Re: [PATCH] xen: fix for_each_cpu when NR_CPUS=1

[Jan Beulich <jbeulich@xxxxxxxx>]

On 12.03.2021 15:03, Ian Jackson wrote:
> Dario Faggioli writes ("[PATCH] xen: fix for_each_cpu when NR_CPUS=1"):
>> -#if NR_CPUS > 1
>>  #define for_each_cpu(cpu, mask)                     \
>>      for ((cpu) = cpumask_first(mask);       \
> 
> Just a thought: does cpumask_first work on an empty mask ?

I'm sure it does, yes - it'll return a value >= nr_cpu_ids in
this case. If it didn't work, NR_CPUS > 1 would also be badly
affected.

Jan