cortex-m

https://github.com/RT-Thread/rt-thread/blob/master/include/rtservice.h

/**
 * rt_container_of - return the member address of ptr, if the type of ptr is the
 * struct type.
 */
#define rt_container_of(ptr, type, member) \
    ((type *)((char *)(ptr) - (unsigned long)(&((type *)0)->member)))

按照英文，应该是说如果 ptr 的类型是 struct 类型，返回ptr的成员（member）的地址

但实际上，ptr 应该是某个 struct （type）的一个

• The set_mode_X() HIL functions need to support returning an error if hardware does not support that mode or if the implementation cannot put the hardware in to that mode at that time. See for an example where panic is used instead of returning an error https://github.com/tock/tock/pull/2629/files.