drbd_bm_e_weight
bm_ext->rs_left = drbd_bm_e_weight(device, enr);
ext->rs_left = drbd_bm_e_weight(device, enr);
int rs_left = drbd_bm_e_weight(device, enr);
bm_ext->rs_left = drbd_bm_e_weight(device, enr);
extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr);