x86: i386: reduce boot fixmap space

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 <jbeulich@novell.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/asm-x86/fixmap_32.h b/include/asm-x86/fixmap_32.h
index aae2f0501a40..f1ac2b2167d7 100644
--- 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