[PATCH 4/5] powerpc: Define config option for processors without broadcast TLBIE

[Segher Boessenkool]

On Wed, Jan 29, 2025 at 09:53:44AM +1100, Paul Mackerras wrote:
> Power ISA v3.1 implementations in the Linux Compliancy Subset and
> lower are not required to implement broadcast TLBIE, and in fact
> Microwatt doesn't.

But this pretty much means that such systems cannot be SMP systems at
all.  Implementing the necessary synchronisation using some
cobbled-together rickety jury-rigged contraption is not anyone's goal.

Interesting that you did not see any performance loss, btw!  Well you
didn't try it on anything bigger than a simple dual CPU :-)


Segher