linux-kernel - Re: [PATCH tip/core/rcu 04/14] rcu: Add a gcc-style structure initializer for RCU pointers

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Message-ID: <20120615215021.GV31184@leaf>
Date:	Fri, 15 Jun 2012 14:50:21 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 04/14] rcu: Add a gcc-style structure
 initializer for RCU pointers

On Fri, Jun 15, 2012 at 01:48:13PM -0700, Josh Triplett wrote:
> On Fri, Jun 15, 2012 at 01:13:05PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > 
> > RCU_INIT_POINTER() returns a value that is never used, and which should
> > be abolished due to terminal ugliness:
> > 
> > 	q = RCU_INIT_POINTER(global_p, p);
> > 
> > However, there are two uses that cannot be handled by a do-while
> > formulation because they do gcc-style initialization:
> > 
> > 	RCU_INIT_POINTER(.real_cred, &init_cred),
> > 	RCU_INIT_POINTER(.cred, &init_cred),
> > 
> > This usage is clever, but not necessarily the nicest approach.  This
> > commit therefore creates an INIT_RCU_POINTER() macro that is specifically
> > designed for gcc-style initialization.
> 
> The concept seems fine, but the names seem entirely non-obvious.
> RCU_INIT_POINTER versus INIT_RCU_POINTER?

Suggestion: RCU_POINTER_INITIALIZER, following the example of many other
*_INITIALIZER macros elsewhere in the kernel.

- Josh Triplett
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