[PATCH] Merge two rcu types

[Bruno Wolff III]

On Thu, Mar 14, 2019 at 07:32:11 -0500,
  Bruno Wolff III <bruno at wolff.to> wrote:
>
>In case it isn't obvious, the patch I supplied is only good for 5.1+ 
>kernels. I'm not sure how you wanted to handle doing compatibility for 
>older kernels and didn't even have a good idea how to start.

If I want to try to rework this myself so that the main code is going to 
be usable upstream, but it still works with older kernels, is there a 
suggested approach. Using the old names in the main code using macros 
to make it work isn't going to fly upstream. I'm not sure that replicating 
large chunks of code in compat is a good idea either.