Building with the attached random configuration file,

mm/slub.c: In function ‘show_slab_objects’:
mm/slub.c:4361:5: error: implicit declaration of function ‘count_partial’ [-Werr
or=implicit-function-declaration]
     x = count_partial(n, count_total);
     ^
cc1: some warnings being treated as errors
make[1]: *** [mm/slub.o] Error 1