percpu-refcount: cosmetic updates

* s/percpu_ref_release/percpu_ref_func_t/ as it's customary to have _t
  postfix for types and the type is gonna be used for a different type
  of callback too.

* Add @ARG to function comments.

* Drop unnecessary and unaligned indentation from percpu_ref_init()
  function comment.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Kent Overstreet <koverstreet@google.com>

include/linux/percpu-refcount.h

@@ -51,7 +51,7 @@
 #include <linux/rcupdate.h>
 
 struct percpu_ref;
-typedef void (percpu_ref_release)(struct percpu_ref *);
+typedef void (percpu_ref_func_t)(struct percpu_ref *);
 
 struct percpu_ref {
 	atomic_t		count;
@@ -62,11 +62,11 @@ struct percpu_ref {
 	 * percpu_ref_kill_rcu())
 	 */
 	unsigned __percpu	*pcpu_count;
-	percpu_ref_release	*release;
+	percpu_ref_func_t	*release;
 	struct rcu_head		rcu;
 };
 
-int percpu_ref_init(struct percpu_ref *, percpu_ref_release *);
+int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release);
 void percpu_ref_kill(struct percpu_ref *ref);
 
 #define PCPU_STATUS_BITS	2
@@ -78,6 +78,7 @@ void percpu_ref_kill(struct percpu_ref *ref);
 
 /**
  * percpu_ref_get - increment a percpu refcount
+ * @ref: percpu_ref to get
  *
  * Analagous to atomic_inc().
   */
@@ -99,6 +100,7 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
 
 /**
  * percpu_ref_put - decrement a percpu refcount
+ * @ref: percpu_ref to put
  *
  * Decrement the refcount, and if 0, call the release function (which was passed
  * to percpu_ref_init())

lib/percpu-refcount.c

@@ -33,8 +33,8 @@
 
 /**
  * percpu_ref_init - initialize a percpu refcount
- * @ref:	ref to initialize
- * @release:	function which will be called when refcount hits 0
+ * @ref: percpu_ref to initialize
+ * @release: function which will be called when refcount hits 0
  *
  * Initializes the refcount in single atomic counter mode with a refcount of 1;
  * analagous to atomic_set(ref, 1).
@@ -42,7 +42,7 @@
  * Note that @release must not sleep - it may potentially be called from RCU
  * callback context by percpu_ref_kill().
  */
-int percpu_ref_init(struct percpu_ref *ref, percpu_ref_release *release)
+int percpu_ref_init(struct percpu_ref *ref, percpu_ref_func_t *release)
 {
 	atomic_set(&ref->count, 1 + PCPU_COUNT_BIAS);
 
@@ -98,6 +98,7 @@ static void percpu_ref_kill_rcu(struct rcu_head *rcu)
 
 /**
  * percpu_ref_kill - safely drop initial ref
+ * @ref: percpu_ref to kill
  *
  * Must be used to drop the initial ref on a percpu refcount; must be called
  * precisely once before shutdown.