Re: [PATCH 1/4] [RFC] net: Explicitly initialize u64_stats_syncstructures for lockdep

[Eric Dumazet]

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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