linux-kernel - Re: [PATCH] bridge/netfilter: avoid unused label warning

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Message-ID: <561420DD.70009@cumulusnetworks.com>
Date:	Tue, 6 Oct 2015 21:28:29 +0200
From:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:	Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>,
	Florian Westphal <fw@...len.de>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bridge/netfilter: avoid unused label warning

On 10/06/2015 09:22 PM, Arnd Bergmann wrote:
> With the ARM mini2440_defconfig, the bridge netfilter code gets
> built with both CONFIG_NF_DEFRAG_IPV4 and CONFIG_NF_DEFRAG_IPV6
> disabled, which leads to a harmless gcc warning:
> 
> net/bridge/br_netfilter_hooks.c: In function 'br_nf_dev_queue_xmit':
> net/bridge/br_netfilter_hooks.c:792:2: warning: label 'drop' defined but not used [-Wunused-label]
> 
> This gets rid of the warning by cleaning up the code to avoid
> the respective #ifdefs causing this problem, and replacing them
> with if(IS_ENABLED()) checks. I have verified that the resulting
> object code is unchanged, and an additional advantage is that
> we now get compile coverage of the unused functions in more
> configurations.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: dd302b59bde0 ("netfilter: bridge: don't leak skb in error paths")
> 

I posted a fix for this a couple of days ago, but I like your approach better.
Since mine is not yet applied (I sent it to netfilter-devel only, wasn't sure which
jurisdiction this falls into exactly) we can drop it.
Just for reference my patch is here:
http://patchwork.ozlabs.org/patch/526417/
Pablo, could you please drop it ?

By the way this takes care of another warning about unused variable (nf_bridge), too.
So,

Reviewed-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

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