linux-kernel - Re: [PATCH] firmware: tegra-bpmp: mark PM function as __maybe

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Date:   Wed, 3 Oct 2018 09:26:16 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Timo Alho <talho@...dia.com>
CC:     Mikko Perttunen <mperttunen@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] firmware: tegra-bpmp: mark PM function as __maybe_unused


On 02/10/18 22:21, Arnd Bergmann wrote:
> The newly added tegra_bpmp_resume function is unused when CONFIG_PM
> is disabled:
> 
> drivers/firmware/tegra/bpmp.c:847:12: error: 'tegra_bpmp_resume' defined but not used [-Werror=unused-function]
>  static int tegra_bpmp_resume(struct device *dev)
> 
> Mark it as __maybe_unused to avoid the warning and let the compiler
> drop it silently.
> 
> Fixes: cd40f6ff124c ("firmware: tegra: bpmp: Implement suspend/resume support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/firmware/tegra/bpmp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
> index 41448ba78be9..a3d5b518c10e 100644
> --- a/drivers/firmware/tegra/bpmp.c
> +++ b/drivers/firmware/tegra/bpmp.c
> @@ -844,7 +844,7 @@ static int tegra_bpmp_probe(struct platform_device *pdev)
>  	return err;
>  }
>  
> -static int tegra_bpmp_resume(struct device *dev)
> +static int __maybe_unused tegra_bpmp_resume(struct device *dev)
>  {
>  	struct tegra_bpmp *bpmp = dev_get_drvdata(dev);
>  	unsigned int i;

Arnd, is this seen with 32-bit ARM configs?

Timo, does it make sense to make BPMP dependent on ARCH_TEGRA_186_SOC
and ARCH_TEGRA_194_SOC instead of just ARCH_TEGRA? For 64-bit Tegra we
have a dependency on PM so this should not be seen for 64-bit Tegra.

Cheers
Jon

-- 
nvpublic