include/linux/overflow.h

11  * type. These macros may also be useful elsewhere. It would seem more obvious
23  * macros also produce sensible values for the exotic type _Bool. [The
33 #define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
48  * both the type-agnostic benefits of the macros while also being able to
72  * @type: type for result of calculation
79 #define wrapping_add(type, a, b)				\
81 		type __val;					\
118  * @type: type for result of calculation
125 #define wrapping_sub(type, a, b)				\
127 		type __val;					\
164  * @type: type for result of calculation
171 #define wrapping_mul(type, a, b)				\
173 		type __val;					\
224  *		    or data type
227  * @T: destination variable or data type proposed to store @x
230  * the storage of the type in @T. @x and @T can have different types.
245  * @T: variable or data type
249  * of the second argument's type, it returns true. Otherwise, this falls
264  * lvalue must be size_t to avoid implicit type conversion.
283  * lvalue must be size_t to avoid implicit type conversion.
304  * The lvalue must be size_t to avoid implicit type conversion.
377  * @type: structure type name.
381  * Calculates size of memory needed for structure @type followed by an
384  * instance variable of type @type.
388 #define struct_size_t(type, member, count)					\
389 	struct_size((type *)NULL, member, count)
395  * @type: structure type name, including "struct" keyword.
401 #define _DEFINE_FLEX(type, name, member, count, initializer...)			\
405 		u8 bytes[struct_size_t(type, member, count)];			\
406 		type obj;							\
408 	type *name = (type *)&name##_u
414  * @type: structure type name, including "struct" keyword.
419  * Define a zeroed, on-stack, instance of @type structure with a trailing
423 #define DEFINE_RAW_FLEX(type, name, member, count)	\
424 	_DEFINE_FLEX(type, name, member, count, = {})
430  * @TYPE: structure type name, including "struct" keyword.