linux-kernel - Re: [PATCH tip/core/rcu 04/17] rcu: Add a gcc-style structure initializer for RCU pointers

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Date:	Fri, 22 Jun 2012 17:02:09 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, 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 04/17] rcu: Add a gcc-style structure initializer for RCU pointers

Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> 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 RCU_POINTER_INITIALIZER() macro that
> is specifically designed for gcc-style initialization.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Acked-by: David Howells <dhowells@...hat.com>
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