12 #define MAX(a,b) ((a) > (b) ? (a) : (b))
13 #define MIN(a,b) ((a) < (b) ? (a) : (b))
16 * container_of - cast a member of a structure out to the containing structure
17 * @ptr: the pointer to the member.
18 * @type: the type of the container struct this is embedded in.
19 * @member: the name of the member within the struct.
22 #define container_of(ptr, type, member) ({ \
23 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
24 (type *)( (char *)__mptr - offsetof(type,member) );})