linux-kernel - Re: [PATCH net-next] net: core: Quiet W=1 warnings for unused vars and static functions

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Message-ID: <1412632939.11091.86.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 06 Oct 2014 15:02:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH net-next] net: core: Quiet W=1 warnings for unused vars
 and static functions

On Mon, 2014-10-06 at 14:51 -0700, Joe Perches wrote:
> Reduce noise when compiling W=1.
> 
> All the variables are unused.
> The functions are not called outside of the file so static
> is preferred.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
> 
> John, can you please verify that these gen_stats accesses
> are unnecessary?  I believe the compiler can elide them in
> any case, but I'm not sure what you intended here.

...

> diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
> index 14681b9..01be9cf 100644
> --- a/net/core/gen_stats.c
> +++ b/net/core/gen_stats.c
> @@ -106,13 +106,9 @@ __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
>  	for_each_possible_cpu(i) {
>  		struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
>  		unsigned int start;
> -		__u64 bytes;
> -		__u32 packets;
>  
>  		do {
>  			start = u64_stats_fetch_begin_irq(&bcpu->syncp);
> -			bytes = bcpu->bstats.bytes;
> -			packets = bcpu->bstats.packets;
>  		} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
>  

Well... Please fix the bug for real.





>  		bstats->bytes += bcpu->bstats.bytes;

->

	bstats->bytes += bytes;
	bstats->packets += packets;



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