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SubjectRe: [PATCH v4 2/7] cpumask: Introduce for_each_cpu_andnot()
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On 25/09/22 08:23, Yury Norov wrote:
> On Fri, Sep 23, 2022 at 04:55:37PM +0100, Valentin Schneider wrote:
>> +/**
>> + * for_each_cpu_andnot - iterate over every cpu present in one mask, excluding
>> + * those present in another.
>> + * @cpu: the (optionally unsigned) integer iterator
>> + * @mask1: the first cpumask pointer
>> + * @mask2: the second cpumask pointer
>> + *
>> + * This saves a temporary CPU mask in many places. It is equivalent to:
>> + * struct cpumask tmp;
>> + * cpumask_andnot(&tmp, &mask1, &mask2);
>> + * for_each_cpu(cpu, &tmp)
>> + * ...
>> + *
>> + * After the loop, cpu is >= nr_cpu_ids.
>> + */
>> +#define for_each_cpu_andnot(cpu, mask1, mask2) \
>> + for ((cpu) = -1; \
>> + (cpu) = cpumask_next_andnot((cpu), (mask1), (mask2)), \
>> + (cpu) < nr_cpu_ids;)
>
> This would raise cpumaks_check() warning at the very last iteration.
> Because cpu is initialized insize the loop, you don't need to check it
> at all. You can do it like this:
>
> #define for_each_cpu_andnot(cpu, mask1, mask2) \
> for_each_andnot_bit(...)
>
> Check this series for details (and please review).
> https://lore.kernel.org/all/20220919210559.1509179-8-yury.norov@gmail.com/T/
>

Thanks, I'll have a look.

> Thanks,
> Yury

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