[PATCH] net: core: fix unused variable sparse warning

[PATCH] net: core: fix unused variable sparse warning

[Cong Ding]

the variables zero and unres_qlen_max are only used when CONFIG_SYSCTL is
defined, otherwise it causes the following sparse warning when we turn on
CONFIG_SYSCTL.

Signed-off-by: Cong Ding <dinggnu@gmail.com>
---
 net/core/neighbour.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 36fc692..4a15278 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -62,8 +62,10 @@ static void __neigh_notify(struct neighbour *n, int type, int flags);
 static void neigh_update_notify(struct neighbour *neigh);
 static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
 
+#ifdef CONFIG_SYSCTL
 static int zero;
 static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN);
+#endif
 
 static struct neigh_table *neigh_tables;
 #ifdef CONFIG_PROC_FS
-- 
1.7.4.5

Re: [PATCH] net: core: fix unused variable sparse warning

[Cong Ding]

On Fri, Dec 07, 2012 at 12:06:44AM +0000, Cong Ding wrote:
> the variables zero and unres_qlen_max are only used when CONFIG_SYSCTL is
> defined, otherwise it causes the following sparse warning when we turn on
> CONFIG_SYSCTL.
sorry for disturbing again, the sparse warning is
net/core/neighbour.c:65:12: warning: ‘zero’ defined but not used [-Wunused-variable]
net/core/neighbour.c:66:12: warning: ‘unres_qlen_max’ defined but not used [-Wunused-variable]

it happens if we turn off CONFIG_SYSCTL.

> 
> Signed-off-by: Cong Ding <dinggnu@gmail.com>
> ---
>  net/core/neighbour.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 36fc692..4a15278 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -62,8 +62,10 @@ static void __neigh_notify(struct neighbour *n, int type, int flags);
>  static void neigh_update_notify(struct neighbour *neigh);
>  static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
>  
> +#ifdef CONFIG_SYSCTL
>  static int zero;
>  static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN);
> +#endif
>  
>  static struct neigh_table *neigh_tables;
>  #ifdef CONFIG_PROC_FS
> -- 
> 1.7.4.5
> 

Re: [PATCH] net: core: fix unused variable sparse warning

[David Miller]

From: Cong Ding <dinggnu@gmail.com>
Date: Fri, 7 Dec 2012 00:15:47 +0000

> On Fri, Dec 07, 2012 at 12:06:44AM +0000, Cong Ding wrote:
>> the variables zero and unres_qlen_max are only used when CONFIG_SYSCTL is
>> defined, otherwise it causes the following sparse warning when we turn on
>> CONFIG_SYSCTL.
> sorry for disturbing again, the sparse warning is
> net/core/neighbour.c:65:12: warning: ‘zero’ defined but not used [-Wunused-variable]
> net/core/neighbour.c:66:12: warning: ‘unres_qlen_max’ defined but not used [-Wunused-variable]
> 
> it happens if we turn off CONFIG_SYSCTL.

A patch for this has already in my tree for nearly a whole day.

Re: [PATCH] net: core: fix unused variable sparse warning

[Shan Wei]

Cong Ding said, at 2012/12/7 8:15:
> On Fri, Dec 07, 2012 at 12:06:44AM +0000, Cong Ding wrote:
>> the variables zero and unres_qlen_max are only used when CONFIG_SYSCTL is
>> defined, otherwise it causes the following sparse warning when we turn on
>> CONFIG_SYSCTL.
> sorry for disturbing again, the sparse warning is
> net/core/neighbour.c:65:12: warning: ‘zero’ defined but not used [-Wunused-variable]
> net/core/neighbour.c:66:12: warning: ‘unres_qlen_max’ defined but not used [-Wunused-variable]
> 
> it happens if we turn off CONFIG_SYSCTL.

It has been fixed yesterday.
see b93196dc5af7729ff7cc50d3d322ab1a364aa14f

> 
>>
>> Signed-off-by: Cong Ding <dinggnu@gmail.com>
>> ---
>>  net/core/neighbour.c |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
>> index 36fc692..4a15278 100644
>> --- a/net/core/neighbour.c
>> +++ b/net/core/neighbour.c
>> @@ -62,8 +62,10 @@ static void __neigh_notify(struct neighbour *n, int type, int flags);
>>  static void neigh_update_notify(struct neighbour *neigh);
>>  static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
>>  
>> +#ifdef CONFIG_SYSCTL
>>  static int zero;
>>  static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN);
>> +#endif
>>  
>>  static struct neigh_table *neigh_tables;
>>  #ifdef CONFIG_PROC_FS
>> -- 
>> 1.7.4.5
>>
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Re: [PATCH] net: core: fix unused variable sparse warning

[Cong Wang]

On Fri, 07 Dec 2012 at 00:06 GMT, Cong Ding <dinggnu@gmail.com> wrote:
> the variables zero and unres_qlen_max are only used when CONFIG_SYSCTL is
> defined, otherwise it causes the following sparse warning when we turn on
> CONFIG_SYSCTL.
>

commit b93196dc5af7729ff7cc50d3d322ab1a364aa14f
Author: Cong Wang <amwang@redhat.com>
Date:   Thu Dec 6 10:04:04 2012 +0800

    net: fix some compiler warning in net/core/neighbour.c
        
    net/core/neighbour.c:65:12: warning: 'zero' defined but
not used [-Wunused-variable]
    net/core/neighbour.c:66:12: warning: 'unres_qlen_max' defined but
not used [-Wunused-variable]
    
    These variables are only used when CONFIG_SYSCTL is defined,
    so move them under #ifdef CONFIG_SYSCTL.
	        
    Reported-by: Fengguang Wu <fengguang.wu@intel.com>
    Signed-off-by: Cong Wang <amwang@redhat.com>
    Acked-by: Shan Wei <davidshan@tencent.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>