Hi Serge,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.9 next-20161216]
[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/Serge-Semin/MIPS-memblock-Remove-bootmem-code-and-switch-to-NO_BOOTMEM/20161219-105045
config: mips-jazz_defconfig (attached as .config)
compiler: mipsel-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

>> arch/mips/kernel/setup.c:273:20: error: 'is_lowmem_and_valid' defined but not used [-Werror=unused-function]
    static bool __init is_lowmem_and_valid(const char *name, phys_addr_t base,
                       ^~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/is_lowmem_and_valid +273 arch/mips/kernel/setup.c

   267	}
   268	early_param("mem", early_parse_mem);
   269	
   270	/*
   271	 * Helper method checking whether passed lowmem region is valid
   272	 */
 > 273	static bool __init is_lowmem_and_valid(const char *name, phys_addr_t base,
   274					       phys_addr_t size)
   275	{
   276		phys_addr_t end = base + size;

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