From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Hitoshi Mitake <h.mitake@gmail.com>,
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, hpa@linux.intel.com
Subject: Re: [PATCH] NVMe: Fix compilation on architecturs without readq/writeq
Date: Wed, 1 Feb 2012 15:35:41 -0800 [thread overview]
Message-ID: <CA+55aFw4F-02NxbQHmpy0KtXxKc9++HutgVXd7nGe0G7NqG+Gw@mail.gmail.com> (raw)
In-Reply-To: <20120131122339.GG32010@elte.hu>
On Tue, Jan 31, 2012 at 4:23 AM, Ingo Molnar <mingo@elte.hu> wrote:
>
> non-atomic sounds good to me too.
You both apparently missed the related discussion that some devices
really do care about order, even if they don't care about atomicity.
So we'd actually have two versions of the header file, one
little-endian, and one big-endian. Then the driver that knows it
doesn't need the atomic 'readq()' that is always defined, but wants a
low-bytes-first version would just do
#include <linux/io64-little-endian.h>
(or "big-endian" if it wants to read/write high bits first). Most
drivers probably don't care, but apparently NVMe does.
Linus
next prev parent reply other threads:[~2012-02-01 23:36 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
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 [this message]
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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