netdev - Re: [PATCH net-next] net-ipv6: Fix alleged compiler warning in ipv6_exthdrs

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Message-Id: <20131215.203158.557626779911420893.davem@davemloft.net>
Date:	Sun, 15 Dec 2013 20:31:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hkchu@...gle.com
Cc:	hannes@...essinduktion.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net-ipv6: Fix alleged compiler warning in
 ipv6_exthdrs_len()

From: "H.K. Jerry Chu" <hkchu@...gle.com>
Date: Sun, 15 Dec 2013 09:19:07 -0800

> From: Jerry Chu <hkchu@...gle.com>
> 
> It was reported that Commit 299603e8370a93dd5d8e8d800f0dff1ce2c53d36
> ("net-gro: Prepare GRO stack for the upcoming tunneling support")
> triggered a compiler warning in ipv6_exthdrs_len():
> 
> net/ipv6/ip6_offload.c: In function ‘ipv6_gro_complete’:
> net/ipv6/ip6_offload.c:178:24: warning: ‘optlen’ may be used uninitialized in this function [-Wmaybe-u
>     opth = (void *)opth + optlen;
>     			^
>     net/ipv6/ip6_offload.c:164:22: note: ‘optlen’ was declared here
>     int len = 0, proto, optlen;
>                         ^
> Note that there was no real bug here - optlen was never uninitialized
> before use. (Was the version of gcc I used smarter to not complain?)
> 
> Reported-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Signed-off-by: H.K. Jerry Chu <hkchu@...gle.com>

What is this patch against?

It gets rejects when I try to apply it both with Hannes's patch reverted
and without it reverted.