linux-kernel - Re: [PATCH] soc: qcom: smem: use correct format characters

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Date:   Fri, 18 Mar 2022 11:02:46 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Bill Wendling <morbo@...gle.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] soc: qcom: smem: use correct format characters

On Wed, Mar 16, 2022 at 02:31:18PM -0700, Bill Wendling wrote:
> When compiling with -Wformat, clang emits the following warnings:
> 
> drivers/soc/qcom/smem.c:847:41: warning: format specifies type 'unsigned
> short' but the argument has type 'unsigned int' [-Wformat]
>                         dev_err(smem->dev, "bad host %hu\n", remote_host);
>                                                      ~~~     ^~~~~~~~~~~
>                                                      %u
> ./include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err'
>         dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
>                                                                ~~~     ^~~~~~~~~~~
> ./include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
>                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
>                              ~~~    ^~~~~~~~~~~
> drivers/soc/qcom/smem.c:852:47: warning: format specifies type 'unsigned
> short' but the argument has type 'unsigned int' [-Wformat]
>                         dev_err(smem->dev, "duplicate host %hu\n", remote_host);
>                                                            ~~~     ^~~~~~~~~~~
>                                                            %u
> ./include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err'
>         dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
>                                                                ~~~     ^~~~~~~~~~~
> ./include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
>                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
>                              ~~~    ^~~~~~~~~~~
> 
> The types of these arguments are unconditionally defined, so this patch
> updates the format character to the correct ones for ints and unsigned
> ints.

Right. Alternatively, remote_host could be turned into a u16 to match
host0 and host1, as those are the only values that will ever be assigned
to it, which should have been done in commit 13a920ae7898 ("soc: qcom:
smem: a few last cleanups") to avoid introducing this warning in the
first place.

Probably does not matter though, unless the maintainers feel that is a
better fix.

> Link: ClangBuiltLinux/linux#378

Link: https://github.com/ClangBuiltLinux/linux/issues/378

as discussed on other patches :)

> Signed-off-by: Bill Wendling <morbo@...gle.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  drivers/soc/qcom/smem.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index e2057d8f1eff..a98b5f395d15 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -844,12 +844,12 @@ qcom_smem_enumerate_partitions(struct qcom_smem *smem, u16 local_host)
>  			continue;
>  
>  		if (remote_host >= SMEM_HOST_COUNT) {
> -			dev_err(smem->dev, "bad host %hu\n", remote_host);
> +			dev_err(smem->dev, "bad host %u\n", remote_host);
>  			return -EINVAL;
>  		}
>  
>  		if (smem->partitions[remote_host]) {
> -			dev_err(smem->dev, "duplicate host %hu\n", remote_host);
> +			dev_err(smem->dev, "duplicate host %u\n", remote_host);
>  			return -EINVAL;
>  		}
>  
> -- 
> 2.35.1.723.g4982287a31-goog
> 
>