On Wed, Sep 14, 2016 at 04:18:48PM +0200, Christoph Hellwig wrote:
> +/**
> + * irq_calc_affinity_vectors - Calculate to optimal number of vectors for a given affinity mask
> + * @affinity: The affinity mask to spread. If NULL cpu_online_mask
> + * is used
> + * @maxvec: The maximum number of vectors available
> + */
> +int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
> +{
> + int cpus, ret;
> +
> + /* Stabilize the cpumasks */
> + get_online_cpus();
> + /* If the supplied affinity mask is NULL, use cpu online mask */
> + if (!affinity)
> + affinity = cpu_online_mask;
> +
> + cpus = cpumask_weight(affinity);
Should not we consider the result of AND of affinity and cpu_online_mask?
> + ret = (cpus < maxvec) ? cpus : maxvec;
> +
> + put_online_cpus();
> + return ret;
> +}
> +
> static int get_first_sibling(unsigned int cpu)
> {
> unsigned int ret;
> --
> 2.1.4
>
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