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percpu-refcount: cosmetic updates

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* 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>
This commit is contained in:
Tejun Heo 2013-06-12 20:43:06 -07:00
parent 6a24474da8
commit ac899061a9
2 changed files with 9 additions and 6 deletions
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8
include/linux/percpu-refcount.h
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@ -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())

7
lib/percpu-refcount.c
View File

@ -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.