linux-kernel - Re: [PATCH] pata_falcon: Add missing _

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Message-ID: <CAOmrzkJhXvN0gOU8fc5jNu3Q9LnT4dgCGdrznYbCbGXxq0dJpQ@mail.gmail.com>
Date:   Thu, 25 Nov 2021 09:50:35 +1300
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Finn Thain <fthain@...ux-m68k.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, linux-ide@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pata_falcon: Add missing __iomem annotations

Hi Geert,

On Wed, Nov 24, 2021 at 8:51 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > --- a/drivers/ata/pata_falcon.c
> > +++ b/drivers/ata/pata_falcon.c
> > @@ -55,14 +55,14 @@ static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
> >         /* Transfer multiple of 2 bytes */
> >         if (rw == READ) {
> >                 if (swap)
> > -                       raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
> > +                       raw_insw_swapw((u16 __iomem *)data_addr, (u16 *)buf, words);
> >                 else
> > -                       raw_insw((u16 *)data_addr, (u16 *)buf, words);
> > +                       raw_insw((u16 __iomem *)data_addr, (u16 *)buf, words);
> >         } else {
> >                 if (swap)
> > -                       raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
> > +                       raw_outsw_swapw((u16 __iomem *)data_addr, (u16 *)buf, words);
> >                 else
> > -                       raw_outsw((u16 *)data_addr, (u16 *)buf, words);
> > +                       raw_outsw((u16 __iomem *)data_addr, (u16 *)buf, words);
>
> Can't you just drop the casts? data_addr is an __iomem void *.

It's not u16 though, and the raw_ IO functions require that. But we
could cast data_addr as __iomem u16 * (compile tested).

Cheers,

    Michael

>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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