Re: clean up and streamline probe_kernel_* and friends v2

On Wed, May 13, 2020 at 9:00 AM Christoph Hellwig [off-list ref] wrote:

this series start cleaning up the safe kernel and user memory probing
helpers in mm/maccess.c, and then allows architectures to implement
the kernel probing without overriding the address space limit and
temporarily allowing access to user memory.  It then switches x86
over to this new mechanism by reusing the unsafe_* uaccess logic.

Ok, I think I found a bug, and I had one more suggestion, but other
than the two emails I sent this all looks like an improvement to me.

                 Linus