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yaml --- r: 80228 b: refs/heads/master c: f291923 h: refs/heads/master v: v3
git-mirror · Jan 30, 2008 · 776e4d9 · 776e4d9
1 parent e979d35
commit 776e4d9
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Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 015c8dd0cb3b380cb4c3930968250c719d1dd303
+refs/heads/master: f29192320f22f1617d50a9c790862603eeef64e6
diff --git a/trunk/include/asm-x86/pgtable.h b/trunk/include/asm-x86/pgtable.h
@@ -19,6 +19,11 @@
 #define _PAGE_BIT_UNUSED3	11
 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
 
+/*
+ * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
+ * sign-extended value on 32-bit with all 1's in the upper word,
+ * which preserves the upper pte values on 64-bit ptes:
+ */
 #define _PAGE_PRESENT	(_AC(1, L)<<_PAGE_BIT_PRESENT)
 #define _PAGE_RW	(_AC(1, L)<<_PAGE_BIT_RW)
 #define _PAGE_USER	(_AC(1, L)<<_PAGE_BIT_USER)