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Date: Tue, 7 Apr 2020 00:33:45 -0600 From: "Jason A. Donenfeld" <Jason@...c4.com> To: linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org, x86@...nel.org, arnd@...db.de, srinivas.pandruvada@...ux.intel.com, bberg@...hat.com, bp@...e.de Cc: "Jason A. Donenfeld" <Jason@...c4.com> Subject: [PATCH 3/3] x86/mce/therm_throt: allow disabling the thermal vector altogether 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@...c4.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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