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

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Message-ID: <CAGG=3QUXDj1Bp1kDY2F0dqw=6f8iRqE4nRDyticUrWx-nTb-=A@mail.gmail.com>
Date:   Fri, 18 Mar 2022 11:27:36 -0700
From:   Bill Wendling <morbo@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-msm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] soc: qcom: smem: use correct format characters

On Fri, Mar 18, 2022 at 11:02 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> 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.
>
I'll be happy to redo the patch if the maintainers wish. :-)

> 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 :)
>
Thanks! Copy-and-paste strikes again...

-bw

> > 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
> >
> >