linux-kernel - Re: [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist transfers

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Message-ID: <AANLkTimzdEhAZ=oXbbB3Ge5=YY7OXq3fjaRH4roPNB-k@mail.gmail.com>
Date:	Mon, 27 Sep 2010 17:23:34 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	linuxppc-dev@...ts.ozlabs.org,
	Per Fridén <per.friden@...ricsson.com>
Subject: Re: [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to
 scatterlist transfers

2010/9/25 Ira W. Snyder <iws@...o.caltech.edu>:

> This adds support for scatterlist to scatterlist DMA transfers.

This is a good idea, we have a local function to do this in DMA40 already,
stedma40_memcpy_sg().

> This is
> currently hidden behind a configuration option, which will allow drivers
> which need this functionality to select it individually.

Why? Isn't it better to add this as a new capability flag
if you don't want to announce it? Or is the intent to save
memory footprint?

Yours,
Linus Walleij
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