blkcg: remove unused @pol and @plid parameters

@pol to blkg_to_pdata() and @plid to blkg_lookup_create() are no
longer necessary.  Drop them.
Signed-off-by: Tejun Heo <tj@kernel.org>

block/blk-cgroup.c

@@ -568,7 +568,6 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 
 struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 				       struct request_queue *q,
-				       enum blkio_policy_id plid,
 				       bool for_root)
 	__releases(q->queue_lock) __acquires(q->queue_lock)
 {
@@ -1027,7 +1026,7 @@ static int blkio_policy_parse_and_set(char *buf, enum blkio_policy_id plid,
 	rcu_read_lock();
 
 	spin_lock_irq(disk->queue->queue_lock);
-	blkg = blkg_lookup_create(blkcg, disk->queue, plid, false);
+	blkg = blkg_lookup_create(blkcg, disk->queue, false);
 	spin_unlock_irq(disk->queue->queue_lock);
 
 	if (IS_ERR(blkg)) {

block/blk-cgroup.h

@@ -266,13 +266,10 @@ static inline void *blkg_to_pdata(struct blkio_group *blkg,
 /**
  * pdata_to_blkg - get blkg associated with policy private data
  * @pdata: policy private data of interest
- * @pol: policy @pdata is for
  *
- * @pdata is policy private data for @pol.  Determine the blkg it's
- * associated with.
+ * @pdata is policy private data.  Determine the blkg it's associated with.
  */
-static inline struct blkio_group *pdata_to_blkg(void *pdata,
-						struct blkio_policy_type *pol)
+static inline struct blkio_group *pdata_to_blkg(void *pdata)
 {
 	if (pdata) {
 		struct blkg_policy_data *pd =
@@ -402,7 +399,6 @@ extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
 				       struct request_queue *q);
 struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 				       struct request_queue *q,
-				       enum blkio_policy_id plid,
 				       bool for_root);
 void blkiocg_update_timeslice_used(struct blkio_group *blkg,
 				   struct blkio_policy_type *pol,

block/blk-throttle.c

@@ -107,7 +107,7 @@ static inline struct throtl_grp *blkg_to_tg(struct blkio_group *blkg)
 
 static inline struct blkio_group *tg_to_blkg(struct throtl_grp *tg)
 {
-	return pdata_to_blkg(tg, &blkio_policy_throtl);
+	return pdata_to_blkg(tg);
 }
 
 enum tg_state_flags {
@@ -185,7 +185,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
 	} else {
 		struct blkio_group *blkg;
 
-		blkg = blkg_lookup_create(blkcg, q, BLKIO_POLICY_THROTL, false);
+		blkg = blkg_lookup_create(blkcg, q, false);
 
 		/* if %NULL and @q is alive, fall back to root_tg */
 		if (!IS_ERR(blkg))
@@ -1033,8 +1033,7 @@ int blk_throtl_init(struct request_queue *q)
 	rcu_read_lock();
 	spin_lock_irq(q->queue_lock);
 
-	blkg = blkg_lookup_create(&blkio_root_cgroup, q, BLKIO_POLICY_THROTL,
-				  true);
+	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
 	if (!IS_ERR(blkg))
 		td->root_tg = blkg_to_tg(blkg);
 

block/cfq-iosched.c

@@ -374,7 +374,7 @@ static inline struct cfq_group *blkg_to_cfqg(struct blkio_group *blkg)
 
 static inline struct blkio_group *cfqg_to_blkg(struct cfq_group *cfqg)
 {
-	return pdata_to_blkg(cfqg, &blkio_policy_cfq);
+	return pdata_to_blkg(cfqg);
 }
 
 static inline void cfqg_get(struct cfq_group *cfqg)
@@ -1092,7 +1092,7 @@ static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd,
 	} else {
 		struct blkio_group *blkg;
 
-		blkg = blkg_lookup_create(blkcg, q, BLKIO_POLICY_PROP, false);
+		blkg = blkg_lookup_create(blkcg, q, false);
 		if (!IS_ERR(blkg))
 			cfqg = blkg_to_cfqg(blkg);
 	}
@@ -3523,8 +3523,7 @@ static int cfq_init_queue(struct request_queue *q)
 	rcu_read_lock();
 	spin_lock_irq(q->queue_lock);
 
-	blkg = blkg_lookup_create(&blkio_root_cgroup, q, BLKIO_POLICY_PROP,
-				  true);
+	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
 	if (!IS_ERR(blkg))
 		cfqd->root_group = blkg_to_cfqg(blkg);