From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Hitoshi Mitake <h.mitake@gmail.com>, Ingo Molnar <mingo@elte.hu>,
Matthew Wilcox <matthew.r.wilcox@intel.com>,
Roland Dreier <roland@purestorage.com>,
Andrew Morton <akpm@linux-foundation.org>,
James Bottomley <James.Bottomley@parallels.com>,
linux-kernel@vger.kernel.org, linux-nvme@infradead.org
Subject: Re: [PATCH] NVMe: Fix compilation on architecturs without readq/writeq
Date: Mon, 23 Jan 2012 15:04:27 -0800 [thread overview]
Message-ID: <4F1DE77B.50004@linux.intel.com> (raw)
In-Reply-To: <CA+55aFz=KcR5ji3TBHyfAYxFg8PCjXbdLOWf7aXULYHW4pp2kg@mail.gmail.com>
On 01/23/2012 08:57 AM, Linus Torvalds wrote:
> On Mon, Jan 23, 2012 at 8:05 AM, Hitoshi Mitake<h.mitake@gmail.com> wrote:
>>
>> I wrote the patch which adds the new file include/asm-generic/io-nonatomic.h.
>> io-nonatomic.h provides non-atomic version readq()/writeq().
>
> I do wonder if we should do "little-endian" and "big-endian" variations?
>
> Quoting Willy:
>
> "For this particular hardware, it's defined to work if you read the
> low order bits first"
>
> so I think we need make that explicit, and make two include files:
>
> include/asm-generic/io-64b-lo-hi.h
> include/asm-generic/io-64b-hi-lo.h
>
> or something like that. And thus indirectly document these kinds of
> requirements.
>
I would concur with this (and I have suggested exactly this in the past.)
-hpa
next prev parent reply other threads:[~2012-01-23 23:04 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-20 1:01 [PATCH] NVMe: Fix compilation on architecturs without readq/writeq Matthew Wilcox
2012-01-20 1:21 ` Linus Torvalds
2012-01-20 17:43 ` Wilcox, Matthew R
2012-01-21 8:28 ` Ingo Molnar
2012-01-21 15:54 ` Hitoshi Mitake
2012-01-21 16:58 ` Ingo Molnar
2012-01-23 16:05 ` Hitoshi Mitake
2012-01-23 16:57 ` Linus Torvalds
2012-01-23 23:04 ` H. Peter Anvin [this message]
2012-01-29 8:02 ` Hitoshi Mitake
2012-01-31 3:03 ` Linus Torvalds
2012-01-31 3:05 ` Linus Torvalds
2012-02-04 15:25 ` Hitoshi Mitake
2012-01-31 11:58 ` Alan Cox
2012-01-31 12:09 ` Ingo Molnar
2012-01-31 12:18 ` Alan Cox
2012-01-31 12:23 ` Ingo Molnar
2012-02-01 23:35 ` Linus Torvalds
2012-02-02 1:05 ` James Bottomley
2012-02-02 1:15 ` Linus Torvalds
2012-02-02 15:05 ` H. Peter Anvin
2012-02-04 15:39 ` Hitoshi Mitake
2012-02-05 6:53 ` Geert Uytterhoeven
2012-02-05 7:01 ` Hitoshi Mitake
2012-02-04 15:34 ` Hitoshi Mitake
2012-02-07 2:48 ` Hitoshi Mitake
2012-02-04 15:24 ` Hitoshi Mitake
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