linux-kernel - Re: [PATCH] arch: m32r: include: asm: add ioread*_rep() and iowrite*

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Message-ID: <CAMuHMdX=n4y9o4qBU2jouH0aJP1BcJrgAKZFfgVTBTymWFB=6Q@mail.gmail.com>
Date:	Thu, 27 Jun 2013 10:43:46 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Chen Gang <gang.chen@...anux.com>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] arch: m32r: include: asm: add ioread*_rep() and iowrite*_rep()

On Thu, Jun 27, 2013 at 10:25 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Thursday 27 June 2013 09:07:29 Geert Uytterhoeven wrote:
>> On Thu, Jun 27, 2013 at 6:37 AM, Chen Gang <gang.chen@...anux.com> wrote:
>> > --- a/arch/m32r/include/asm/io.h
>> > +++ b/arch/m32r/include/asm/io.h
>> > @@ -169,6 +169,20 @@ static inline void _writel(unsigned long l, unsigned long addr)
>> >  #define iowrite16 writew
>> >  #define iowrite32 writel
>> >
>> > +#define ioread8_rep(p, dst, count) \
>> > +       insb((unsigned long) (p), (dst), (count))
>>
>> As ioread8() is mapped to readb() (I/O memory space), not inb() (I/O
>> port space),
>> ioread8_rep() should map to readsb() (which m32r doesn't have yet
>> BTW), not insb().
>> For m32r this does matter, as inb() and readb() use different mechanisms
>> internally.
>>
>> It seems include/asm-generic/io.h also has this wrong?
>
> Yes, you are right. I thought we had fixed that long ago.
>
> Does the patch below look ok to you? Note that none of the architectures
> using asm-generic/io.h supports PIO access and it works by chance
> this way, but we should definitely fix it.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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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