s390/irq: Set CIF_NOHZ_DELAY in do_io_irq()

Both do_airq_interrupt() and do_io_interrupt() set
CIF_NOHZ_DELAY. Move it to do_io_irq() to simplify
the code.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/kernel/irq.c

@@ -150,6 +150,7 @@ void noinstr do_io_irq(struct pt_regs *regs)
 	if (from_idle)
 		account_idle_time_irq();
 
+	set_cpu_flag(CIF_NOHZ_DELAY);
 	do {
 		regs->tpi_info = S390_lowcore.tpi_info;
 		if (S390_lowcore.tpi_info.adapter_IO)

drivers/s390/cio/airq.c

@@ -90,7 +90,6 @@ static irqreturn_t do_airq_interrupt(int irq, void *dummy)
 	struct airq_struct *airq;
 	struct hlist_head *head;
 
-	set_cpu_flag(CIF_NOHZ_DELAY);
 	tpi_info = &get_irq_regs()->tpi_info;
 	trace_s390_cio_adapter_int(tpi_info);
 	head = &airq_lists[tpi_info->isc];

drivers/s390/cio/cio.c

@@ -535,7 +535,6 @@ static irqreturn_t do_cio_interrupt(int irq, void *dummy)
 	struct subchannel *sch;
 	struct irb *irb;
 
-	set_cpu_flag(CIF_NOHZ_DELAY);
 	tpi_info = &get_irq_regs()->tpi_info;
 	trace_s390_cio_interrupt(tpi_info);
 	irb = this_cpu_ptr(&cio_irb);