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    Subject[PATCH 23/27] x86: debugctlmsr kconfig
    Date

    This adds the (internal) Kconfig macro CONFIG_X86_DEBUGCTLMSR,
    to be defined when configuring to support only hardware that
    definitely supports MSR_IA32_DEBUGCTLMSR with the BTF flag.

    The Intel documentation says "P6 family" and later processors all have it.
    I think the Kconfig dependencies are right to have it set for those and
    unset for others (i.e., when 586 and earlier are supported).

    Signed-off-by: Roland McGrath <roland@redhat.com>
    ---
    arch/x86/Kconfig.cpu | 4 ++++
    1 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
    index c301622..69e2ee4 100644
    --- a/arch/x86/Kconfig.cpu
    +++ b/arch/x86/Kconfig.cpu
    @@ -399,3 +399,7 @@ config X86_MINIMUM_CPU_FAMILY
    default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
    default "3"

    +config X86_DEBUGCTLMSR
    + bool
    + depends on !(M586MMX || M586TSC || M586 || M486 || M386)
    + default y
    -
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