[PATCH] [net-next] hns_enet: use cpumask_var_t for on-stack mask

[Arnd Bergmann]

On large SMP builds, we can run into a build warning:

drivers/net/ethernet/hisilicon/hns/hns_enet.c: In function 
'hns_set_irq_affinity.isra.27':
drivers/net/ethernet/hisilicon/hns/hns_enet.c:1242:1: warning: the frame size 
of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]

The solution here is to use cpumask_var_t, which can use dynamic
allocation when CONFIG_CPUMASK_OFFSTACK is enabled.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/net/ethernet/hisilicon/hns/hns_enet.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c 
b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index f7b75e96c1c3..fefe371e5907 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -1202,43 +1202,48 @@ static void hns_set_irq_affinity(struct hns_nic_priv 
*priv)
        struct hns_nic_ring_data *rd;
        int i;
        int cpu;
-       cpumask_t mask;
+       cpumask_var_t mask;
+
+       if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+               return;
 
        /*diffrent irq banlance for 16core and 32core*/
        if (h->q_num == num_possible_cpus()) {
                for (i = 0; i < h->q_num * 2; i++) {
                        rd = &priv->ring_data[i];
                        if (cpu_online(rd->queue_index)) {
-                               cpumask_clear(&mask);
+                               cpumask_clear(mask);
                                cpu = rd->queue_index;
-                               cpumask_set_cpu(cpu, &mask);
+                               cpumask_set_cpu(cpu, mask);
                                (void)irq_set_affinity_hint(rd->ring->irq,
-                                                           &mask);
+                                                           mask);
                        }
                }
        } else {
                for (i = 0; i < h->q_num; i++) {
                        rd = &priv->ring_data[i];
                        if (cpu_online(rd->queue_index * 2)) {
-                               cpumask_clear(&mask);
+                               cpumask_clear(mask);
                                cpu = rd->queue_index * 2;
-                               cpumask_set_cpu(cpu, &mask);
+                               cpumask_set_cpu(cpu, mask);
                                (void)irq_set_affinity_hint(rd->ring->irq,
-                                                           &mask);
+                                                           mask);
                        }
                }
 
                for (i = h->q_num; i < h->q_num * 2; i++) {
                        rd = &priv->ring_data[i];
                        if (cpu_online(rd->queue_index * 2 + 1)) {
-                               cpumask_clear(&mask);
+                               cpumask_clear(mask);
                                cpu = rd->queue_index * 2 + 1;
-                               cpumask_set_cpu(cpu, &mask);
+                               cpumask_set_cpu(cpu, mask);
                                (void)irq_set_affinity_hint(rd->ring->irq,
-                                                           &mask);
+                                                           mask);
                        }
                }
        }
+
+       free_cpumask_var(mask);
 }
 
 static int hns_nic_init_irq(struct hns_nic_priv *priv)
-- 
2.9.0