s390/irq: Convert to use flag output macros

Use flag output macros in inline asm to allow for better code generation if
the compiler has support for the flag output constraint.

Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: hcahca

arch/s390/kernel/irq.c

@@ -30,6 +30,7 @@
 #include <asm/stacktrace.h>
 #include <asm/softirq_stack.h>
 #include <asm/vtime.h>
+#include <asm/asm.h>
 #include "entry.h"
 
 DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
@@ -129,9 +130,13 @@ static int irq_pending(struct pt_regs *regs)
 {
 	int cc;
 
-	asm volatile("tpi 0\n"
-		     "ipm %0" : "=d" (cc) : : "cc");
-	return cc >> 28;
+	asm volatile(
+		"	tpi	 0\n"
+		CC_IPM(cc)
+		: CC_OUT(cc, cc)
+		:
+		: CC_CLOBBER);
+	return CC_TRANSFORM(cc);
 }
 
 void noinstr do_io_irq(struct pt_regs *regs)