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authorChristoph Hellwig <hch@lst.de>2016-11-09 04:15:02 +0300
committerThomas Gleixner <tglx@linutronix.de>2016-11-09 10:25:08 +0300
commit212bd846223c718b6577d4df16fd8d05a55ad914 (patch)
tree3dec4e4929b02753ffba2018ea8849eb8cd29f11 /kernel/irq
parent20e407e195b29a4f5a18d713a61f54a75f992bd5 (diff)
downloadlinux-212bd846223c718b6577d4df16fd8d05a55ad914.tar.xz
genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()
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 <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Acked-by: Jens Axboe <axboe@kernel.dk> Cc: linux-block@vger.kernel.org Cc: linux-pci@vger.kernel.org Link: http://lkml.kernel.org/r/1478654107-7384-3-git-send-email-hch@lst.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/affinity.c24
1 files changed, 10 insertions, 14 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 17f51d63da56..8d9259727cb4 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -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;
}