rt-thread/bsp/allwinner/libraries/sunxi-hal/include/hal/aw_common.h

#ifndef COMMON_H
#define COMMON_H

#define ARRAY_SIZE(x)       (sizeof(x) / sizeof((x)[0]))

#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif

/**
 * 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) ({          \
    const typeof(((type *)0)->member) * __mptr = (ptr); \
    (type *)((char *)__mptr - offsetof(type, member)); })

#define UNUSED(var) {(void)var;}

#endif  /*COMMON_H*/