From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v2] net: remove unimplemented RTNH_F_PERVASIVE
Date: Tue, 05 Apr 2016 19:57:59 -0400 (EDT)
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From: Quentin Armitage <quentin@armitage.org.uk>
Date: Sat,  2 Apr 2016 17:51:28 +0100

> Linux 2.1.68 introduced RTNH_F_PERVASIVE, but it had no implementation
> and couldn't be enabled since the required config parameter wasn't in
> any Kconfig file (see commit d088dde7b196 ("ipv4: obsolete config in
> kernel source (IP_ROUTE_PERVASIVE)")).
> 
> This commit removes all remaining references to RTNH_F_PERVASIVE.
> Although this will cause userspace applications that were using the
> flag to fail to build, they will be alerted to the fact that using
> RTNH_F_PERVASIVE was not achieving anything.
> 
> Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>

Can't really delete values like this from user visible headers.  It
can break the build.

What if some library or tool has a table translating RTNH_F_* values
into strings to display to the user?  Those sources will stop building
if I apply your changes.