[GIT PULL] RISC-V Fixes for 5.9-rc2

[Christoph Hellwig]

On Fri, Sep 04, 2020 at 08:58:25PM +0800, Qiu Wenbo wrote:
> I can confirm this patch also breaks K210 support. It seems that
> csr_read(CSR_TIME) will trigger an illegal instruction exception on K210.

CSR_TIME is trapped by just about every implementation I know (which is
explicitly allowed by the spec).  That is why we should never use it
from common M-mode code.