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    Subject[PATCH] [2/3] x86: Remove CONFIG_GBPAGES option
    Date

    Support for GB pages mapped direct memory has been around for quite
    some time and has not caused any problems as far as I know.

    So it's time to remove the CONFIG_GBPAGES option and always enable
    it by default. The option only controlled the default anyways, no
    code. gbpages can be still disabled at runtime.

    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    arch/x86/Kconfig | 9 ---------
    arch/x86/mm/init.c | 6 +-----
    2 files changed, 1 insertion(+), 14 deletions(-)

    Index: linux-2.6.32-ak/arch/x86/Kconfig
    ===================================================================
    --- linux-2.6.32-ak.orig/arch/x86/Kconfig
    +++ linux-2.6.32-ak/arch/x86/Kconfig
    @@ -1110,15 +1110,6 @@ config X86_PAE
    config ARCH_PHYS_ADDR_T_64BIT
    def_bool X86_64 || X86_PAE

    -config DIRECT_GBPAGES
    - bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
    - default y
    - depends on X86_64
    - ---help---
    - Allow the kernel linear mapping to use 1GB pages on CPUs that
    - support it. This can improve the kernel's performance a tiny bit by
    - reducing TLB pressure. If in doubt, say "Y".
    -
    # Common NUMA Features
    config NUMA
    bool "Numa Memory Allocation and Scheduler Support"
    Index: linux-2.6.32-ak/arch/x86/mm/init.c
    ===================================================================
    --- linux-2.6.32-ak.orig/arch/x86/mm/init.c
    +++ linux-2.6.32-ak/arch/x86/mm/init.c
    @@ -22,11 +22,7 @@ unsigned long __meminitdata e820_table_t

    int after_bootmem;

    -int direct_gbpages
    -#ifdef CONFIG_DIRECT_GBPAGES
    - = 1
    -#endif
    -;
    +int direct_gbpages = 1;

    static void __init find_early_table_space(unsigned long end, int use_pse,
    int use_gbpages)

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