sparc: convert old cpumask API into new one

Adapt new API. Almost change is trivial, most important change are to
remove following like =operator.

 cpumask_t cpu_mask = *mm_cpumask(mm);
 cpus_allowed = current->cpus_allowed;

Because cpumask_var_t is =operator unsafe. These usage might prevent
kernel core improvement.

No functional change.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/us3_cpufreq.c b/arch/sparc/kernel/us3_cpufreq.c
index f35d1e7..9a8ceb7 100644
--- a/arch/sparc/kernel/us3_cpufreq.c
+++ b/arch/sparc/kernel/us3_cpufreq.c
@@ -85,7 +85,7 @@
 	if (!cpu_online(cpu))
 		return 0;
 
-	cpus_allowed = current->cpus_allowed;
+	cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
 	set_cpus_allowed_ptr(current, cpumask_of(cpu));
 
 	reg = read_safari_cfg();
@@ -105,7 +105,7 @@
 	if (!cpu_online(cpu))
 		return;
 
-	cpus_allowed = current->cpus_allowed;
+	cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
 	set_cpus_allowed_ptr(current, cpumask_of(cpu));
 
 	new_freq = sparc64_get_clock_tick(cpu) / 1000;