[PATCH v4 09/10] powerpc: Add HOTPLUG_SMT support

[Srikar Dronamraju]

* Laurent Dufour <ldufour at linux.ibm.com> [2023-07-05 16:51:42]:

> From: Michael Ellerman <mpe at ellerman.id.au>
> 
> Add support for HOTPLUG_SMT, which enables the generic sysfs SMT support
> files in /sys/devices/system/cpu/smt, as well as the "nosmt" boot
> parameter.
> 
> Implement the recently added hooks to allow partial SMT states, allow
> any number of threads per core.
> 
> Tie the config symbol to HOTPLUG_CPU, which enables it on the major
> platforms that support SMT. If there are other platforms that want the
> SMT support that can be tweaked in future.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> [ldufour: pass current SMT level to cpu_smt_set_num_threads]
> [ldufour: remove topology_smt_supported]
> [ldufour: remove topology_smt_threads_supported]
> [ldufour: select CONFIG_SMT_NUM_THREADS_DYNAMIC]
> [ldufour: update kernel-parameters.txt]
> Signed-off-by: Laurent Dufour <ldufour at linux.ibm.com>

Looks good to me.

Reviewed-by: Srikar Dronamraju <srikar at linux.vnet.ibm.com>

-- 
Thanks and Regards
Srikar Dronamraju