116 static __always_inline u64 field_multiplier(u64 field)  in field_multiplier()  argument
118 	if ((field | (field - 1)) & ((field | (field - 1)) + 1))  in field_multiplier()
120 	return field & -field;  in field_multiplier()
122 static __always_inline u64 field_mask(u64 field)  in field_mask()  argument
124 	return field / field_multiplier(field);  in field_mask()
126 #define field_max(field)	((typeof(field))field_mask(field))  argument
128 static __always_inline __##type type##_encode_bits(base v, base field)	\
130 	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
132 	return to((v & field_mask(field)) * field_multiplier(field));	\
135 					base val, base field)		\
137 	return (old & ~to(field)) | type##_encode_bits(val, field);	\
140 					base val, base field)		\
142 	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
144 static __always_inline base type##_get_bits(__##type v, base field)	\
146 	return (from(v) & field)/field_multiplier(field);		\