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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _CONTAINER_OF_H
#define _CONTAINER_OF_H
#include <stddef.h>
#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
#undef offsetof
#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
#define typeof_member(T, m) typeof(((T*)0)->m)
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
*/
#define container_of(ptr, type, member) ({ \
_Static_assert(__same_type(*(ptr), typeof_member(type, member)) || \
__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
(type *)((void *)(ptr) - offsetof(type, member)); })
#define container_of_const(ptr, type, member) \
_Generic(ptr, \
const typeof(*(ptr)) *: ((const type *)container_of(ptr, type, member)),\
default: ((type *)container_of(ptr, type, member)) \
)
#endif /* _CONTAINER_OF_H */
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