percpu_ref: implement percpu_ref_is_dying()
Implement percpu_ref_is_dying() which tests whether the ref is dying
or dead. This is useful to determine the current state when a
percpu_ref is used as a cyclic on/off switch via kill and reinit.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 6a7a670..12c9b48 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -295,6 +295,20 @@
}
/**
+ * percpu_ref_is_dying - test whether a percpu refcount is dying or dead
+ * @ref: percpu_ref to test
+ *
+ * Returns %true if @ref is dying or dead.
+ *
+ * This function is safe to call as long as @ref is between init and exit
+ * and the caller is responsible for synchronizing against state changes.
+ */
+static inline bool percpu_ref_is_dying(struct percpu_ref *ref)
+{
+ return ref->percpu_count_ptr & __PERCPU_REF_DEAD;
+}
+
+/**
* percpu_ref_is_zero - test whether a percpu refcount reached zero
* @ref: percpu_ref to test
*