lkml.org 
[lkml]   [2002]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Calculating kernel logical address ..
    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/

    \
     
     \ /
      Last update: 2005-03-22 13:28    [W:0.023 / U:31.960 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site