[S390] add generic atomic64 support for 31 bit
Performance counters need 64 bit atomic operations.
To keep the patch small we use the simple generic atomic64_t implementation.
The native implementation follows with the next kernel.
Fixes this build bug:
In file included from kernel/sched.c:42:
include/linux/perf_counter.h:427: error: expected specifier-qualifier-list before 'atomic64_t'
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/atomic.h b/arch/s390/include/asm/atomic.h
index fca9dff..c7d0abf 100644
--- a/arch/s390/include/asm/atomic.h
+++ b/arch/s390/include/asm/atomic.h
@@ -268,7 +268,12 @@
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
#undef __CSG_LOOP
-#endif
+
+#else /* __s390x__ */
+
+#include <asm-generic/atomic64.h>
+
+#endif /* __s390x__ */
#define smp_mb__before_atomic_dec() smp_mb()
#define smp_mb__after_atomic_dec() smp_mb()