From: Roland Dreier <rdreier@cisco.com>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: akepner@sgi.com, Andrew Morton <akpm@linux-foundation.org>,
grundler@parisc-linux.org, jbarnes@virtuousgeek.org, jes@sgi.com,
randy.dunlap@oracle.com, James.Bottomley@steeleye.com,
davem@davemloft.net, linux-kernel@vger.kernel.org
Subject: Re: [RFC] dma: passing "attributes" to dma_map_* routines
Date: Tue, 18 Dec 2007 13:09:49 -0800 [thread overview]
Message-ID: <adar6hj1zhe.fsf@cisco.com> (raw)
In-Reply-To: <476834AC.9050401@s5r6.in-berlin.de> (Stefan Richter's message of "Tue, 18 Dec 2007 21:59:24 +0100")
> However, your older patch series looks like you want this behavior also
> in areas which are mapped by dma_map_sg(), do you?. Still, adding two
> functions of the kind like above, if necessary, might still be
> preferable to changing the call parameters of existing functions or to
> overloading enum dma_data_direction.
Yes, the _sg variants are needed, because we want to map userspace
regions with this attribute and there's of course no guarantee that
userspace memory is contiguous.
- R.
next prev parent reply other threads:[~2007-12-18 21:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-18 0:17 [RFC] dma: passing "attributes" to dma_map_* routines akepner
2007-12-18 16:50 ` Stefan Richter
2007-12-18 19:04 ` Roland Dreier
2007-12-18 20:07 ` akepner
2007-12-18 20:59 ` Stefan Richter
2007-12-18 21:09 ` Roland Dreier [this message]
2007-12-20 18:51 ` akepner
2007-12-20 19:06 ` akepner
2007-12-20 20:56 ` Benjamin Herrenschmidt
2007-12-21 18:00 ` akepner
2007-12-21 20:24 ` Stefan Richter
2007-12-21 21:31 ` Benjamin Herrenschmidt
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