include/linux/bitfield.h

71 				 _pfx "value too large for the field"); \
80  * FIELD_MAX() - produce the maximum value representable by a field
81  * @_mask: shifted mask defining the field's length and position
83  * FIELD_MAX() returns the maximum value that can be held in the field
93  * FIELD_FIT() - check if value fits in the field
94  * @_mask: shifted mask defining the field's length and position
95  * @_val:  value to test against the field
107  * @_mask: shifted mask defining the field's length and position
108  * @_val:  value to put in the field
123  * @_mask: shifted mask defining the field's length and position
124  * @_val:  value to put in the field
147  * @_mask: shifted mask defining the field's length and position
150  * FIELD_GET() extracts the field specified by @_mask from the
163 static __always_inline u64 field_multiplier(u64 field)
165 	if ((field | (field - 1)) & ((field | (field - 1)) + 1))
167 	return field & -field;
169 static __always_inline u64 field_mask(u64 field)
171 	return field / field_multiplier(field);
173 #define field_max(field)	((typeof(field))field_mask(field))
175 static __always_inline __##type type##_encode_bits(base v, base field)	\
177 	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
179 	return to((v & field_mask(field)) * field_multiplier(field));	\
182 					base val, base field)		\
184 	return (old & ~to(field)) | type##_encode_bits(val, field);	\
187 					base val, base field)		\
189 	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
191 static __always_inline base type##_get_bits(__##type v, base field)	\
193 	return (from(v) & field)/field_multiplier(field);		\