linux-kernel - Re: [PATCH] asm-generic: architecture independent readq/writeq for 32bit environment

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Message-ID: <CAMO-S2gdp-GUsJz05hkQbesmwsZUSja4b8KLwYytMYq2kYRymA@mail.gmail.com>
Date:	Thu, 16 Feb 2012 13:39:00 +0900
From:	Hitoshi Mitake <h.mitake@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	Kashyap Desai <Kashyap.Desai@....com>,
	Len Brown <lenb@...nel.org>,
	Ravi Anand <ravi.anand@...gic.com>,
	Vikas Chaudhary <vikas.chaudhary@...gic.com>,
	Matthew Garrett <mjg@...hat.com>,
	Jason Uhlenkott <juhlenko@...mai.com>,
	James Bottomley <James.Bottomley@...allels.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Roland Dreier <roland@...estorage.com>,
	James Bottomley <jbottomley@...allels.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] asm-generic: architecture independent readq/writeq for
 32bit environment

On Thu, Feb 9, 2012 at 23:45, H. Peter Anvin <hpa@...or.com> wrote:
> On 02/09/2012 05:37 AM, Hitoshi Mitake wrote:
>>
>> On Tue, Feb 7, 2012 at 12:47, hpanvin@...il.com<hpa@...or.com>  wrote:
>>>
>>> Should be volatile u64 * not volatile void *...
>>
>>
>> Is this the type of parameters?
>> The parameters of atomic readq/writeq defined in arch/x86/include/asm/io.h
>> are defined as void *. I think that atomic readq/writeq and non-atomic
>> readq/writeq
>> should have same typed parameters and return values.
>>
>
> That sounds like a bug.
>
>        -hpa
>

Sorry for my bad writing, I didn't mention:
the parameter type == the return value type

My intention is:
parameter type of atomic readq/writeq == parameter type of non-atomic
readq/writeq
&&
return value type of atomic readq/writeq == return value type of
non-atomic readq/writeq

# == means "should be equal"

-- 
Hitoshi Mitake
h.mitake@...il.com
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