genirq/affinity: Pass affinity managed mask array to irq_build_affinity_masks

Pass affinity managed mask array to irq_build_affinity_masks() so that the
index of the first affinity managed vector is always zero.

This allows to simplify the implementation a bit.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20221227022905.352674-3-ming.lei@redhat.com

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 3361e36..da6379c 100644 (file)
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -246,14 +246,13 @@ static void alloc_nodes_vectors(unsigned int numvecs,
 
 static int __irq_build_affinity_masks(unsigned int startvec,
                                      unsigned int numvecs,
-                                     unsigned int firstvec,
                                      cpumask_var_t *node_to_cpumask,
                                      const struct cpumask *cpu_mask,
                                      struct cpumask *nmsk,
                                      struct irq_affinity_desc *masks)
 {
        unsigned int i, n, nodes, cpus_per_vec, extra_vecs, done = 0;
-       unsigned int last_affv = firstvec + numvecs;
+       unsigned int last_affv = numvecs;
        unsigned int curvec = startvec;
        nodemask_t nodemsk = NODE_MASK_NONE;
        struct node_vectors *node_vectors;
@@ -273,7 +272,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
                        cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
                        cpumask_or(&masks[curvec].mask, &masks[curvec].mask, nmsk);
                        if (++curvec == last_affv)
-                               curvec = firstvec;
+                               curvec = 0;
                }
                return numvecs;
        }
@@ -321,7 +320,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
                         * may start anywhere
                         */
                        if (curvec >= last_affv)
-                               curvec = firstvec;
+                               curvec = 0;
                        irq_spread_init_one(&masks[curvec].mask, nmsk,
                                                cpus_per_vec);
                }
@@ -336,11 +335,10 @@ static int __irq_build_affinity_masks(unsigned int startvec,
  *     1) spread present CPU on these vectors
  *     2) spread other possible CPUs on these vectors
  */
-static int irq_build_affinity_masks(unsigned int startvec, unsigned int numvecs,
+static int irq_build_affinity_masks(unsigned int numvecs,
                                    struct irq_affinity_desc *masks)
 {
-       unsigned int curvec = startvec, nr_present = 0, nr_others = 0;
-       unsigned int firstvec = startvec;
+       unsigned int curvec = 0, nr_present = 0, nr_others = 0;
        cpumask_var_t *node_to_cpumask;
        cpumask_var_t nmsk, npresmsk;
        int ret = -ENOMEM;
@@ -360,9 +358,8 @@ static int irq_build_affinity_masks(unsigned int startvec, unsigned int numvecs,
        build_node_to_cpumask(node_to_cpumask);
 
        /* Spread on present CPUs starting from affd->pre_vectors */
-       ret = __irq_build_affinity_masks(curvec, numvecs, firstvec,
-                                        node_to_cpumask, cpu_present_mask,
-                                        nmsk, masks);
+       ret = __irq_build_affinity_masks(curvec, numvecs, node_to_cpumask,
+                                        cpu_present_mask, nmsk, masks);
        if (ret < 0)
                goto fail_build_affinity;
        nr_present = ret;
@@ -374,13 +371,12 @@ static int irq_build_affinity_masks(unsigned int startvec, unsigned int numvecs,
         * out vectors.
         */
        if (nr_present >= numvecs)
-               curvec = firstvec;
+               curvec = 0;
        else
-               curvec = firstvec + nr_present;
+               curvec = nr_present;
        cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
-       ret = __irq_build_affinity_masks(curvec, numvecs, firstvec,
-                                        node_to_cpumask, npresmsk, nmsk,
-                                        masks);
+       ret = __irq_build_affinity_masks(curvec, numvecs, node_to_cpumask,
+                                        npresmsk, nmsk, masks);
        if (ret >= 0)
                nr_others = ret;
 
@@ -463,7 +459,7 @@ irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
                unsigned int this_vecs = affd->set_size[i];
                int ret;
 
-               ret = irq_build_affinity_masks(curvec, this_vecs, masks);
+               ret = irq_build_affinity_masks(this_vecs, &masks[curvec]);
                if (ret) {
                        kfree(masks);
                        return NULL;