On Sat, 6 Oct 2018 06:29:51 -0700
Matthew Wilcox [off-list ref] wrote:

I had an informal chat with Bradley Kuhn at LinuxCon Japan about using
CC-BY-SA-4.0 and he indicated that I was probably better off using the
GPL-2(+) for documentation.  I've changed the XArray documentation from
CC-BY-SA-4.0 to GPL-2+.

Would you consider doing the same for Documentation/core-api/idr.rst?
That's the only CC-SA SPDX tag in the kernel now, and it's a clear
example of just what I'm worried about: it pulls in a nice DOC section
from the code when you run Sphinx on it, so we're not just talking
function prototypes here.  I was likely to come knocking on your door
after my upcoming conversation anyway...:)

Thanks,

jon