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From: Arnd Bergmann <arnd@arndb.de>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Rich Felker <dalias@libc.org>, Jiri Slaby <jirislaby@gmail.com>,
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Subject: Re: [RFT 00/13] iomap: Constify ioreadX() iomem argument
Date: Wed, 8 Jan 2020 12:55:39 +0100
Message-ID: <CAK8P3a19ZgLhKJ016Mt_FyZrqnKaWwJyiaauMiUDAHV=DB9_2w@mail.gmail.com> (raw)
In-Reply-To: <20200108091549.GB10145@pi3>

On Wed, Jan 8, 2020 at 10:15 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:

> > The __force-cast that removes the __iomem here also means that
> > the 'volatile' keyword could be dropped from the argument list,
> > as it has no real effect any more, but then there are a few drivers
> > that mark their iomem pointers as either 'volatile void __iomem*' or
> > (worse) 'volatile void *', so we keep it in the argument list to not
> > add warnings for those drivers.
> >
> > It may be time to change these drivers to not use volatile for __iomem
> > pointers, but that seems out of scope for what Krzysztof is trying
> > to do. Ideally we would be consistent here though, either using volatile
> > all the time or never.
>
> Indeed. I guess there are no objections around const so let me send v2
> for const only.

Ok, sounds good. Maybe mention in the changelog then that the
'volatile' in the interface is intentionally left out, and that only users
of readl/writel still have it to deal with existing drivers.

    Arnd

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Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-07 16:52 Krzysztof Kozlowski
2020-01-07 16:52 ` [RFT 01/13] iomap: Constify ioreadX() iomem argument (as in generic implementation) Krzysztof Kozlowski
2020-01-07 16:52 ` [RFT 02/13] alpha: " Krzysztof Kozlowski
2020-01-08  8:10   ` Geert Uytterhoeven
2020-01-08  9:07     ` Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 02/13] sh: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 03/13] alpha: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 03/13] sh: " Krzysztof Kozlowski
2020-01-07 17:08   ` Arnd Bergmann
2020-01-07 16:53 ` [RFT 04/13] parisc: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 05/13] powerpc: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 06/13] arc: " Krzysztof Kozlowski
2020-01-07 17:10   ` Arnd Bergmann
2020-01-07 16:53 ` [RFT 07/13] drm/mgag200: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 08/13] drm/nouveau: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 09/13] media: fsl-viu: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 10/13] net: wireless: ath5k: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 11/13] net: wireless: rtl818x: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 12/13] ntb: intel: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 13/13] virtio: pci: " Krzysztof Kozlowski
2020-01-08  8:07 ` [RFT 00/13] iomap: Constify ioreadX() iomem argument Geert Uytterhoeven
2020-01-08  8:12   ` Geert Uytterhoeven
2020-01-08  8:18     ` Krzysztof Kozlowski
2020-01-08  8:35       ` Christophe Leroy
2020-01-08  8:43         ` Geert Uytterhoeven
2020-01-08  8:48           ` Christophe Leroy
2020-01-08 17:39             ` David Laight
2020-01-08  8:44         ` Arnd Bergmann
2020-01-08  9:15           ` Krzysztof Kozlowski
2020-01-08 11:55             ` Arnd Bergmann [this message]
2020-01-08  8:15   ` Krzysztof Kozlowski

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