[frank-w-bpi-r2-4.14:7.1-main 166/166] include/linux/pcs/pcs.h:95:12: warning: 'unregister_fwnode_pcs_notifier' defined but not used

[frank-w-bpi-r2-4.14:7.1-main 166/166] include/linux/pcs/pcs.h:95:12: warning: 'unregister_fwnode_pcs_notifier' defined but not used

[kernel test robot]

tree:   https://github.com/frank-w/BPI-R2-4.14 7.1-main
head:   6e50e153eb2b19f7ccc5aad3545bee4a7b6faea0
commit: 7e58cf54169b7bb649742efbbf4a76f2185f07db [166/166] net: ethernet: mediatek: mtkmux: harden mux/phylink lifecycle
config: sh-randconfig-002-20260629 (https://download.01.org/0day-ci/archive/20260629/202606291356.YmL2vpUv-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260629/202606291356.YmL2vpUv-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/202606291356.YmL2vpUv-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/ethernet/mediatek/mtk_eth_soc.c:25:
   include/linux/pcs/pcs.h:107:1: warning: 'fwnode_phylink_pcs_get_from_fwnode' defined but not used [-Wunused-function]
     107 | fwnode_phylink_pcs_get_from_fwnode(struct fwnode_handle *fwnode,
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/pcs/pcs.h:95:12: warning: 'unregister_fwnode_pcs_notifier' defined but not used [-Wunused-function]
      95 | static int unregister_fwnode_pcs_notifier(struct notifier_block *nb)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/pcs/pcs.h:90:12: warning: 'register_fwnode_pcs_notifier' defined but not used [-Wunused-function]
      90 | static int register_fwnode_pcs_notifier(struct notifier_block *nb)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   {standard input}: Assembler messages:
   {standard input}:8103: Error: offset to unaligned destination
   {standard input}:9134: Error: offset to unaligned destination

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for MFD_STMFX
   Depends on [n]: HAS_IOMEM [=y] && I2C [=y] && OF [=n]
   Selected by [y]:
   - PINCTRL_STMFX [=y] && PINCTRL [=y] && I2C [=y] && HAS_IOMEM [=y]


vim +/unregister_fwnode_pcs_notifier +95 include/linux/pcs/pcs.h

    94	
  > 95	static int unregister_fwnode_pcs_notifier(struct notifier_block *nb)
    96	{
    97		return -EOPNOTSUPP;
    98	}
    99	
   100	static inline struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwnode,
   101							 int index)
   102	{
   103		return ERR_PTR(-ENOENT);
   104	}
   105	
   106	static struct phylink_pcs *
 > 107	fwnode_phylink_pcs_get_from_fwnode(struct fwnode_handle *fwnode,
   108					   struct fwnode_handle *pcs_fwnode)
   109	{
   110		return ERR_PTR(-ENOENT);
   111	}
   112	

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