Re: [PATCH v2a 3/6] x86/microcode/intel: Establish staging control logic

[Chang S. Bae]

On 3/26/2025 6:44 PM, Chao Gao wrote:
> The check I suggested can also achieve the goal and is simpler, right?
Okay, I’d (finally) define this mask compilable for CONFIG_SMP=n, in 
topology.h:

    #define cpu_primary_thread_mask cpu_none_mask

Then,

    for_each_cpu(cpu, cpu_primary_thread_mask) {
        if (topology_logical_package_id(cpu) == pkg_id)
            continue;
        ...
    }

This still looks simpler. Plus, while timing isn’t a major concern on 
this staging path, cpumask_first() on every CPU appears costly. On my 
measurements, this takes about a third of the time compared to yours.

Thanks,
Chang