[PATCH v2 0/5] arm64: kernel: Add support for User Access Override

On Fri, Feb 05, 2016 at 04:40:54PM +0100, Arnd Bergmann wrote:

* Do we expect to handle this using live patching indefinitely? I can imagine
  that at some point in the future, ARMv8.2+ systems will be the vast majority,
  so it might be nice to support enabling it unconditionally (same for any
  of the alternative bits really). Is there a long-term strategy?

Another good reason for an option turning these things on by default is
that it makes debugging *so* much easier when the vmlinux matches what's
actually running!

So yes, that's definitely something we should look at in the long-term,
but we still need the live patching for distro kernels that will assumedly
want a single Image covering ARMv8+ for a while.

Will