cpumask: convert drivers/net/sfc

Impact: reduce stack usage, use new cpumask API.

Remove a cpumask from the stack.  Ben Hutchings indicated that printing
a warning and returning 1 was acceptable for the corner case where allocation
fails.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: linux-net-drivers@solarflare.com

diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index f2e56ce..101c00a 100644 (file)
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -854,20 +854,27 @@ static void efx_fini_io(struct efx_nic *efx)
  * interrupts across them. */
 static int efx_wanted_rx_queues(void)
 {
-       cpumask_t core_mask;
+       cpumask_var_t core_mask;
        int count;
        int cpu;
 
-       cpus_clear(core_mask);
+       if (!alloc_cpumask_var(&core_mask, GFP_KERNEL)) {
+               printk(KERN_WARNING
+                      "efx.c: allocation failure, irq balancing hobbled\n");
+               return 1;
+       }
+
+       cpumask_clear(core_mask);
        count = 0;
        for_each_online_cpu(cpu) {
-               if (!cpu_isset(cpu, core_mask)) {
+               if (!cpumask_test_cpu(cpu, core_mask)) {
                        ++count;
-                       cpumask_or(&core_mask, &core_mask,
+                       cpumask_or(core_mask, core_mask,
                                   topology_core_cpumask(cpu));
                }
        }
 
+       free_cpumask_var(core_mask);
        return count;
 }