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

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Date:	Sat, 26 Oct 2013 15:06:04 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org,
	linux-kernel mlist <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, Oct 25, 2013 at 11:41 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> 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.
Gcc version is 4.7.2 on my box, this warning took palce.
# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
...
gcc version 4.7.2 20120921 (Red Hat 4.7.2-2) (GCC)


-- 
Regards,

Zhi Yong Wu
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