frv: add atomic64_add_unless()

The build of frv allmodconfig was failing with the error:
lib/atomic64_test.c:209:9: error:

	implicit declaration of function 'atomic64_add_unless'

All the atomic64 operations were defined in frv, but
atomic64_add_unless() was not done.

Implement atomic64_add_unless() as done in other arches.

Link: http://lkml.kernel.org/r/1484781236-6698-1-git-send-email-sudipm.mukherjee@gmail.com
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/frv/include/asm/atomic.h b/arch/frv/include/asm/atomic.h
index 1c2a5e2..994ed3d 100644 (file)
--- a/arch/frv/include/asm/atomic.h
+++ b/arch/frv/include/asm/atomic.h
@@ -161,6 +161,22 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
        return c;
 }
 
+static inline int atomic64_add_unless(atomic64_t *v, long long i, long long u)
+{
+       long long c, old;
+
+       c = atomic64_read(v);
+       for (;;) {
+               if (unlikely(c == u))
+                       break;
+               old = atomic64_cmpxchg(v, c, c + i);
+               if (likely(old == c))
+                       break;
+               c = old;
+       }
+       return c != u;
+}
+
 #define ATOMIC_OP(op)                                                  \
 static inline int atomic_fetch_##op(int i, atomic_t *v)                        \
 {                                                                      \