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[PATCH] mm: correct _PAGE_FILE comment

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_PAGE_FILE does not indicate whether a file is in page / swap cache, it is
set just for non-linear PTE's.  Correct the comment for i386, x86_64, UML.
Also clearify _PAGE_NONE.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-09-03 15:54:57 -07:00 committed by Linus Torvalds
parent 4944e76d81
commit 9b4ee40ebb
3 changed files with 11 additions and 9 deletions
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10
include/asm-i386/pgtable.h
View File

@ -86,9 +86,7 @@ void paging_init(void);
#endif
/*
* The 4MB page is guessing.. Detailed in the infamous "Chapter H"
* of the Pentium details, but assuming intel did the straightforward
* thing, this bit set in the page directory entry just means that
* _PAGE_PSE set in the page directory entry just means that
* the page directory entry points directly to a 4MB-aligned block of
* memory.
*/
@ -119,8 +117,10 @@ void paging_init(void);
#define _PAGE_UNUSED2 0x400
#define _PAGE_UNUSED3 0x800
#define _PAGE_FILE 0x040 /* set:pagecache unset:swap */
#define _PAGE_PROTNONE 0x080 /* If not present */
/* If _PAGE_PRESENT is clear, we use these: */
#define _PAGE_FILE 0x040 /* nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_PROTNONE 0x080 /* if the user mapped it with PROT_NONE;
pte_present gives true */
#ifdef CONFIG_X86_PAE
#define _PAGE_NX (1ULL<<_PAGE_BIT_NX)
#else

8
include/asm-um/pgtable.h
View File

@ -16,13 +16,15 @@
#define _PAGE_PRESENT 0x001
#define _PAGE_NEWPAGE 0x002
#define _PAGE_NEWPROT 0x004
#define _PAGE_FILE 0x008 /* set:pagecache unset:swap */
#define _PAGE_PROTNONE 0x010 /* If not present */
#define _PAGE_NEWPROT 0x004
#define _PAGE_RW 0x020
#define _PAGE_USER 0x040
#define _PAGE_ACCESSED 0x080
#define _PAGE_DIRTY 0x100
/* If _PAGE_PRESENT is clear, we use these: */
#define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE;
pte_present gives true */
#ifdef CONFIG_3_LEVEL_PGTABLES
#include "asm/pgtable-3level.h"

2
include/asm-x86_64/pgtable.h
View File

@ -143,7 +143,7 @@ extern inline void pgd_clear (pgd_t * pgd)
#define _PAGE_ACCESSED 0x020
#define _PAGE_DIRTY 0x040
#define _PAGE_PSE 0x080 /* 2MB page */
#define _PAGE_FILE 0x040 /* set:pagecache, unset:swap */
#define _PAGE_FILE 0x040 /* nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_GLOBAL 0x100 /* Global TLB entry */
#define _PAGE_PROTNONE 0x080 /* If not present */