[PATCH] mm: correct _PAGE_FILE comment

[safe/jmp/linux-2.6] / include / asm-i386 / pgtable.h

diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h
index 77c6497..c797286 100644 (file)
--- 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