linux-kernel - Re: [PATCH] soc: sof: fix clang -Wformat warnings

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Message-ID: <YumINAZ4WaM4rG7Q@dev-arch.thelio-3990X>
Date:   Tue, 2 Aug 2022 13:25:24 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Tom Rix <trix@...hat.com>,
        sound-open-firmware@...a-project.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] soc: sof: fix clang -Wformat warnings

Hi all,

On Thu, Jul 21, 2022 at 02:12:18PM -0700, Justin Stitt wrote:
> When building with Clang we encounter these warnings:
> | sound/soc/sof/ipc3-topology.c:2343:4: error: format specifies type
> | 'unsigned char' but the argument has type 'int' [-Werror,-Wformat]
> |                  SOF_ABI_MAJOR, SOF_ABI_MINOR, SOF_ABI_PATCH);
> |                  ^~~~~~~~~~~~~~~^~~~~~~~~~~~~~~^~~~~~~~~~~~~
> 
> Use correct format specifier `%d` since args are of type int.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/378
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Suggested-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> ---
> Reported by Nathan here:
> https://lore.kernel.org/all/YtmrCJjQrSbv8Aj1@dev-arch.thelio-3990X/
> 
>  sound/soc/sof/ipc3-topology.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/soc/sof/ipc3-topology.c b/sound/soc/sof/ipc3-topology.c
> index b2cc046b9f60..65923e7a5976 100644
> --- a/sound/soc/sof/ipc3-topology.c
> +++ b/sound/soc/sof/ipc3-topology.c
> @@ -2338,7 +2338,7 @@ static int sof_ipc3_parse_manifest(struct snd_soc_component *scomp, int index,
>  	}
>  
>  	dev_info(scomp->dev,
> -		 "Topology: ABI %d:%d:%d Kernel ABI %hhu:%hhu:%hhu\n",
> +		 "Topology: ABI %d:%d:%d Kernel ABI %d:%d:%d\n",
>  		 man->priv.data[0], man->priv.data[1], man->priv.data[2],
>  		 SOF_ABI_MAJOR, SOF_ABI_MINOR, SOF_ABI_PATCH);
>  
> -- 
> 2.37.1.359.gd136c6c3e2-goog
> 
> 

Is it too late for this patch to make 6.0? We are trying to enable
-Wformat for clang in 6.0 and this instance of that warning was
introduced this development cycle by commit 323aa1f093e6 ("ASoC: SOF:
Add a new IPC op for parsing topology manifest"). If I am tracking all
my patches correctly, this is the only instance of -Wformat that does
not have a patch applied to a maintainer's tree so it would be really
unfortunate if we could not sure it on for -rc1.

We could probably route this via the Kbuild tree with an Ack along with
the patch that enables -Wformat if it cannot go via Mark's or Takashi's
ree.

Cheers,
Nathan