linux-kernel - Re: [PATCH v1 4/6] clk: tegra: Add stubs needed for compile testing

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Message-ID: <fe54d967-4fd0-5129-2d15-b1271490306a@gmail.com>
Date:   Mon, 4 Oct 2021 23:41:04 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/6] clk: tegra: Add stubs needed for compile testing

04.10.2021 23:02, Thierry Reding пишет:
> On Mon, Oct 04, 2021 at 09:33:57PM +0200, Thierry Reding wrote:
>> On Sun, Sep 12, 2021 at 11:29:05PM +0300, Dmitry Osipenko wrote:
>>> Add stubs needed for compile-testing of tegra-cpuidle driver.
>>>
>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>> ---
>>>  include/linux/clk/tegra.h | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h
>>> index d128ad1570aa..9bd06d8a5436 100644
>>> --- a/include/linux/clk/tegra.h
>>> +++ b/include/linux/clk/tegra.h
>>> @@ -42,7 +42,11 @@ struct tegra_cpu_car_ops {
>>>  #endif
>>>  };
>>>  
>>> +#ifdef CONFIG_ARCH_TEGRA
>>>  extern struct tegra_cpu_car_ops *tegra_cpu_car_ops;
>>> +#else
>>> +static struct tegra_cpu_car_ops *tegra_cpu_car_ops __maybe_unused;
>>> +#endif
>>
>> Ugh... this one seems a bit over the top, to be honest. The only place
>> where this seems to be used is in arch/arm/mach-tegra/pm.c, but that
>> already uses one of the stubs from include/linux/clk/tegra.h, so I'm
>> wondering if we can't define that latter stub in a way to make it
>> unnecessary to declare this bogus pointer.
>>
>> I'll play around with this a little bit.
> 
> The below does the trick for me as well:
> 
> --- >8 ---
> diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h
> index d128ad1570aa..d261db7e6060 100644
> --- a/include/linux/clk/tegra.h
> +++ b/include/linux/clk/tegra.h
> @@ -42,6 +42,7 @@ struct tegra_cpu_car_ops {
>  #endif
>  };
> 
> +#ifdef CONFIG_ARCH_TEGRA
>  extern struct tegra_cpu_car_ops *tegra_cpu_car_ops;
> 
>  static inline void tegra_wait_cpu_in_reset(u32 cpu)
> @@ -83,6 +84,27 @@ static inline void tegra_disable_cpu_clock(u32 cpu)
> 
>  	tegra_cpu_car_ops->disable_clock(cpu);
>  }
> +#else
> +static inline void tegra_wait_cpu_in_reset(u32 cpu)
> +{
> +}
> +
> +static inline void tegra_put_cpu_in_reset(u32 cpu)
> +{
> +}
> +
> +static inline void tegra_cpu_out_of_reset(u32 cpu)
> +{
> +}
> +
> +static inline void tegra_enable_cpu_clock(u32 cpu)
> +{
> +}
> +
> +static inline void tegra_disable_cpu_clock(u32 cpu)
> +{
> +}
> +#endif
> 
>  #ifdef CONFIG_PM_SLEEP
>  static inline bool tegra_cpu_rail_off_ready(void)
> --- >8 ---
> 
> Do you mind if I replace your version with that? I think that's a little
> bit cleaner because it should be easier for the compiler to completely
> compile it out.

I don't mind, please choose what you prefer more. This was one of the
first variants of this patch, it adds more lines and it won't be
compiled with ARCH_TEGRA=n and COMPILE_TEST=n anyways.