RDMA: hfi1: use rounddown in find_hw_thread_mask()

num_cores_per_socket is calculated by dividing by
node_affinity.num_online_nodes, but all users of this variable multiply
it by node_affinity.num_online_nodes again. This effectively is the same
as rounding it down by node_affinity.num_online_nodes.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Link: https://patch.msgid.link/20250604193947.11834-6-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 b2884226827a6f83abe602602529e1e0e190fdfa..7fa894c23feaf5158633b73e0d21a8ce715af59a 100644 (file)
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -955,27 +955,22 @@ static void find_hw_thread_mask(uint hw_thread_no, cpumask_var_t hw_thread_mask,
                                struct hfi1_affinity_node_list *affinity)
 {
        int curr_cpu;
-       uint num_cores_per_socket;
+       uint num_cores;
 
        cpumask_copy(hw_thread_mask, &affinity->proc.mask);
 
        if (affinity->num_core_siblings == 0)
                return;
 
-       num_cores_per_socket = node_affinity.num_online_cpus /
-                                       affinity->num_core_siblings /
-                                               node_affinity.num_online_nodes;
+       num_cores = rounddown(node_affinity.num_online_cpus / affinity->num_core_siblings,
+                               node_affinity.num_online_nodes);
 
        /* Removing other siblings not needed for now */
-       curr_cpu = cpumask_cpumask_nth(num_cores_per_socket *
-                       node_affinity.num_online_nodes, hw_thread_mask) + 1;
+       curr_cpu = cpumask_nth(num_cores * 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,
-                          num_cores_per_socket *
-                          node_affinity.num_online_nodes *
-                          hw_thread_no);
+       cpumask_shift_left(hw_thread_mask, hw_thread_mask, num_cores * hw_thread_no);
 }
 
 int hfi1_get_proc_affinity(int node)