randconfig build error with next-20150408, in mm/mempool.c

Building with the attached random configuration file, mm/mempool.c: In function 'check_element': mm/mempool.c:65:3: error: implicit declaration of function 'kmap_atomic' [-Werror=implicit-function-declaration] void *addr = kmap_atomic((struct page *)element); ^ mm/mempool.c:65:16: warning:

randconfig build error with next-20150408, in mm/mempool.c

Building with the attached random configuration file, mm/mempool.c: In function 'check_element': mm/mempool.c:65:3: error: implicit declaration of function 'kmap_atomic' [-Werror=implicit-function-declaration] void *addr = kmap_atomic((struct page *)element); ^ mm/mempool.c:65:16: warning: