Messages in this thread |  | | Date | Mon, 09 Sep 2002 11:42:07 -0700 | From | Andrew Morton <> | Subject | Re: Calculating kernel logical address .. |
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Jesse Barnes wrote: > > On Mon, Sep 09, 2002 at 02:00:35PM -0400, Richard B. Johnson wrote: > > Well I just read Documentation/DMA-mapping.txt as advised by David > > and it seems as though it will no longer be possible to do what > > many programmers have been wanting to do, to wit: > > > > (1) In user-code, allocate a buffer. > > (2) Lock that buffer into memory. > > (3) Call some driver that DMAs data to/from that buffer. > > It looks drivers/media/video/video-buf.c uses alloc_kiovec() and > map_user_kiobuf() to do it.
For video-buf.c and for Imran's application, that's just a wrapper which is used to get at get_user_pages().
It would be best to not use the kiobuf code please - its future is up in the air. Just use get_user_pages() directly for now. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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