linux-kernel - Re: [PATCH tip/core/rcu 07/17] key: Remove extraneous parentheses from rcu_assign

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Date:	Sun, 24 Jun 2012 21:02:50 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 07/17] key: Remove extraneous parentheses
 from rcu_assign_keypointer()

On Fri, Jun 22, 2012 at 10:59:32PM -0700, Paul E. McKenney wrote:
> On Fri, Jun 22, 2012 at 05:04:36PM +0100, David Howells wrote:
> > Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> > 
> > > This commit removes the extraneous parentheses from rcu_assign_keypointer()
> > > so that rcu_assign_pointer() can be wrapped in do-while.
> > 
> > Should it be wrapped in a do-while itself then?
> > 
> > And whilst you're at it, could you wrap PAYLOAD in parentheses?
> 
> Will do!

Before I forget again...  Is this what you had in mind?

							Thanx, Paul

------------------------------------------------------------------------

key: Remove extraneous parentheses from rcu_assign_keypointer()

This commit removes the extraneous parentheses from rcu_assign_keypointer()
so that rcu_assign_pointer() can be wrapped in do-while.  It also wraps
rcu_assign_keypointer() in a do-while and parenthesizes its final argument,
as suggested by David Howells.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@...htriplett.org>

diff --git a/include/linux/key.h b/include/linux/key.h
index 4cd22ed..e3dbc54 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -303,7 +303,9 @@ static inline bool key_is_instantiated(const struct key *key)
 				   rwsem_is_locked(&((struct key *)(KEY))->sem)))
 
 #define rcu_assign_keypointer(KEY, PAYLOAD)				\
-	(rcu_assign_pointer((KEY)->payload.rcudata, PAYLOAD))
+do {									\
+	rcu_assign_pointer((KEY)->payload.rcudata, (PAYLOAD))		\
+while (0)
 
 #ifdef CONFIG_SYSCTL
 extern ctl_table key_sysctls[];

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