Blackfin: don't touch task->cpus_allowed directly

Every callter (except kthread_bind) should use proper
set_cpus_allowed_ptr() APIs.
Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

arch/blackfin/kernel/process.c

@@ -171,10 +171,8 @@ asmlinkage int bfin_clone(struct pt_regs *regs)
 	unsigned long newsp;
 
 #ifdef __ARCH_SYNC_CORE_DCACHE
-	if (current->rt.nr_cpus_allowed == num_possible_cpus()) {
-		current->cpus_allowed = cpumask_of_cpu(smp_processor_id());
-		current->rt.nr_cpus_allowed = 1;
-	}
+	if (current->rt.nr_cpus_allowed == num_possible_cpus())
+		set_cpus_allowed_ptr(current, cpumask_of(smp_processor_id()));
 #endif
 
 	/* syscall2 puts clone_flags in r0 and usp in r1 */