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genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()

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Only calculate the affinity for the main I/O vectors, and skip the pre or
post vectors specified by struct irq_affinity.

Also remove the irq_affinity cpumask argument that has never been used.  If
we ever need it in the future we can pass it through struct irq_affinity.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Acked-by: Jens Axboe <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Christoph Hellwig 2016-11-08 17:15:02 -08:00 • committed by Thomas Gleixner
commit 212bd84622
3 changed files with 16 additions and 20 deletions
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24
kernel/irq/affinity.c
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@ -131,24 +131,20 @@ out:
}
/**
* 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
* irq_calc_affinity_vectors - Calculate the optimal number of vectors
* @maxvec: The maximum number of vectors available
* @affd: Description of the affinity requirements
*/
int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd)
{
int cpus, ret;
int resv = affd->pre_vectors + affd->post_vectors;
int vecs = maxvec - resv;
int cpus;
/* 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);
ret = (cpus < maxvec) ? cpus : maxvec;
cpus = cpumask_weight(cpu_online_mask);
put_online_cpus();
return ret;
return min(cpus, vecs) + resv;
}