linux-kernel - Re: [PATCH 1/2] cpufreq,arm,arm64: restructure definitions of arch_set_freq

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Date:   Wed, 7 Oct 2020 16:21:18 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Ionela Voinescu <ionela.voinescu@....com>
Cc:     sudeep.holla@....com, will@...nel.org, linux@...linux.org.uk,
        rjw@...ysocki.net, viresh.kumar@...aro.org,
        dietmar.eggemann@....com, valentin.schneider@....com,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] cpufreq,arm,arm64: restructure definitions of
 arch_set_freq_scale()

On Thu, Sep 24, 2020 at 01:30:15PM +0100, Ionela Voinescu wrote:
> Compared to other arch_* functions, arch_set_freq_scale() has an atypical
> weak definition that can be replaced by a strong architecture specific
> implementation.
> 
> The more typical support for architectural functions involves defining
> an empty stub in a header file if the symbol is not already defined in
> architecture code. Some examples involve:
>  - #define arch_scale_freq_capacity	topology_get_freq_scale
>  - #define arch_scale_freq_invariant	topology_scale_freq_invariant
>  - #define arch_scale_cpu_capacity	topology_get_cpu_scale
>  - #define arch_update_cpu_topology	topology_update_cpu_topology
>  - #define arch_scale_thermal_pressure	topology_get_thermal_pressure
>  - #define arch_set_thermal_pressure	topology_set_thermal_pressure
> 
> Bring arch_set_freq_scale() in line with these functions by renaming it to
> topology_set_freq_scale() in the arch topology driver, and by defining the
> arch_set_freq_scale symbol to point to the new function for arm and arm64.
> 
> While there are other users of the arch_topology driver, this patch defines
> arch_set_freq_scale for arm and arm64 only, due to their existing
> definitions of arch_scale_freq_capacity. This is the getter function of the
> frequency invariance scale factor and without a getter function, the
> setter function - arch_set_freq_scale() has not purpose.
> 
> Signed-off-by: Ionela Voinescu <ionela.voinescu@....com>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>

For the arm64 changes:

Acked-by: Catalin Marinas <catalin.marinas@....com>