RDMA: hfi1: simplify find_hw_thread_mask()

The function opencodes cpumask_nth() and cpumask_clear_cpus(). The
dedicated helpers are easier to use and usually much faster than
opencoded for-loops.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Link: https://patch.msgid.link/20250604193947.11834-4-yury.norov@gmail.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/hfi1/affinity.c
index f2c530ab85a5630d3f618507eee64ae8e4492191..9ea80b777061e6b185091523b5e80348ec66b8aa 100644 (file)
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -963,7 +963,7 @@ void hfi1_put_irq_affinity(struct hfi1_devdata *dd,
 static void find_hw_thread_mask(uint hw_thread_no, cpumask_var_t hw_thread_mask,
                                struct hfi1_affinity_node_list *affinity)
 {
-       int possible, curr_cpu, i;
+       int curr_cpu;
        uint num_cores_per_socket;
 
        cpumask_copy(hw_thread_mask, &affinity->proc.mask);
@@ -976,17 +976,9 @@ static void find_hw_thread_mask(uint hw_thread_no, cpumask_var_t hw_thread_mask,
                                                node_affinity.num_online_nodes;
 
        /* Removing other siblings not needed for now */
-       possible = cpumask_weight(hw_thread_mask);
-       curr_cpu = cpumask_first(hw_thread_mask);
-       for (i = 0;
-            i < num_cores_per_socket * node_affinity.num_online_nodes;
-            i++)
-               curr_cpu = cpumask_next(curr_cpu, hw_thread_mask);
-
-       for (; i < possible; i++) {
-               cpumask_clear_cpu(curr_cpu, hw_thread_mask);
-               curr_cpu = cpumask_next(curr_cpu, hw_thread_mask);
-       }
+       curr_cpu = cpumask_cpumask_nth(num_cores_per_socket *
+                       node_affinity.num_online_nodes, hw_thread_mask) + 1;
+       cpumask_clear_cpus(hw_thread_mask, curr_cpu, nr_cpu_ids - curr_cpu);
 
        /* Identifying correct HW threads within physical cores */
        cpumask_shift_left(hw_thread_mask, hw_thread_mask,