./include/linux/err.h:22:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
 #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
                                                 ^
./include/linux/compiler.h:78:42: note: in definition of macro unlikely
 # define unlikely(x) __builtin_expect(!!(x), 0)
                                          ^
mm/mmap.c:3006:6: note: in expansion of macro IS_ERR_VALUE
  if (IS_ERR_VALUE(error))