softirq: Use _RET_IP_

Use the already defined macro to pass the function return address.

Signed-off-by: Davidlohr Bueso <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Thomas Gleixner <[e-mail]>

kernel/softirq.c

···
 
 void local_bh_disable(void)
 {
-	__local_bh_disable((unsigned long)__builtin_return_address(0),
-				SOFTIRQ_DISABLE_OFFSET);
+	__local_bh_disable(_RET_IP_, SOFTIRQ_DISABLE_OFFSET);
 }
 
 EXPORT_SYMBOL(local_bh_disable);
···
 	WARN_ON_ONCE(!irqs_disabled());
 
 	if (softirq_count() == cnt)
-		trace_softirqs_on((unsigned long)__builtin_return_address(0));
+		trace_softirqs_on(_RET_IP_);
 	sub_preempt_count(cnt);
 }
 
···
 
 void local_bh_enable(void)
 {
-	_local_bh_enable_ip((unsigned long)__builtin_return_address(0));
+	_local_bh_enable_ip(_RET_IP_);
 }
 EXPORT_SYMBOL(local_bh_enable);
 
···
 	pending = local_softirq_pending();
 	account_irq_enter_time(current);
 
-	__local_bh_disable((unsigned long)__builtin_return_address(0),
-				SOFTIRQ_OFFSET);
+	__local_bh_disable(_RET_IP_, SOFTIRQ_OFFSET);
 	lockdep_softirq_enter();
 
 	cpu = smp_processor_id();