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

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Message-ID: <CAMuHMdXfFtn9b_2d5BQdzeyMH_puKJ8tzQeLu-Cw4dxfovcb5w@mail.gmail.com>
Date:   Thu, 25 Nov 2021 08:33:30 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Michael Schmitz <schmitzmic@...il.com>
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 Michael,

On Wed, Nov 24, 2021 at 9:50 PM Michael Schmitz <schmitzmic@...il.com> wrote:
> 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).

The raw_ IO functions do not require that: you can pass a void *
to a function that expects a different pointer type.

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