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Message-ID: <CAMuHMdVewn0OYA9oJfStk0-+vCKAUou+4Mvd5H2kmrSks1p5jg@mail.gmail.com>
Date: Mon, 27 Jun 2022 10:26:37 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Michael Schmitz <schmitzmic@...il.com>
Cc: Arnd Bergmann <arnd@...nel.org>, scsi <linux-scsi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Arnd Bergmann <arnd@...db.de>,
Jakub Kicinski <kuba@...nel.org>,
Christoph Hellwig <hch@...radead.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Robin Murphy <robin.murphy@....com>,
Linux IOMMU <iommu@...ts.linux-foundation.org>,
Khalid Aziz <khalid@...ehiking.org>,
"Maciej W . Rozycki" <macro@...am.me.uk>,
Matt Wang <wwentao@...are.com>,
Miquel van Smoorenburg <mikevs@...all.net>,
Mark Salyzyn <salyzyn@...roid.com>,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
Linux-Arch <linux-arch@...r.kernel.org>,
alpha <linux-alpha@...r.kernel.org>,
linux-m68k <linux-m68k@...ts.linux-m68k.org>,
Parisc List <linux-parisc@...r.kernel.org>,
Denis Efremov <efremov@...ux.com>,
Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS
Hi Michael,
On Sat, Jun 18, 2022 at 3:06 AM Michael Schmitz <schmitzmic@...il.com> wrote:
> Am 18.06.2022 um 00:57 schrieb Arnd Bergmann:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > 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@...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
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