linux-kernel - Re: Opinion on ordering of writel vs. stores to RAM

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Message-Id: <1157926993.23085.29.camel@localhost.localdomain>
Date:	Sun, 10 Sep 2006 23:23:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	David Miller <davem@...emloft.net>, jeff@...zik.org,
	paulus@...ba.org, torvalds@...l.org, linux-kernel@...r.kernel.org,
	akpm@...l.org, segher@...nel.crashing.org
Subject: Re: Opinion on ordering of writel vs. stores to RAM

Ar Llu, 2006-09-11 am 07:25 +1000, ysgrifennodd Benjamin Herrenschmidt:
> I'm copying that from a private discussion I had. Please let me know if
> you have comments. This proposal includes some questions too so please
> answer :)

Looks sane and Linus seems to like mmiowb. Only other question: what are
the guarantees of memcpy_to/fromio. Does it access the memory in ordered
fashion or not, does it guarantee only ordering at the end of the copy
or during it ?

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