Hi Hari,

[auto build test ERROR on powerpc/next]
[also build test ERROR on v4.13-rc3 next-20170804]
[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/Hari-Bathini/powerpc-prom-avoid-endian-conversions-for-linux-memory-limit-node/20170804-060315
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-mpc836x_rdk_defconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

Note: the linux-review/Hari-Bathini/powerpc-prom-avoid-endian-conversions-for-linux-memory-limit-node/20170804-060315 HEAD 10b214586e70ec6cd64fea14d0e0997cf74a6fea builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

>> arch/powerpc/kernel/prom_init.c:600:13: error: 'is_substring_param' defined but not used [-Werror=unused-function]
    static bool is_substring_param(const char *cmdline, const char *str)
                ^~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/is_substring_param +600 arch/powerpc/kernel/prom_init.c

   595	
   596	/*
   597	 * Check if str is a suffix of another param as "mem=" could
   598	 * be "iomem=" as well.
   599	 */
 > 600	static bool is_substring_param(const char *cmdline, const char *str)
   601	{
   602		char *p;
   603		bool ret = false;
   604	
   605		if (cmdline == str)
   606			ret = true;
   607		else {
   608			p = (char *)(str - 1);
   609			if (*p == ' ' || *p == '"')
   610				ret = true;
   611		}
   612	
   613		return ret;
   614	}
   615	

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