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-allyesconfig (attached as .config)
compiler: mips-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: In function 'mips_reserve_elfcorehdr':
>> arch/mips/kernel/setup.c:439:7: error: implicit declaration of function 'is_vmcore_usable' [-Werror=implicit-function-declaration]
     if (!is_vmcore_usable())
          ^~~~~~~~~~~~~~~~
>> arch/mips/kernel/setup.c:443:6: error: 'elfcorehdr_addr' undeclared (first use in this function)
     if (elfcorehdr_addr + elfcorehdr_size >= mips_lowmem_limit) {
         ^~~~~~~~~~~~~~~
   arch/mips/kernel/setup.c:443:6: note: each undeclared identifier is reported only once for each function it appears in
>> arch/mips/kernel/setup.c:443:24: error: 'elfcorehdr_size' undeclared (first use in this function)
     if (elfcorehdr_addr + elfcorehdr_size >= mips_lowmem_limit) {
                           ^~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/is_vmcore_usable +439 arch/mips/kernel/setup.c

   433	{
   434	#ifdef CONFIG_PROC_VMCORE
   435		/*
   436		 * Don't reserve anything if kernel isn't booting after a panic and
   437		 * vmcore is usable (see linux/crash_dump.h for details)
   438		 */
 > 439		if (!is_vmcore_usable())
   440			return;
   441	
   442		/* Check whether the passed address belongs to low memory */
 > 443		if (elfcorehdr_addr + elfcorehdr_size >= mips_lowmem_limit) {
   444			pr_err("Elfcorehdr %08zx @ %pa doesn't belong to low memory",
   445				(size_t)elfcorehdr_size, &elfcorehdr_addr);
   446			return;

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