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

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Message-ID: <CAMO-S2i8Z7q2NQN4WDwvwjrNAoe2uFKhFcfpLb4gRHoZtiynzQ@mail.gmail.com>
Date:	Thu, 9 Feb 2012 01:14:39 +0900
From:	Hitoshi Mitake <h.mitake@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Roland Dreier <roland@...estorage.com>,
	Matthew Garrett <mjg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Bottomley <James.Bottomley@...allels.com>,
	Ravi Anand <ravi.anand@...gic.com>,
	James Bottomley <jbottomley@...allels.com>,
	Len Brown <lenb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Uhlenkott <juhlenko@...mai.com>,
	Kashyap Desai <Kashyap.Desai@....com>,
	linux-kernel@...r.kernel.org,
	Vikas Chaudhary <vikas.chaudhary@...gic.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>, mingo@...e.hu
Subject: Re: [PATCH] asm-generic: architecture independent readq/writeq for
 32bit environment

On Tue, Feb 7, 2012 at 12:56, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Feb 6, 2012 6:47 PM, "Hitoshi Mitake" <h.mitake@...il.com> wrote:
>>
>>  All of them are endian aware
>
> I think that part is wrong.
>
> Pci is little-endian, so readl and writel are always already little-endian.
> Trying to make readq be endian-aware is wrong.

Is every memory area which can be read/written by read[wl]/write[wl]
always little-endian?

If so, of course I have to eliminate the big-endian version.
But I'm not sure about this point because the new readq/writeq is
in asm-generic which is used by every archs, so I'd like to ask you about it.

>
>                           Linus
>
> On Feb 6, 2012 6:47 PM, "Hitoshi Mitake" <h.mitake@...il.com> wrote:



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