44 #define __READ_ONCE(x)	(*(const volatile __unqual_scalar_typeof(x) *)&(x))  argument
47 #define READ_ONCE(x)							\  argument
49 	compiletime_assert_rwonce_type(x);				\
50 	__READ_ONCE(x);							\
53 #define __WRITE_ONCE(x, val)						\  argument
55 	*(volatile typeof(x) *)&(x) = (val);				\
58 #define WRITE_ONCE(x, val)						\  argument
60 	compiletime_assert_rwonce_type(x);				\
61 	__WRITE_ONCE(x, val);						\
75 #define READ_ONCE_NOCHECK(x)						\  argument
77 	compiletime_assert(sizeof(x) == sizeof(unsigned long),		\
79 	(typeof(x))__read_once_word_nocheck(&(x));			\