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SubjectRe: [PATCH resend -tip] x86,mcheck: Thermal monitoring depends on APIC being enabled
(2009/12/12 23:31), Cyrill Gorcunov wrote:
> 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 <tglx@linutronix.de>
> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
> ---
>
> Please review. This should close a number of WARNs triggered
> by intel_init_thermal when apic gets disabled state.
>
> Ie the WARNs like
>
> http://kerneloops.org/oops.php?number=974702
>
> arch/x86/kernel/cpu/mcheck/therm_throt.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)

Looks good.
Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>


And I think that the following incremental patch is reasonable
to apply on it.


Thanks,
H.Seto

===
Subject: [PATCH] x86, mce: introduce intel_thermal_supported

Have a common function.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
---
arch/x86/kernel/cpu/mcheck/therm_throt.c | 17 ++++++++++++-----
1 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index 687638e..4f4c8bb 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -256,6 +256,16 @@ asmlinkage void smp_thermal_interrupt(struct pt_regs *regs)
ack_APIC_irq();
}

+/* Thermal monitoring depends on APIC, ACPI and clock modulation */
+static int intel_thermal_supported(struct cpuinfo_x86 *c)
+{
+ if (!cpu_has_apic)
+ return 0;
+ if (!cpu_has(c, X86_FEATURE_ACPI) || !cpu_has(c, X86_FEATURE_ACC))
+ return 0;
+ return 1;
+}
+
void __init mcheck_intel_therm_init(void)
{
/*
@@ -263,8 +273,7 @@ void __init mcheck_intel_therm_init(void)
* LVT value on BSP and use that value to restore APs' thermal LVT
* entry BIOS programmed later
*/
- if (cpu_has(&boot_cpu_data, X86_FEATURE_ACPI) &&
- cpu_has(&boot_cpu_data, X86_FEATURE_ACC))
+ if (intel_thermal_supported(&boot_cpu_data))
lvtthmr_init = apic_read(APIC_LVTTHMR);
}

@@ -274,9 +283,7 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
int tm2 = 0;
u32 l, h;

- /* 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))
+ if (!intel_thermal_supported(c))
return;

/*
--
1.6.5.5


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