linux-kernel - Re: [PATCH] hwrng: omap3-rom - Fix unused function warnings

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Date:   Wed, 23 Oct 2019 15:14:52 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Adam Ford <aford173@...il.com>,
        Pali Rohár <pali.rohar@...il.com>,
        Tero Kristo <t-kristo@...com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh@...nel.org>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwrng: omap3-rom - Fix unused function warnings

Hi,

On Tue, Oct 22, 2019 at 04:27:31PM +0200, Arnd Bergmann wrote:
> When runtime-pm is disabled, we get a few harmless warnings:
> 
> drivers/char/hw_random/omap3-rom-rng.c:65:12: error: unused function 'omap_rom_rng_runtime_suspend' [-Werror,-Wunused-function]
> drivers/char/hw_random/omap3-rom-rng.c:81:12: error: unused function 'omap_rom_rng_runtime_resume' [-Werror,-Wunused-function]
> 
> Mark these functions as __maybe_unused so gcc can drop them
> silently.
> 
> Fixes: 8d9d4bdc495f ("hwrng: omap3-rom - Use runtime PM instead of custom functions")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

>  drivers/char/hw_random/omap3-rom-rng.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/hw_random/omap3-rom-rng.c b/drivers/char/hw_random/omap3-rom-rng.c
> index 0b90983c95c8..e08a8887e718 100644
> --- a/drivers/char/hw_random/omap3-rom-rng.c
> +++ b/drivers/char/hw_random/omap3-rom-rng.c
> @@ -62,7 +62,7 @@ static int omap3_rom_rng_read(struct hwrng *rng, void *data, size_t max, bool w)
>  	return r;
>  }
>  
> -static int omap_rom_rng_runtime_suspend(struct device *dev)
> +static int __maybe_unused omap_rom_rng_runtime_suspend(struct device *dev)
>  {
>  	struct omap_rom_rng *ddata;
>  	int r;
> @@ -78,7 +78,7 @@ static int omap_rom_rng_runtime_suspend(struct device *dev)
>  	return 0;
>  }
>  
> -static int omap_rom_rng_runtime_resume(struct device *dev)
> +static int __maybe_unused omap_rom_rng_runtime_resume(struct device *dev)
>  {
>  	struct omap_rom_rng *ddata;
>  	int r;
> -- 
> 2.20.0
> 

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