On Sat, Dec 28, 2019 at 05:16:49AM +0800, kbuild test robot wrote:
> Hi Theodore,
> 
> I love your patch! Yet something to improve:
> 
>    In file included from mm/fadvise.c:16:0:
>    include/linux/backing-dev.h: In function 'bdi_dev_name':
> >> include/linux/backing-dev.h:513:9: error: implicit declaration of function 'dev_name'; did you mean 'getname'? [-Werror=implicit-function-declaration]
>      return dev_name(bdi->dev);
>             ^~~~~~~~
>             getname

Already fixed in the V2 version of the patch.  (Which I also forgot to label as V2, sigh...)