Hi Laura,

[auto build test ERROR on v4.5-rc6]
[cannot apply to next-20160304]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Laura-Abbott/mm-page_poison-c-Enable-PAGE_POISONING-as-a-separate-option/20160305-075416
config: sparc64-allyesconfig (attached as .config)
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=sparc64 

All errors (new ones prefixed by >>):

   mm/page_poison.c: In function 'init_page_poisoning':
>> mm/page_poison.c:43:3: error: implicit declaration of function 'debug_pagealloc_enabled' [-Werror=implicit-function-declaration]
      if (!want_page_poisoning && !debug_pagealloc_enabled())
      ^
   cc1: some warnings being treated as errors

vim +/debug_pagealloc_enabled +43 mm/page_poison.c

    37	{
    38		/*
    39		 * page poisoning is debug page alloc for some arches. If either
    40		 * of those options are enabled, enable poisoning
    41		 */
    42		if (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC)) {
  > 43			if (!want_page_poisoning && !debug_pagealloc_enabled())
    44				return;
    45		} else {
    46			if (!want_page_poisoning)

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