From: Sabrina Dubroca <s...@queasysnail.net>
Date: Fri, 9 Mar 2018 17:43:21 +0100
> diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
> index f80524396c06..77d0a78cf7d2 100644
> --- a/include/net/ip_fib.h
> +++ b/include/net/ip_fib.h
> @@ -59,6 +59,7 @@ struct fib_nh_exception {
> int fnhe_genid;
> __be32 fnhe_daddr;
> u32 fnhe_pmtu;
> + bool fnhe_mtu_locked;
> __be32 fnhe_gw;
> unsigned long fnhe_expires;
> struct rtable __rcu *fnhe_rth_input;
> diff --git a/include/net/route.h b/include/net/route.h
> index 1eb9ce470e25..729bb5e61e9a 100644
> --- a/include/net/route.h
> +++ b/include/net/route.h
> @@ -64,6 +64,7 @@ struct rtable {
>
> /* Miscellaneous cached information */
> u32 rt_pmtu;
> + bool rt_mtu_locked;
>
> u32 rt_table_id;
>
Please use a flag bit for this, we've worked hard to shrink these
datastructures as much as possible.
I think if you just choose an unused RTCF_* bit (f.e. 0x02000000) for
the state, you can use that because values propagate into the
rtable->rt_flags, and do not propagate out. So you should be able to
use it in this way privately inside the kernel.
Thanks.
