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

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Date:	Thu, 26 Sep 2013 12:26:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	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>,
	Ingo Molnar <mingo@...nel.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 Thu, 2013-09-26 at 11:34 -0700, John Stultz wrote:
> In order to enable lockdep on seqcount/seqlock structures, we
> must explicitly initialize any locks.
> 

> diff --git a/include/linux/u64_stats_sync.h b/include/linux/u64_stats_sync.h
> index 8da8c4e..c450e11 100644
> --- a/include/linux/u64_stats_sync.h
> +++ b/include/linux/u64_stats_sync.h
> @@ -67,6 +67,13 @@ struct u64_stats_sync {
>  #endif
>  };
>  
> +
> +#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
> +#define u64_stats_init(syncp)	seqcount_init(syncp.seq)
> +#else
> +#define u64_stats_init(syncp)
> +#endif
> +

I would prefer a function.

static inline void u64_stats_init(struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
	seqcount_init(&syncp->seq);
#endif
}



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