Re: [PATCH] nfds: avoid gettimeofday for nfssvc_boot time

[Arnd Bergmann]

On Thu, Oct 19, 2017 at 12:54 PM, Jeff Layton <jlayton@xxxxxxxxxx> wrote:
>
> I wonder if we'd be better off just using nfssvc_boot.tv_sec as the
> verifier? I don't see us ever calling that ktime_get_real_ts64 more than
> once per second for this purpose, and that would eliminate wraparound.
> That said, wraparound is not a huge concern here anyway, so this is
> certainly fine for now:

I now have the feeling that we had previously had the same discussion
when someone else submitted a similar patch that ended up never getting
merged. I might also be confusing this with a different subsystem that
had the same requirement.

If we want this to be as unique as possible and also never (within
a few hundred years) wrap, we could call ktime_get_real_ns(), which
returns a 64-bit nanoseconds number.

> Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>

Thanks.

     Arnd