linux-kernel - Re: [PATCH 1/3] vxlan: silence one build warning

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Message-ID: <20131025084134.6cfa153a@samsung-9>
Date:	Fri, 25 Oct 2013 08:41:34 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Zhi Yong Wu <zwu.kernel@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/3] vxlan: silence one build warning

On Fri, 25 Oct 2013 15:49:18 +0800
Zhi Yong Wu <zwu.kernel@...il.com> wrote:

> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
> 
> drivers/net/vxlan.c: In function ‘vxlan_sock_add’:
> drivers/net/vxlan.c:2298:11: warning: ‘sock’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> drivers/net/vxlan.c:2275:17: note: ‘sock’ was declared here
>   LD      drivers/net/built-in.o
> 
> Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
> ---
>  drivers/net/vxlan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index 2ef5b62..e15f1af 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -2272,7 +2272,7 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
>  {
>  	struct vxlan_net *vn = net_generic(net, vxlan_net_id);
>  	struct vxlan_sock *vs;
> -	struct socket *sock;
> +	struct socket *sock = NULL;
>  	struct sock *sk;
>  	int rc = 0;
>  	unsigned int h;

This only happens with certain versions of Gcc which have buggy dependency
analysis. It doesn't happen with Gcc 4.7, think it only shows up in 4.4.
I would rather not fix the warning this way since it risks masking later bugs if this code ever changes.
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