[S390] Inline assembly cleanup.

Major cleanup of all s390 inline assemblies. They now have a common
coding style. Quite a few have been shortened, mainly by using register
asm variables. Use of the EX_TABLE macro helps  as well. The atomic ops,
bit ops and locking inlines new use the Q-constraint if a newer gcc
is used.  That results in slightly better code.

Thanks to Christian Borntraeger for proof reading the changes.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index e3d9325..a21cfbb 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -101,7 +101,7 @@
         /*
          * Store processor id in lowcore (used e.g. in timer_interrupt)
          */
-        asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
+	asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
         S390_lowcore.cpu_data.cpu_addr = addr;
 
         /*