Re: [PATCH v2] epoll: add nsec timeout support

[Matthew Wilcox]

On Mon, Nov 16, 2020 at 02:54:17PM -0500, Willem de Bruijn wrote:
> > You could also add a compile assert to check that the flag is reserved.
> 
> Like this?
> 
>         /* Check the EPOLL_* constant for consistency.  */
>         BUILD_BUG_ON(EPOLL_CLOEXEC != O_CLOEXEC);
> +        BUILD_BUG_ON(EPOLL_NSTIMEO & EPOLL_RESERVED_FLAGS);

i think you got the sense of that test wrong.  but yes.