alloc_up
chunk = alloc_up(room, 0);
mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
static int tb_dp_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
*alloc_up = 0;
tmp = min(*alloc_up, max_bw_rounded);
*alloc_up = tmp;
int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
ret = tunnel->alloc_bandwidth(tunnel, alloc_up, alloc_down);
int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
int (*alloc_bandwidth)(struct tb_tunnel *tunnel, int *alloc_up,