linux-kernel - Re: [PATCH v4 2/2] thermal: uniphier: add UniPhier thermal driver

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Date:   Fri, 21 Jul 2017 20:15:03 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     rui.zhang@...el.com, Eduardo Valentin <edubezval@...il.com>,
        linux-pm@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH v4 2/2] thermal: uniphier: add UniPhier thermal driver

On Fri, 21 Jul 2017 02:09:18 +0900 <yamada.masahiro@...ionext.com> wrote:

> 2017-07-21 1:53 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> > 2017-07-21 1:08 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> >> 2017-07-07 10:54 GMT+09:00 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>:
> >>> Add a thermal driver for on-chip PVT (Process, Voltage and Temperature)
> >>> monitoring unit implemented on UniPhier SoCs. This driver supports
> >>> temperature monitoring and alert function.
> >>>
> >>> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> >>
> >>
> >> Sparse reports several warnings.
> >>
> >>
> >>   CHECK   drivers/thermal/uniphier_thermal.c
> >> drivers/thermal/uniphier_thermal.c:276:52: warning: incorrect type in
> >> argument 1 (different base types)
> >> drivers/thermal/uniphier_thermal.c:276:52:    expected restricted
> >> __be32 const [usertype] *cell
> >> drivers/thermal/uniphier_thermal.c:276:52:    got unsigned int const
> >> [usertype] *[assigned] calib
> >> drivers/thermal/uniphier_thermal.c:277:58: warning: incorrect type in
> >> argument 1 (different base types)
> >> drivers/thermal/uniphier_thermal.c:277:58:    expected restricted
> >> __be32 const [usertype] *cell
> >> drivers/thermal/uniphier_thermal.c:277:58:    got unsigned int const
> >> [usertype] *
> >> drivers/thermal/uniphier_thermal.c:136:9: warning: cast truncates bits
> >> from constant value (fffffffff becomes ffffffff)
> >> drivers/thermal/uniphier_thermal.c:141:9: warning: cast truncates bits
> >> from constant value (7ffffffff becomes ffffffff)
> >> drivers/thermal/uniphier_thermal.c:153:9: warning: cast truncates bits
> >> from constant value (ffffffffff0001 becomes ffff0001)
> >> drivers/thermal/uniphier_thermal.c:170:9: warning: cast truncates bits
> >> from constant value (7ffffffffff becomes ffffffff)
> >> drivers/thermal/uniphier_thermal.c:185:9: warning: cast truncates bits
> >> from constant value (7ffffffffff becomes ffffffff)
> >>
> >
> > Hmm.
> > The endian mismatch can be fixed by replacing u32 with __be32.
> >
> > I can not get the truncates bits warnings.
> > Why sparse complains about this...
> 
> My bad - I was cross-compiling with ARCH=arm, so I think that's why.
> 
> I think the incorrect type should be fixed.  (u32 -> __be32)

Thanks for your pointing out.
I'll fix it next.

Best Regards,
Kunihiko Hayashi