linux-kernel - Re: [Question about DMA] Consistent memory?

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Message-ID: <20160102103948.GR8644@n2100.arm.linux.org.uk>
Date:	Sat, 2 Jan 2016 10:39:48 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dmaengine@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Vinod Koul <vinod.koul@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Christoph Hellwig <hch@....de>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Question about DMA] Consistent memory?

On Thu, Dec 31, 2015 at 04:50:54PM +0900, Masahiro Yamada wrote:
> Hi.
> 
> I am new to the Linux DMA APIs.
> 
> First, I started by reading Documentation/DMA-API.txt,
> but I am confused with the term "consistent memory".

Just read "coherent memory" instead - the documentation confusingly uses
the two terms to refer to the same thing.  I think there was a patch a
while back to replace "consistent" with "coherent" in this document,
though I'm not sure what happened to it.

I think you have answers to your other points by others in this thread.

Thanks.

-- 
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