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References: <20230105094039.1474255-1-xurui@kylinos.cn> <CAMuHMdX174erGgrCUBv2WdX67H=mig-hi=SOdeMJ=0__thC_fw@mail.gmail.com>
In-Reply-To: <CAMuHMdX174erGgrCUBv2WdX67H=mig-hi=SOdeMJ=0__thC_fw@mail.gmail.com>
From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Mon, 9 Jan 2023 11:04:16 +0100
Message-ID: <CAMuHMdVdCBxZ39BbtLDPeiMK9BK4M0W5hynrYLFx6+ibunyxGw@mail.gmail.com>
Subject: Re: [PATCH] fbdev/g364fb: Fix a compilation issue
To:     xurui <xurui@kylinos.cn>
Cc:     deller@gmx.de, linux-fbdev@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        trivial@kernel.org, linux-mips@vger.kernel.org
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This time with the new linux-mips mailing list address...

On Mon, Jan 9, 2023 at 11:01 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Xurui,
>
> On Thu, Jan 5, 2023 at 10:45 AM xurui <xurui@kylinos.cn> wrote:
> > drivers/video/fbdev/g364fb.c:202:4: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> >
> > Signed-off-by: xurui <xurui@kylinos.cn>
>
> Thanks for your patch!
>
> > --- a/drivers/video/fbdev/g364fb.c
> > +++ b/drivers/video/fbdev/g364fb.c
> > @@ -175,7 +175,8 @@ int __init g364fb_init(void)
> >  {
> >         volatile unsigned int *curs_pal_ptr =
> >             (volatile unsigned int *) CURS_PAL_REG;
> > -       int mem, i;
> > +       int mem;
> > +       uintptr_t i;
>
> This doesn't look like the right fix to me.
>
> The line the compiler[1] complains about is:
>
>                 *(unsigned short *) (CURS_PAT_REG + i * 8) = 0;
>
> Interestingly, it doesn't complain about:
>
>         *(unsigned short *) (CURS_PAT_REG + 14 * 64) = 0xffff;
>
> This driver uses raw memory writes to write to hardware registers.
> Probably it should use writel() instead.
>
> [1] mips64-linux-gnuabi64-gcc version 10.3.0 (Ubuntu 10.3.0-1ubuntu1)
>     jazz_defconfig + CONFIG_64BIT=y
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds