[linux-next:master 1811/2084] mm/slab.h:316:9: error: implicit declaration of function 'virt_to_head_page'

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   888c8375131656144c1605071eab2eb6ac49abc3
commit: 074b6f53c320a81e975c0b5dd79daa5e78a711ba [1811/2084] mm: fault-inject take over bootstrap kmem_cache check
config: i386-randconfig-a0-01271607 (attached as .config)
reproduce:
        git checkout 074b6f53c320a81e975c0b5dd79daa5e78a711ba
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   In file included from mm/failslab.c:3:0:
   mm/slab.h: In function 'cache_from_obj':
>> mm/slab.h:316:9: error: implicit declaration of function 'virt_to_head_page' [-Werror=implicit-function-declaration]
     page = virt_to_head_page(x);
            ^
>> mm/slab.h:316:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     page = virt_to_head_page(x);
          ^
   cc1: some warnings being treated as errors

vim +/virt_to_head_page +316 mm/slab.h

b9ce5ef4 Glauber Costa 2012-12-18  310  	 * to not do even the assignment. In that case, slab_equal_or_root
b9ce5ef4 Glauber Costa 2012-12-18  311  	 * will also be a constant.
b9ce5ef4 Glauber Costa 2012-12-18  312  	 */
b9ce5ef4 Glauber Costa 2012-12-18  313  	if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE))
b9ce5ef4 Glauber Costa 2012-12-18  314  		return s;
b9ce5ef4 Glauber Costa 2012-12-18  315  
b9ce5ef4 Glauber Costa 2012-12-18 @316  	page = virt_to_head_page(x);
b9ce5ef4 Glauber Costa 2012-12-18  317  	cachep = page->slab_cache;
b9ce5ef4 Glauber Costa 2012-12-18  318  	if (slab_equal_or_root(cachep, s))
b9ce5ef4 Glauber Costa 2012-12-18  319  		return cachep;

:::::: The code at line 316 was first introduced by commit
:::::: b9ce5ef49f00daf2254c6953c8d31f79aabccd34 sl[au]b: always get the cache from its page in kmem_cache_free()

:::::: TO: Glauber Costa <glommer@parallels.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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