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kref: add kref_set()

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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>
This commit is contained in:
Evgeniy Polyakov 2007-12-10 23:03:43 +03:00 committed by Greg Kroah-Hartman
parent 775b64d2b6
commit 41ca28ab2a
2 changed files with 14 additions and 2 deletions
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1
include/linux/kref.h
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@ -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));

15
lib/kref.c
View file

@ -14,14 +14,24 @@
#include <linux/kref.h>
#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);