x86-64: reduce boot fixmap space

Just like for 32-bit - as 256 entries are needed, aligning to a
256-entry boundary is sufficient and still guarantees the single pte
table requirement.

Likewise move up __end_of_permanent_fixed_addresses, to match 32-bit.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/asm-x86/fixmap_64.h b/include/asm-x86/fixmap_64.h
index dafb24b..33df64f 100644 (file)
--- a/include/asm-x86/fixmap_64.h
+++ b/include/asm-x86/fixmap_64.h
@@ -49,6 +49,7 @@ enum fixed_addresses {
 #ifdef CONFIG_PARAVIRT
        FIX_PARAVIRT_BOOTMAP,
 #endif
+       __end_of_permanent_fixed_addresses,
 #ifdef CONFIG_ACPI
        FIX_ACPI_BEGIN,
        FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
@@ -56,18 +57,17 @@ enum fixed_addresses {
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
        FIX_OHCI1394_BASE,
 #endif
-       __end_of_permanent_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,
        __end_of_fixed_addresses
 };