Christophe Leroy [off-list ref] writes:

This patch implements a framework for Kernel Userspace Access
Protection.

Then subarches will have to possibility to provide their own
implementation by providing setup_kuap() and lock/unlock_user_access()

Some platform will need to know the area accessed and whether it is
accessed from read, write or both. Therefore source, destination and
size and handed over to the two functions.

Signed-off-by: Christophe Leroy <redacted>

I think some of this code came from Russell's original patch?

In which case we should have his signed-off-by here.

cheers