linux-kernel - Re: [PATCHv2] ipv4: ipconfig: avoid unused ic_proto

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Date:	Fri, 29 Jan 2016 19:39:32 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	sergei.shtylyov@...entembedded.com,
	linux-arm-kernel@...ts.infradead.org, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] ipv4: ipconfig: avoid unused ic_proto_used symbol

From: Arnd Bergmann <arnd@...db.de>
Date: Thu, 28 Jan 2016 17:39:24 +0100

> When CONFIG_PROC_FS, CONFIG_IP_PNP_BOOTP, CONFIG_IP_PNP_DHCP and
> CONFIG_IP_PNP_RARP are all disabled, we get a warning about the
> ic_proto_used variable being unused:
> 
> net/ipv4/ipconfig.c:146:12: error: 'ic_proto_used' defined but not used [-Werror=unused-variable]
> 
> This avoids the warning, by making the definition conditional on
> whether a dynamic IP configuration protocol is configured. If not,
> we know that the value is always zero, so we can optimize away the
> variable and all code that depends on it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.