From: Jan Beulich Date: Fri, 29 Aug 2008 12:14:30 +0000 (+0100) Subject: x86-64: reduce boot fixmap space X-Git-Tag: v2.6.28-rc1~611^2~98 X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=9f8305fe164077bcef42034c56275c8208042e88 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 Signed-off-by: Ingo Molnar --- diff --git a/include/asm-x86/fixmap_64.h b/include/asm-x86/fixmap_64.h index dafb24b..33df64f 100644 --- 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 };