From: Cyrill Gorcunov Date: Mon, 14 Dec 2009 08:56:34 +0000 (+0900) Subject: x86, mce: Thermal monitoring depends on APIC being enabled X-Git-Tag: firefly_0821_release~11625^2~325 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8410b13cced2fa9aee301d4722a5ce751fcc253a;p=firefly-linux-kernel-4.4.55.git x86, mce: Thermal monitoring depends on APIC being enabled commit 485a2e1973fd9f98c2c6776e66ac4721882b69e0 upstream. Add check if APIC is not disabled since thermal monitoring depends on it. As only apic gets disabled we should not try to install "thermal monitor" vector, print out that thermal monitoring is enabled and etc... Note that "Intel Correct Machine Check Interrupts" already has such a check. Also I decided to not add cpu_has_apic check into mcheck_intel_therm_init since even if it'll call apic_read on disabled apic -- it's safe here and allow us to save a few code bytes. Reported-by: Thomas Gleixner Signed-off-by: Cyrill Gorcunov Signed-off-by: Hidetoshi Seto LKML-Reference: <4B25FDC2.3020401@jp.fujitsu.com> Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c index 4fef985fc221..687638e655d3 100644 --- a/arch/x86/kernel/cpu/mcheck/therm_throt.c +++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c @@ -274,8 +274,9 @@ void intel_init_thermal(struct cpuinfo_x86 *c) int tm2 = 0; u32 l, h; - /* Thermal monitoring depends on ACPI and clock modulation*/ - if (!cpu_has(c, X86_FEATURE_ACPI) || !cpu_has(c, X86_FEATURE_ACC)) + /* Thermal monitoring depends on APIC, ACPI and clock modulation */ + if (!cpu_has_apic || !cpu_has(c, X86_FEATURE_ACPI) || + !cpu_has(c, X86_FEATURE_ACC)) return; /*