Messages in this thread |  | | Date | Mon, 30 Oct 2000 19:17:12 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH] kiobuf/rawio fixes for 2.4.0-test10-pre6 |
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On Mon, Oct 30, 2000 at 12:19:21PM -0500, Jeff Garzik wrote: > Christoph Hellwig wrote: > > +Locking down user memory and doing mass storage device IO with it is not > > +the only purpose of kiobufs. Another use for kiobufs is allowing > > +user-space mmaping dma memory, e.g in sound drivers. To do so you > > +need to lock-down kernel virtual memory and refernece it using kiobufs. > > +The code that does exactly this is not yet in the kernel - get Stephen > > +Tweedie's kiobuf patchset if you want to use this. > > Take a look at drivers/sound/via82cxxx_audio.c. How can that mmap be > improved by using kiobufs?
I think so - but you need Stephen's kvmap patch, that is in the same patchset the forward-ported fixes are (at ftp://ftp.linux.org.uk/pub/linux/sct/fs/raw-io/)
An very nice example is included.
Christoph
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