2 files changed, 11 insertions, 0 deletions

diff --git a/include/asm-s390/atomic.h b/include/asm-s390/atomic.h
index d82aedf616fe..be6fefe223d6 100644
--- a/include/asm-s390/atomic.h
+++ b/include/asm-s390/atomic.h
@@ -75,6 +75,8 @@ static __inline__ void atomic_set_mask(unsigned long mask, atomic_t * v)
                __CS_LOOP(v, mask, "or");
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static __inline__ int atomic_cmpxchg(atomic_t *v, int old, int new)
 {
         __asm__ __volatile__("  cs   %0,%3,0(%2)\n"
diff --git a/include/asm-s390/mutex.h b/include/asm-s390/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-s390/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>