136 static __always_inline u64 field_multiplier(u64 field)  in field_multiplier()  argument
138 	if ((field | (field - 1)) & ((field | (field - 1)) + 1))  in field_multiplier()
140 	return field & -field;  in field_multiplier()
142 static __always_inline u64 field_mask(u64 field)  in field_mask()  argument
144 	return field / field_multiplier(field);  in field_mask()
146 #define field_max(field)	((typeof(field))field_mask(field))  argument
148 static __always_inline __##type type##_encode_bits(base v, base field)	\
150 	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
152 	return to((v & field_mask(field)) * field_multiplier(field));	\
155 					base val, base field)		\
157 	return (old & ~to(field)) | type##_encode_bits(val, field);	\
160 					base val, base field)		\
162 	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
164 static __always_inline base type##_get_bits(__##type v, base field)	\
166 	return (from(v) & field)/field_multiplier(field);		\