netdev - Re: [PATCH 1/4] [RFC] net: Explicitly initialize u64_stats

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Message-ID: <1380273341.30872.1.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Fri, 27 Sep 2013 02:15:41 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Mirko Lindner <mlindner@...vell.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Roger Luethi <rl@...lgate.ch>,
	Patrick McHardy <kaber@...sh.net>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	Julian Anastasov <ja@....bg>, Jesse Gross <jesse@...ira.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 1/4] [RFC] net: Explicitly initialize u64_stats_sync
 structures for lockdep

On Fri, 2013-09-27 at 07:44 +0200, Ingo Molnar wrote:

> C cannot pass along symbolic names, unfortunately, so we are stuck with 
> 1970's tech and the C preprocessor.
> 

Yes, I realized that a bit too late.

> There's a way to make such macros look a tiny bit more structured and thus 
> be more palatable:
> 
> #if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
> # define u64_stats_init(syncp) seqcount_init(syncp.seq)
> #else
> # define u64_stats_init(syncp)
> #endif
> 
> Note, the 'else' branch should probably be:
> 
> # define u64_stats_init(syncp) do { } while (0)

Yes, this is better ;)

Thanks !


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