scripts/atomic/fallbacks/fetch_add_unless

   1 cat << EOF
   2         ${int} c = raw_${atomic}_read(v);
   3
   4         do {
   5                 if (unlikely(c == u))
   6                         break;
   7         } while (!raw_${atomic}_try_cmpxchg(v, &c, c + a));
   8
   9         return c;
  10 EOF