I like the series a lot.
Superficial comments:
for nds32 is there any good reason why __get_user / __set_user check
the address limit directly? Maybe we should unify this and make it work
like the other architectures.
With "uaccess: add generic __{get,put}_kernel_nofault" we should be able
to remove HAVE_GET_KERNEL_NOFAULT entirely and just check if the helpers
are already defined in linux/uaccess.h.
The new generic __access_ok, and the 3 fixed up version early on
have a whole lot of superflous braces.
