Re: [PATCH v1 3/4] can: cast: add driver for CAST CAN controller

[kernel test robot]

Hi William,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master mkl-can-next/testing v6.8-rc2 next-20240129]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/William-Qiu/dt-bindings-vendor-prefixes-Add-cast-vendor-prefix/20240129-114752
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20240129031239.17037-4-william.qiu%40starfivetech.com
patch subject: [PATCH v1 3/4] can: cast: add driver for CAST CAN controller
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20240130/202401300313.9DPa2nuW-lkp@xxxxxxxxx/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 4a39d08908942b2d415db405844cbe4af73e75d4)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240130/202401300313.9DPa2nuW-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401300313.9DPa2nuW-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/net/can/cast_can.c:352:5: warning: no previous prototype for function 'ccan_get_freebuffer' [-Wmissing-prototypes]
     352 | int ccan_get_freebuffer(struct ccan_priv *priv)
         |     ^
   drivers/net/can/cast_can.c:352:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     352 | int ccan_get_freebuffer(struct ccan_priv *priv)
         | ^
         | static 
   1 warning generated.


vim +/ccan_get_freebuffer +352 drivers/net/can/cast_can.c

   351	
 > 352	int ccan_get_freebuffer(struct ccan_priv *priv)
   353	{
   354		/* Get next transmit buffer */
   355		ccan_reigister_set_bit(priv, CCAN_TCTRL_OFFSET, CCAN_SET_TENEXT_MASK);
   356	
   357		if (ccan_ioread8(priv->reg_base + CCAN_TCTRL_OFFSET) & CCAN_SET_TENEXT_MASK)
   358			return -EPERM;
   359	
   360		return 0;
   361	}
   362	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki