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

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Message-ID: <1492623683.8661.63.camel@perches.com>
Date:   Wed, 19 Apr 2017 10:41:23 -0700
From:   Joe Perches <joe@...ches.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     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, 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)