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    Subject[PATCH 4/4] dma-buf: document fd flags and O_CLOEXEC requirement
    Date
    Otherwise subsystems will get this wrong and end up with and second
    export ioctl with the flag and O_CLOEXEC support added.

    Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    ---
    Documentation/dma-buf-sharing.txt | 5 +++++
    1 files changed, 5 insertions(+), 0 deletions(-)

    diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt
    index 9f3aeef..087e261 100644
    --- a/Documentation/dma-buf-sharing.txt
    +++ b/Documentation/dma-buf-sharing.txt
    @@ -319,6 +319,11 @@ Miscellaneous notes
    - Any exporters or users of the dma-buf buffer sharing framework must have
    a 'select DMA_SHARED_BUFFER' in their respective Kconfigs.

    +- To avoid the wrath of userspace library writers exporting subsystems must have
    + a flag parameter in the ioctl that creates the dma-buf fd which needs to
    + support at least the O_CLOEXEC fd flag. This needs to be passed in the flag
    + parameter of dma_buf_export.
    +
    References:
    [1] struct dma_buf_ops in include/linux/dma-buf.h
    [2] All interfaces mentioned above defined in include/linux/dma-buf.h
    --
    1.7.7.5


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