softirq/s390: Move default mutators of overwritten softirq mask to s390

s390 is now the last architecture that entirely overwrites
local_softirq_pending() and uses the according default definitions of
set_softirq_pending() and or_softirq_pending().

Just move these to s390 to debloat the generic code complexity.

Suggested-by: Peter Zijlstra <[e-mail]>
Signed-off-by: Frederic Weisbecker <[e-mail]>
Acked-by: Thomas Gleixner <[e-mail]>
Acked-by: Peter Zijlstra <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: David S. Miller <[e-mail]>
Cc: Fenghua Yu <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: James E.J. Bottomley <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Martin Schwidefsky <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Rich Felker <[e-mail]>
Cc: Sebastian Andrzej Siewior <[e-mail]>
Cc: Tony Luck <[e-mail]>
Cc: Yoshinori Sato <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/s390/include/asm/hardirq.h

···
 #include <asm/lowcore.h>
 
 #define local_softirq_pending() (S390_lowcore.softirq_pending)
+#define set_softirq_pending(x) (S390_lowcore.softirq_pending = (x))
+#define or_softirq_pending(x)  (S390_lowcore.softirq_pending |= (x))
 
 #define __ARCH_IRQ_STAT
 #define __ARCH_HAS_DO_SOFTIRQ

include/linux/interrupt.h

···
 #define set_softirq_pending(x)	(__this_cpu_write(local_softirq_pending_ref, (x)))
 #define or_softirq_pending(x)	(__this_cpu_or(local_softirq_pending_ref, (x)))
 
-#else /* local_softirq_pending */
-
-#ifndef __ARCH_SET_SOFTIRQ_PENDING
-#define set_softirq_pending(x) (local_softirq_pending() = (x))
-#define or_softirq_pending(x)  (local_softirq_pending() |= (x))
-#endif
-
 #endif /* local_softirq_pending */
 
 /* Some architectures might implement lazy enabling/disabling of