linux-kernel - Re: [PATCH] net: ipv6: Fix incompatible pointer type warning

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Message-Id: <20130604.171456.2052649822776872955.davem@davemloft.net>
Date:	Tue, 04 Jun 2013 17:14:56 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	emilgoode@...il.com
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, lorenzo@...gle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net: ipv6: Fix incompatible pointer type warning

From: Emil Goode <emilgoode@...il.com>
Date: Mon,  3 Jun 2013 14:21:08 +0200

> This fixes the sparse warning below about assignment from
> incompatible pointer type.
> 
> In the following commit the third argument in function ipv6_chk_addr
> was changed to const and struct nf_ipv6_ops was introduced with
> the third argument of .chk_addr beeing const.
> 
> 2a7851bffb008ff4882eee673da74718997b4265
> ("netfilter: add nf_ipv6_ops hook to fix xt_addrtype with IPv6")
> 
> The below commit introduced the warning as the third argument of
> dummy_ipv6_chk_addr and .ipv6_chk_addr in struct pingv6_ops is
> missing a const.
> 
> 6d0bfe22611602f36617bc7aa2ffa1bbb2f54c67
> ("net: ipv6: Add IPv6 support to the ping socket.")
> 
> Sparse output:
> 
> net/ipv6/ping.c: In function ‘pingv6_init’:
> net/ipv6/ping.c:87:27: warning:
> 	assignment from incompatible pointer type [enabled by default]
> 
> Signed-off-by: Emil Goode <emilgoode@...il.com>

This only happens when you combine net with net-next, therefore your
patch isn't actually relevent to any real GIT tree.

Please make this very clear in the future.