On Thu 11 October 2012 13:36:45 Hans Verkuil wrote:

On Thu 11 October 2012 13:34:07 Alan Cox wrote:

quoted

quoted

The whole purpose of this API is to let DRM and V4L drivers share buffers for
zero-copy pipelines. Unfortunately it is a fact that several popular DRM drivers
are closed source. So we have a choice between keeping the export symbols GPL
and forcing those closed-source drivers to make their own incompatible API,
thus defeating the whole point of DMABUF, or using EXPORT_SYMBOL and letting
the closed source vendors worry about the legality. They are already using such
functions (at least nvidia is), so they clearly accept that risk.

Then they can accept the risk of ignoring EXPORT_SYMBOL_GPL and
calling into it anyway can't they. Your argument makes no rational sense
of any kind.

Out of curiosity: why do we have both an EXPORT_SYMBOL and an EXPORT_SYMBOL_GPL
if there is no legal difference?

And if there is a difference between the two, then what is it?

Answering myself:

http://lwn.net/Articles/154602/