vserver 2.0 rc7

[linux-2.6.git] / lib / kref.c

diff --git a/lib/kref.c b/lib/kref.c
index 2218b7a..0d07cc3 100644 (file)
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -42,14 +42,21 @@ void kref_get(struct kref *kref)
  *          in as this function.
  *
  * Decrement the refcount, and if 0, call release().
+ * Return 1 if the object was removed, otherwise return 0.  Beware, if this
+ * function returns 0, you still can not count on the kref from remaining in
+ * memory.  Only use the return value if you want to see if the kref is now
+ * gone, not present.
  */
-void kref_put(struct kref *kref, void (*release) (struct kref *kref))
+int kref_put(struct kref *kref, void (*release)(struct kref *kref))
 {
        WARN_ON(release == NULL);
        WARN_ON(release == (void (*)(struct kref *))kfree);
 
-       if (atomic_dec_and_test(&kref->refcount))
+       if (atomic_dec_and_test(&kref->refcount)) {
                release(kref);
+               return 1;
+       }
+       return 0;
 }
 
 EXPORT_SYMBOL(kref_init);