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    Subject[PATCH 07/37] x86, pkeys: Add Kconfig option
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    From: Dave Hansen <dave.hansen@linux.intel.com>

    I don't have a strong opinion on whether we need a Kconfig prompt
    or not. Protection Keys has relatively little code associated
    with it, and it is not a heavyweight feature to keep enabled.
    However, I can imagine that folks would still appreciate being
    able to disable it.

    Note that, with disabled-features.h, the checks in the code
    for protection keys are always the same:

    cpu_has(c, X86_FEATURE_PKU)

    With the config option disabled, this essentially turns into an
    #ifdef.

    We will hide the prompt for now.

    Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
    ---

    b/arch/x86/Kconfig | 4 ++++
    1 file changed, 4 insertions(+)

    diff -puN arch/x86/Kconfig~pkeys-01-kconfig arch/x86/Kconfig
    --- a/arch/x86/Kconfig~pkeys-01-kconfig 2015-11-16 12:35:38.310306736 -0800
    +++ b/arch/x86/Kconfig 2015-11-16 12:35:38.314306917 -0800
    @@ -1680,6 +1680,10 @@ config X86_INTEL_MPX

    If unsure, say N.

    +config X86_INTEL_MEMORY_PROTECTION_KEYS
    + def_bool y
    + depends on CPU_SUP_INTEL && X86_64
    +
    config EFI
    bool "EFI runtime service support"
    depends on ACPI
    _

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