Hi Masahiro,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.0-rc4 next-20190130]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Masahiro-Yamada/powerpc-prom_init-add-__init-markers-to-all-functions/20190131-134035
config: powerpc-mpc837x_mds_defconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 8.2.0-11) 8.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.2.0 make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

>> arch/powerpc/kernel/prom_init.c:511:19: error: 'prom_getproplen' defined but not used [-Werror=unused-function]
    static int __init prom_getproplen(phandle node, const char *pname)
                      ^~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/prom_getproplen +511 arch/powerpc/kernel/prom_init.c

   510	
 > 511	static int __init prom_getproplen(phandle node, const char *pname)
   512	{
   513		return call_prom("getproplen", 2, 1, node, ADDR(pname));
   514	}
   515	

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