Oliver O'Halloran <ooh...@gmail.com> writes:
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index 46f071cedf31..7b2ed0d6fc96 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -1043,7 +1081,19 @@ void __init smp_cpus_done(unsigned int max_cpus)
>
> dump_numa_cpu_topology();
>
> - set_sched_topology(powerpc_topology);
> + /*
> + * If any CPU detects that it's sharing a cache with another CPU then
> + * use the deeper topology that is aware of this sharing.
> + */
> + if (shared_caches) {
> + pr_info("Using shared cache scheduler topology\n");
> + set_sched_topology(power9_topology);
> + /* HACK: warn if we're using this on anything by P9 */
> + WARN_ON((mfspr(SPRN_PVR) & 0xffffff00) != 0x004e0100);
Um, yuck.
Why are we doing that?
cheers
