-/*
- * READ/WRITE_ONCE were introduced in kernel 3.19 and ACCESS_ONCE
- * was removed in 4.15. Prefer READ/WRITE but fallback to ACCESS
- * when they are not available.
- */
-#ifndef READ_ONCE
-# define READ_ONCE(x) ACCESS_ONCE(x)
-#endif
-
-#ifndef WRITE_ONCE
-# define WRITE_ONCE(x, val) ({ ACCESS_ONCE(x) = val; })
-#endif
-