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

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Date:	Thu, 27 Jun 2013 16:55:09 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Arnd Bergmann <arnd@...db.de>,
	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 06/27/2013 03:07 PM, 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.
> 

Reasonable, but excuse me, I am not quite familiar with it, can any
other members (or maintainer) to help implement it ?

Thanks firstly.

:-)

> It seems include/asm-generic/io.h also has this wrong?
> 

I think it need improvement, if readsb has been defined, it should use
readsb() instead, or just use insb().

Thank you to provide a good chance to send another generic patch.  ;-)


-- 
Chen Gang
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