linux-kernel - Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO

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Date:   Tue, 28 Jun 2022 09:12:33 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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 Geert,

On 27/06/22 20:26, Geert Uytterhoeven wrote:
> 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().

Thanks! From what I see, it doesn't have to deal with bounce buffers 
though?

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