x86: i386: reduce boot fixmap space

Jan Beulich · H. Peter Anvin · commit 48fe4a76e27d · 2008-07-18T16:17:52.000-07:00
As 256 entries are needed, aligning to a 256-entry boundary is
sufficient and still guarantees the single pte table requirement.

Signed-off-by: Jan Beulich &lt;jbeulich@novell.com&gt;
Signed-off-by: H. Peter Anvin &lt;hpa@zytor.com&gt;
diff --git a/include/asm-x86/fixmap_32.h b/include/asm-x86/fixmap_32.h
@@ -90,13 +90,13 @@ enum fixed_addresses {
 	 * 256 temporary boot-time mappings, used by early_ioremap(),
 	 * before ioremap() is functional.
 	 *
-	 * We round it up to the next 512 pages boundary so that we
+	 * We round it up to the next 256 pages boundary so that we
 	 * can have a single pgd entry and a single pte table:
 	 */
 #define NR_FIX_BTMAPS		64
 #define FIX_BTMAPS_NESTING	4
-	FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
-			(__end_of_permanent_fixed_addresses & 511),
+	FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
+			(__end_of_permanent_fixed_addresses & 255),
 	FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
 	FIX_WP_TEST,
 #ifdef CONFIG_ACPI
