loc
#define kprobe_event_gen_cmd_start(cmd, name, loc, ...) \
__kprobe_event_gen_cmd_start(cmd, false, name, loc, ## __VA_ARGS__, NULL)
#define kretprobe_event_gen_cmd_start(cmd, name, loc, ...) \
__kprobe_event_gen_cmd_start(cmd, true, name, loc, ## __VA_ARGS__, NULL)
const char *loc, ...);