linux-kernel - Re: [PATCH v3 tip/core/rcu 05/40] rcu: Semicolon inside RCU

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Message-Id: <20170425210024.GG3956@linux.vnet.ibm.com>
Date:   Tue, 25 Apr 2017 14:00:24 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH v3 tip/core/rcu 05/40] rcu: Semicolon inside RCU_TRACE()
 for rcu.h

On Wed, Apr 19, 2017 at 10:41:23AM -0700, Joe Perches wrote:
> On Wed, 2017-04-19 at 09:58 -0700, Paul E. McKenney wrote:
> > The current use of "RCU_TRACE(statement);" can cause odd bugs, especially
> > where "statement" is a local-variable declaration, as it can leave a
> > misplaced ";" in the source code.  This commit therefore converts these
> > to "RCU_TRACE(statement;)", which avoids the misplaced ";".
> 
> Perhaps instead the single RCU_TRACE macro should be split
> into RCU_TRACE_DECLARE and RCU_TRACE, and then RCU_TRACE
> should use do {} while (0)

Cute trick, but I am having a hard time getting very excited either way.
Thoughts from others?

							Thanx, Paul