From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 16 May 2012 22:42:30 +0000 (-0700)
Subject: rcu: Remove return value from RCU_INIT_POINTER()
X-Git-Tag: next-20120724~139^2^2~2^3~12
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d1b88eb9e3bccaa43fb5d1bde1cbe210b3434731;p=karo-tx-linux.git

rcu: Remove return value from RCU_INIT_POINTER()

The return value from RCU_INIT_POINTER() is not used, and using it
would be quite ugly, for example:

	q = RCU_INIT_POINTER(global_p, p);

To prevent this sort of ugliness from appearing, this commit wraps
RCU_INIT_POINTER() in a do-while loop.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: David Howells <dhowells@redhat.com>
---

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index ffe24c09e53d..abf44d89c6ce 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -903,7 +903,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
  * the reader-accessible portions of the linked structure.
  */
 #define RCU_INIT_POINTER(p, v) \
-		p = (typeof(*v) __force __rcu *)(v)
+	do { \
+		p = (typeof(*v) __force __rcu *)(v); \
+	} while (0)
 
 /**
  * RCU_POINTER_INITIALIZER() - statically initialize an RCU protected pointer