diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/affinity.c | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index 213695a27ddb..f4f29b9d90ee 100644 --- a/kernel/irq/affinity.c +++ b/kernel/irq/affinity.c @@ -106,6 +106,9 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd, int curvec = startvec; nodemask_t nodemsk = NODE_MASK_NONE; + if (!cpumask_weight(cpu_mask)) + return 0; + nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk); /* @@ -173,8 +176,9 @@ out: struct cpumask * irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) { - int curvec, affvecs = nvecs - affd->pre_vectors - affd->post_vectors; - cpumask_var_t nmsk, *node_to_cpumask; + int affvecs = nvecs - affd->pre_vectors - affd->post_vectors; + int curvec, usedvecs; + cpumask_var_t nmsk, npresmsk, *node_to_cpumask; struct cpumask *masks = NULL; /* @@ -187,9 +191,12 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL)) return NULL; + if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL)) + goto outcpumsk; + node_to_cpumask = alloc_node_to_cpumask(); if (!node_to_cpumask) - goto outcpumsk; + goto outnpresmsk; masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL); if (!masks) @@ -202,16 +209,40 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) /* Stabilize the cpumasks */ get_online_cpus(); build_node_to_cpumask(node_to_cpumask); - curvec += irq_build_affinity_masks(affd, curvec, affvecs, - node_to_cpumask, cpu_possible_mask, - nmsk, masks); + + /* Spread on present CPUs starting from affd->pre_vectors */ + usedvecs = irq_build_affinity_masks(affd, curvec, affvecs, + node_to_cpumask, cpu_present_mask, + nmsk, masks); + + /* + * Spread on non present CPUs starting from the next vector to be + * handled. If the spreading of present CPUs already exhausted the + * vector space, assign the non present CPUs to the already spread + * out vectors. + */ + if (usedvecs >= affvecs) + curvec = affd->pre_vectors; + else + curvec = affd->pre_vectors + usedvecs; + cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask); + usedvecs += irq_build_affinity_masks(affd, curvec, affvecs, + node_to_cpumask, npresmsk, + nmsk, masks); put_online_cpus(); /* Fill out vectors at the end that don't need affinity */ + if (usedvecs >= affvecs) + curvec = affd->pre_vectors + affvecs; + else + curvec = affd->pre_vectors + usedvecs; for (; curvec < nvecs; curvec++) cpumask_copy(masks + curvec, irq_default_affinity); + outnodemsk: free_node_to_cpumask(node_to_cpumask); +outnpresmsk: + free_cpumask_var(npresmsk); outcpumsk: free_cpumask_var(nmsk); return masks; |