netprio: use css ID instead of cgroup ID

netprio uses cgroup ID to index the priority mapping table. This is
currently okay as cgroup IDs are allocated using idr and packed.
However, cgroup IDs will be changed to use full 64bit range and won't
be packed making this impractical. netprio doesn't care what type of
IDs it uses as long as they can identify the controller instances and
are packed. Let's switch to css IDs instead of cgroup IDs.

Signed-off-by: Tejun Heo <[e-mail]>
Acked-by: Neil Horman <[e-mail]>
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Cc: Namhyung Kim <[e-mail]>

include/net/netprio_cgroup.h

···
 
 	rcu_read_lock();
 	css = task_css(p, net_prio_cgrp_id);
-	idx = css->cgroup->id;
+	idx = css->id;
 	rcu_read_unlock();
 	return idx;
 }

net/core/netprio_cgroup.c

···
 static u32 netprio_prio(struct cgroup_subsys_state *css, struct net_device *dev)
 {
 	struct netprio_map *map = rcu_dereference_rtnl(dev->priomap);
-	int id = css->cgroup->id;
+	int id = css->id;
 
 	if (map && id < map->priomap_len)
 		return map->priomap[id];
···
 			    struct net_device *dev, u32 prio)
 {
 	struct netprio_map *map;
-	int id = css->cgroup->id;
+	int id = css->id;
 	int ret;
 
 	/* avoid extending priomap for zero writes */
···
 
 static u64 read_prioidx(struct cgroup_subsys_state *css, struct cftype *cft)
 {
-	return css->cgroup->id;
+	return css->id;
 }
 
 static int read_priomap(struct seq_file *sf, void *v)
···
 	struct cgroup_subsys_state *css;
 
 	cgroup_taskset_for_each(p, css, tset) {
-		void *v = (void *)(unsigned long)css->cgroup->id;
+		void *v = (void *)(unsigned long)css->id;
 
 		task_lock(p);
 		iterate_fd(p->files, 0, update_netprio, v);