On Fri, 22 Jan 2021 07:15:03 +0000 (UTC), Christophe Leroy wrote:
> wrtspr() is a function to write an arbitrary value in a special
> register. It is used on 8xx to write to SPRN_NRI, SPRN_EID and
> SPRN_EIE. Writing any value to one of those will play with MSR EE
> and MSR RI regardless of that value.
>
> r0 is used many places in the generated code and using r0 for
> that creates an unnecessary dependency of this instruction with
> preceding ones using r0 in a few places in vmlinux.
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/32: Use r2 in wrtspr() instead of r0
https://git.kernel.org/powerpc/c/867e762480f4ad4106b16299a373fa23eccf5b4b
cheers
