deletions
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include/asm-x86/pgtable.h
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@ -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)