netdev - Re: [PATCH v2] ip_tunnel: enclose a code block in macro IS_ENABLED(CONFIG

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Date:	Mon, 23 May 2016 20:14:18 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Haishuang Yan <yanhaishuang@...s.chinamobile.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ip_tunnel: enclose a code block in macro
 IS_ENABLED(CONFIG_IPV6)

On Tue, 2016-05-24 at 10:39 +0800, Haishuang Yan wrote:
> For ipv6 case, enclose the code block in macro IS_ENABLED(CONFIG_IPV6).
> 
> ---
> Changes in v2:
>   - Place the "#if IS_ENABLED" block before the "} else if
> (..) {" piece and the "#endif" before the closing brace and this
> becomes much easier to look at.

_Why_ is this patch needed ?

Please describe in the changelog what _actual_ problem you are trying to
address.

We have many points in the kernel using ipv6_get_dsfield() even if
CONFIG_IPV6=n, and it seems fine to me at least.

Thanks.