Messages in this thread Patch in this message | | | Date | Fri, 29 Aug 2008 13:14:30 +0100 | From | "Jan Beulich" <> | Subject | [PATCH] x86-64: reduce boot fixmap space |
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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>
--- include/asm-x86/fixmap_64.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- linux-2.6.27-rc5/include/asm-x86/fixmap_64.h 2008-08-29 10:53:26.000000000 +0200 +++ 2.6.27-rc5-x86_64-btmap-fixmap/include/asm-x86/fixmap_64.h 2008-08-22 15:24:33.000000000 +0200 @@ -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 };
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