---

yaml --- r: 230604 b: refs/heads/master c: e4a683c h: refs/heads/master v: v3
git-mirror · Jan 5, 2011 · 83ea468 · 83ea468
1 parent c2cd27a
commit 83ea468
Show file tree

Hide file tree

Showing 3 changed files with 14 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a6e8dc46ff0b7defbfa4f29a71aee263377ec573
+refs/heads/master: e4a683c899cd5a49f8d684a054c95bd115a0c005
diff --git a/trunk/include/linux/kref.h b/trunk/include/linux/kref.h
@@ -23,6 +23,7 @@ struct kref {
 
 void kref_init(struct kref *kref);
 void kref_get(struct kref *kref);
+int kref_test_and_get(struct kref *kref);
 int kref_put(struct kref *kref, void (*release) (struct kref *kref));
 
 #endif /* _KREF_H_ */
diff --git a/trunk/lib/kref.c b/trunk/lib/kref.c
@@ -36,6 +36,18 @@ void kref_get(struct kref *kref)
 	smp_mb__after_atomic_inc();
 }
 
+/**
+ * kref_test_and_get - increment refcount for object only if refcount is not
+ * zero.
+ * @kref: object.
+ *
+ * Return non-zero if the refcount was incremented, 0 otherwise
+ */
+int kref_test_and_get(struct kref *kref)
+{
+	return atomic_inc_not_zero(&kref->refcount);
+}
+
 /**
  * kref_put - decrement refcount for object.
  * @kref: object.