cmdline_subpart
struct cmdline_subpart *subpart;
struct cmdline_subpart **next_subpart;
static int add_part(int slot, struct cmdline_subpart *subpart,
struct cmdline_subpart *subpart;
struct cmdline_subpart *next_subpart;
struct cmdline_subpart *subpart;
static int parse_subpart(struct cmdline_subpart **subpart, char *partdef)
struct cmdline_subpart *new_subpart;
new_subpart = kzalloc_obj(struct cmdline_subpart);