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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2005-09-04 00:54:57 +0200
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 09:05:45 +0200
commit9b4ee40ebbbaf3f8c775b023d89ceedda1167d79 (patch)
treee227c96cf51beaa942fefa64277618e5cfc71217 /include/asm-i386
parent[PATCH] mm: remove implied vm_ops check (diff)
downloadlinux-9b4ee40ebbbaf3f8c775b023d89ceedda1167d79.tar.xz
linux-9b4ee40ebbbaf3f8c775b023d89ceedda1167d79.zip
[PATCH] mm: correct _PAGE_FILE comment
_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>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/pgtable.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 77c6497f416e..c797286b512f 100644
--- a/include/asm-i386/pgtable.h
+++ b/include/asm-i386/pgtable.h
@@ -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