linux-kernel - Re: [PATCH v4 3/3] arm64: implement CPPC FFH support using AMUs

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Message-ID: <20201112180045.GO29613@gaia>
Date:   Thu, 12 Nov 2020 18:00:46 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Ionela Voinescu <ionela.voinescu@....com>
Cc:     mark.rutland@....com, sudeep.holla@....com, will@...nel.org,
        morten.rasmussen@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] arm64: implement CPPC FFH support using AMUs

On Fri, Nov 06, 2020 at 12:53:34PM +0000, Ionela Voinescu wrote:
> +static inline
> +int counters_read_on_cpu(int cpu, smp_call_func_t func, u64 *val)
> +{
> +	if (!cpu_has_amu_feat(cpu))
> +		return -EOPNOTSUPP;
> +
> +	smp_call_function_single(cpu, func, val, 1);
> +
> +	return 0;
> +}

I got lost in the cpufreq call chains. Can this function ever be called
with interrupts disabled?

-- 
Catalin