From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH 1/4] [RFC] net: Explicitly initialize u64_stats_sync
 structures for lockdep
Date: Fri, 27 Sep 2013 02:15:41 -0700
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Cc: John Stultz <john.stultz@linaro.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Mirko Lindner <mlindner@marvell.com>,
	Stephen Hemminger <stephen@networkplumber.org>,
	Roger Luethi <rl@hellgate.ch>,
	Patrick McHardy <kaber@trash.net>,
	Rusty Russell <rusty@rustcorp.com.au>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	James Morris <jmorris@namei.org>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	Wensong Zhang <wensong@linux-vs.org>,
	Simon Horman <horms@verge.net.au>,
	Julian Anastasov <ja@ssi.bg>, Jesse Gross <jesse@nicira.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
	netfilter-devel@vger.kernel.
To: Ingo Molnar <mingo@kernel.org>
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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 !