Hi Vladimir,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on net/master]

url:    https://github.com/0day-ci/linux/commits/Vladimir-Oltean/Make-DSA-switch-drivers-compatible-with-masters-which-unregister-on-shutdown/20210912-201056
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git f11ee2ad25b22c2ee587045dd6999434375532f7
config: x86_64-randconfig-a004-20210912 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 261cbe98c38f8c1ee1a482fe76511110e790f58a)
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/535bb691a9ce71ade9ad1ce5a5fdae8c2fd46e27
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vladimir-Oltean/Make-DSA-switch-drivers-compatible-with-masters-which-unregister-on-shutdown/20210912-201056
        git checkout 535bb691a9ce71ade9ad1ce5a5fdae8c2fd46e27
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All errors (new ones prefixed by >>):

>> drivers/net/dsa/b53/b53_mmap.c:332:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
   }
   ^
>> drivers/net/dsa/b53/b53_mmap.c:346:14: error: incompatible function pointer types initializing 'void (*)(struct platform_device *)' with an expression of type 'int (struct platform_device *)' [-Werror,-Wincompatible-function-pointer-types]
           .shutdown = b53_mmap_shutdown,
                       ^~~~~~~~~~~~~~~~~
   2 errors generated.


vim +332 drivers/net/dsa/b53/b53_mmap.c

   323	
   324	static int b53_mmap_shutdown(struct platform_device *pdev)
   325	{
   326		struct b53_device *dev = platform_get_drvdata(pdev);
   327	
   328		if (dev)
   329			b53_switch_shutdown(dev);
   330	
   331		platform_set_drvdata(pdev, NULL);
 > 332	}
   333	
   334	static const struct of_device_id b53_mmap_of_table[] = {
   335		{ .compatible = "brcm,bcm3384-switch" },
   336		{ .compatible = "brcm,bcm6328-switch" },
   337		{ .compatible = "brcm,bcm6368-switch" },
   338		{ .compatible = "brcm,bcm63xx-switch" },
   339		{ /* sentinel */ },
   340	};
   341	MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
   342	
   343	static struct platform_driver b53_mmap_driver = {
   344		.probe = b53_mmap_probe,
   345		.remove = b53_mmap_remove,
 > 346		.shutdown = b53_mmap_shutdown,
   347		.driver = {
   348			.name = "b53-switch",
   349			.of_match_table = b53_mmap_of_table,
   350		},
   351	};
   352	

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