linux-kernel - [PATCH 2/5] percpu-ref: introduce percpu_ref

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Date:	Thu, 12 Jun 2014 14:31:47 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: [PATCH 2/5] percpu-ref: introduce percpu_ref_alive()

This is used to check if the percpu_ref has been killed.

Signed-off-by: Li Zefan <lizefan@...wei.com>
---
 include/linux/percpu-refcount.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index dba35c4..1d5f2b3 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -96,6 +96,17 @@ static inline void percpu_ref_kill(struct percpu_ref *ref)
 #define REF_STATUS(count)	(((unsigned long) count) & PCPU_STATUS_MASK)
 
 /**
+ * percpu_ref_alive - check if the ref has been killed
+ * @ref: percpu_ref to check
+ *
+ * Return true if percpu_ref_kill() has been called to drop the initial ref.
+ */
+static inline bool percpu_ref_alive(struct percpu_ref *ref)
+{
+	return !(REF_STATUS(ref->pcpu_count) == PCPU_REF_DEAD);
+}
+
+/**
  * percpu_ref_get - increment a percpu refcount
  * @ref: percpu_ref to get
  *
-- 
1.8.0.2

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