linux-kernel - Re: [PATCH 0/4] iomap: fix multiple consistency issues, interface cleanup

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Date:   Mon, 18 Feb 2019 15:11:54 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Hugo Lefeuvre <hle@....eu.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] iomap: fix multiple consistency issues, interface cleanup

On Mon, Feb 18, 2019 at 11:53 AM Hugo Lefeuvre <hle@....eu.com> wrote:
>
> Hi,
>
> This patch cleans up the iomap interface.
>
> The first patch makes the include/asm-generic/iomap.h header compliant
> with the kernel style guidelines by adding missing function args
> identifier names.
>
> The second and fourth patches address multiple compilation warnings due
> to missing const qualifiers in mmio_ins* and ioread*/iowrite
> definitions in include/asm-generic/iomap.h and lib/iomap.c.
>
> The third patch modifies io*_rep definitions from asm-generic/io.h to
> take unsigned long count parameter instead of unsigned int which is
> inconsistent with other definitions in the kernel.

Nice cleanup! Applied to my asm-generic tree now.

I notice that you did not add a 'volatile' qualifier in addition to 'const'.
Is that something you considered doing? I think the traditional
readl/writel style accessors have them partly for historic reasons,
and partly to simply the trivial implementation that is based on
a volatile pointer dereference. Neither is needed here, and I don't
think we have any drivers that pass volatile pointers into ioread()/iowrite()
(which would cause a warning), so we can probably leave it at that,
but it's still a bit inconsistent.

    Arnd