linux-kernel - Memory-mapped I/O barriers, state of affairs?

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Date:	Mon, 22 Mar 2010 20:18:49 +0100
From:	Leon Woestenberg <leon.woestenberg@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Memory-mapped I/O barriers, state of affairs?

Hello,

searching for good info on device IO racing against host memory writes
I came upon this 2006 article:

http://lwn.net/Articles/198988/

"there is no guaranteed ordering between writes to regular memory and
writes to a memory-mapped I/O range. "

What is the current solution for that particular problem, i.e. how
should I make sure host memory writes are committed before I have an
external DMA device act on it?

Thanks,
-- 
Leon Woestenberg.
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