On Tue, 13 Nov 2018, Patrick Stählin wrote:

> Needed for kprobes support. Copied and adapted from arm64 code.
> 
> Signed-off-by: Patrick Stählin <me@packi.ch>

Planning to queue an updated version of this for v5.5-rc.  More 
discussion here:

https://lore.kernel.org/linux-riscv/alpine.DEB.2.21.9999.1911211418320.5296@viisi.sifive.com/T/#u


- Paul