linux-kernel - Re: [PATCH 2/2] thermal: Move therm

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Date:   Fri, 8 Jan 2021 10:46:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>, linux-pm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] thermal: Move therm_throt there from x86/mce

On Fri, Jan 08, 2021 at 09:54:30AM +0100, Borislav Petkov wrote:
> +#ifdef CONFIG_X86_THERMAL_VECTOR
> +static void unexpected_thermal_interrupt(void)
> +{
> +	pr_err("CPU%d: Unexpected LVT thermal interrupt!\n",
> +		smp_processor_id());
> +}
> +
> +static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;
> +
> +void thermal_set_handler(void (*handler)(void))
> +{
> +	if (handler) {
		WARN_ON(smp_thermal_vector != unexpected_thermal_interrupt);
> +		smp_thermal_vector = handler;
> +	} else
> +		smp_thermal_vector = unexpected_thermal_interrupt;
> +}
> +EXPORT_SYMBOL_GPL(thermal_set_handler);

You really don't want multiple modules to touch that at the same time.

> +DEFINE_IDTENTRY_SYSVEC(sysvec_thermal)
> +{
> +	trace_thermal_apic_entry(THERMAL_APIC_VECTOR);
> +	inc_irq_stat(irq_thermal_count);
> +	smp_thermal_vector();
> +	trace_thermal_apic_exit(THERMAL_APIC_VECTOR);
> +	ack_APIC_irq();
> +}
> +#endif