Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS

[Geert Uytterhoeven]

Hi Michael,

On Sat, Jun 18, 2022 at 3:06 AM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
> Am 18.06.2022 um 00:57 schrieb Arnd Bergmann:
> > From: Arnd Bergmann <arnd@xxxxxxxx>
> >
> > All architecture-independent users of virt_to_bus() and bus_to_virt()
> > have been fixed to use the dma mapping interfaces or have been
> > removed now.  This means the definitions on most architectures, and the
> > CONFIG_VIRT_TO_BUS symbol are now obsolete and can be removed.
> >
> > The only exceptions to this are a few network and scsi drivers for m68k
> > Amiga and VME machines and ppc32 Macintosh. These drivers work correctly
> > with the old interfaces and are probably not worth changing.
>
> The Amiga SCSI drivers are all old WD33C93 ones, and replacing
> virt_to_bus by virt_to_phys in the dma_setup() function there would
> cause no functional change at all.

FTR, the sgiwd93 driver use dma_map_single().

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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