linux-kernel - [RFC PATCH] rcu: Add sparse check for RCU_INIT

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Date:	Thu, 25 Sep 2014 14:03:34 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org (open list:READ-COPY UPDATE...)
Subject: [RFC PATCH] rcu: Add sparse check for RCU_INIT_POINTER()

Add a sparse check when RCU_INIT_POINTER() is used to assign a non __rcu
annotated pointer. 

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 include/linux/rcupdate.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index a4a819f..a033d8b 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -1047,6 +1047,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
  */
 #define RCU_INIT_POINTER(p, v) \
 	do { \
+		rcu_dereference_sparse(p, __rcu); \
 		p = RCU_INITIALIZER(v); \
 	} while (0)
 
-- 
2.1.0

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