Andrew Morton <akpm@linux-foundation.org> 于2019年10月12日周六 上午10:19写道：

>
> ./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))
>
>
Thanks for your review.
I will send a v2.