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authorJeremy Fitzhardinge <jeremy@goop.org>2008-05-20 08:26:22 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-20 07:51:21 -0700
commit86aaf4fd4ea25ddde05772d03b93dbce23c0ead1 (patch)
treec959928776c649efa87842db6243460633591681 /include/asm-x86/pgtable.h
parent7f84133af6aaa86e9ef0e9e1970655439a8cf3a1 (diff)
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@citrix.com> Tested-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86/pgtable.h')
-rw-r--r--include/asm-x86/pgtable.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 55c3a0e3a8ce..b816134f753a 100644
--- 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)