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    Subject[PATCH 3/3] x86/mce/therm_throt: allow disabling the thermal vector altogether
    Date
    The thermal IRQ handler uses 1.21% CPU on my system when it's hot from
    compiling things. Indeed looking at /proc/interrupts reveals quite a lot
    of events coming in. Beyond logging them, the existing drivers on the
    system don't appear to do very much that I'm interested in. So, add a
    way to disable this entirely so that I can regain precious CPU cycles.

    Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
    ---
    arch/x86/Kconfig | 4 ++++
    arch/x86/kernel/cpu/mce/intel.c | 3 ++-
    2 files changed, 6 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 39e7444353af..3125a11932f2 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -1157,7 +1157,11 @@ config X86_MCE_INJECT

    config X86_THERMAL_VECTOR
    def_bool y
    + prompt "Machine check thermal vector"
    depends on X86_MCE_INTEL
    + ---help---
    + Provide support for capturing thermal events, logging them, and
    + passing them off to other drivers.

    config X86_MCE_THERMAL_VERBOSE
    bool "Verbose logging for thermal events"
    diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
    index f996ffb887bc..d14f1922fb49 100644
    --- a/arch/x86/kernel/cpu/mce/intel.c
    +++ b/arch/x86/kernel/cpu/mce/intel.c
    @@ -511,7 +511,8 @@ static void intel_ppin_init(struct cpuinfo_x86 *c)

    void mce_intel_feature_init(struct cpuinfo_x86 *c)
    {
    - intel_init_thermal(c);
    + if (IS_ENABLED(CONFIG_X86_THERMAL_VECTOR))
    + intel_init_thermal(c);
    intel_init_cmci();
    intel_init_lmce();
    intel_ppin_init(c);
    --
    2.26.0
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