[openeuler:OLK-5.10 29971/30000] drivers/net/ipvlan/ipvlan_main.c:431:19: warning: variable 'old_prog' set but not used

[kernel test robot <lkp@intel.com>]

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   33a5644b70e15c265ec94eb3726216950a1476ef
commit: 373ce97bdbb6378acf984656798aff4bb706a447 [29971/30000] ipvlan: support use xdp native mode
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241011/202410111924.i3Aw2F5F-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241011/202410111924.i3Aw2F5F-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410111924.i3Aw2F5F-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/ipvlan/ipvlan_main.c:431:19: warning: variable 'old_prog' set but not used [-Wunused-but-set-variable]
     431 |         struct bpf_prog *old_prog;
         |                          ^
   1 warning generated.


vim +/old_prog +431 drivers/net/ipvlan/ipvlan_main.c

   426	
   427	static int ipvlan_xdp_set(struct net_device *dev, struct bpf_prog *prog,
   428				  struct netlink_ext_ack *extack)
   429	{
   430		struct ipvl_dev *priv = netdev_priv(dev);
 > 431		struct bpf_prog *old_prog;
   432	
   433		old_prog = rtnl_dereference(priv->xdp_prog);
   434		rcu_assign_pointer(priv->xdp_prog, prog);
   435		return 0;
   436	}
   437	

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