linux-kernel - Re: [PATCH] enhanced reimplemented of the kfifo API

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Message-ID: <1263591001.7531.1.camel@wall-e>
Date:	Fri, 15 Jan 2010 22:30:01 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>
Subject: Re: [PATCH] enhanced reimplemented of the kfifo API


> I'm glad to see this example, it really illustrates how to use the new
> DMA functionality of the kfifo API.
> 
> Is there any reason why a very large scatterlist could not be used? I
> have a driver that uses a large scatterlist (~4000 entries, allocated as
> a struct sg_table). I implemented my own copy_from_user() functionality
> into this scatterlist, but I'd love to use the kfifo DMA API instead.
> After filling the scatterlist, I use the usual DMA API's to transfer it
> to my device.
> 

No, but the API will only return max. two entries.

Stefani


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