Messages in this thread | | | From | Daniel Phillips <> | Subject | Re: Calculating kernel logical address .. | Date | Mon, 9 Sep 2002 20:25:56 +0200 |
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On Monday 09 September 2002 20:13, 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. And I think Ben LaHaise was talking about > removing these functions and creating some other, lightweight > interface for the same purpose?
Hopefully. My understanding is that kio is obsoleted by bio and aio, anyone want to confirm/deny this?
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