[PATCH 016/196] kref: add kref_set()

Greg Kroah-Hartman
2008-01-25T07:19:00Z

From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

This adds kref_set() to the kref api for future use by people who really
know what they are doing with krefs...

From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
include/linux/kref.h | 1 +
lib/kref.c | 15 +++++++++++++--
2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/linux/kref.h b/include/linux/kref.h
index 6fee353..5d18563 100644
--- a/include/linux/kref.h
+++ b/include/linux/kref.h
@@ -24,6 +24,7 @@ struct kref {
atomic_t refcount;
};

+void kref_set(struct kref *kref, int num);
void kref_init(struct kref *kref);
void kref_get(struct kref *kref);
int kref_put(struct kref *kref, void (*release) (struct kref *kref));
diff --git a/lib/kref.c b/lib/kref.c
index a6dc3ec..9ecd6e8 100644
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -15,13 +15,23 @@
#include <linux/module.h>

/**
+ * kref_set - initialize object and set refcount to requested number.
+ * @kref: object in question.
+ * @num: initial reference counter
+ */
+void kref_set(struct kref *kref, int num)
+{
+ atomic_set(&kref->refcount, num);
+ smp_mb();
+}
+
+/**
* kref_init - initialize object.
* @kref: object in question.
*/
void kref_init(struct kref *kref)
{
- atomic_set(&kref->refcount,1);
- smp_mb();
+ kref_set(kref, 1);
}

/**
@@ -61,6 +71,7 @@ int kref_put(struct kref *kref, void (*release)(struct kref *kref))
return 0;
}

+EXPORT_SYMBOL(kref_set);
EXPORT_SYMBOL(kref_init);
EXPORT_SYMBOL(kref_get);
EXPORT_SYMBOL(kref_put);
--
1.5.3.8