Re: [RFC PATCH 3/5] RISC-V: Add cpu_operatios structure

[Christoph Hellwig]

On Wed, Aug 22, 2018 at 08:54:51PM +0530, Anup Patel wrote:
> IMHO, rather than waiting for new CPU ON/OFF methods to come-up we
> can keep the cpu_operations ready. Also, we are not re-inventing anything
> here which we might have to discard later because cpu_operations are
> already tried and hardened for Linux ARM64.

Which is a different cpu architecture, and has shown to actually need
it.  IFF we end up needing it on riscv we can still copy and paste
it from AMD64.


> I agree with you that in long-term SBI-based CPU ON/OFF will be widely
> used. Most likely we will have at-least two CPU ON/OFF methods:
> 1. Existing lottery based spinning
> 2. New SBI calls

And in this most likely case there is no need for an ops vector,
a simple if/else will be much simpler and cleaner.