Hi Biju,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on v5.13]
[cannot apply to ipvs/master linus/master sparc-next/master v5.14-rc1 next-20210714]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Biju-Das/Add-Gigabit-Ethernet-driver-support/20210714-225614
base:    62fb9874f5da54fdb243003b386128037319b219
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/55afee99ed412f19285ddcd388f546d0eec28b5b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Biju-Das/Add-Gigabit-Ethernet-driver-support/20210714-225614
        git checkout 55afee99ed412f19285ddcd388f546d0eec28b5b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/renesas/ravb_main.c:744:17: warning: no previous prototype for 'rgeth_get_skb' [-Wmissing-prototypes]
     744 | struct sk_buff *rgeth_get_skb(struct net_device *ndev,  int q, int entry,
         |                 ^~~~~~~~~~~~~


vim +/rgeth_get_skb +744 drivers/net/ethernet/renesas/ravb_main.c

   742	
   743	/* Packet receive function for Ethernet AVB */
 > 744	struct sk_buff *rgeth_get_skb(struct net_device *ndev,  int q, int entry,
   745				      struct ravb_rx_desc *desc)
   746	{
   747		struct ravb_private *priv = netdev_priv(ndev);
   748		struct sk_buff *skb;
   749	
   750		skb = priv->rx_skb[q][entry];
   751		priv->rx_skb[q][entry] = NULL;
   752		dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
   753				 ALIGN(RGETH_RCV_BUFF_MAX, 16), DMA_FROM_DEVICE);
   754	
   755		return skb;
   756	}
   757	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org