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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3 net-next 0/5] ulp: Generalize ULP infrastructure
Date: Tue, 08 Aug 2017 18:07:23 -0700 (PDT)
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From: Edward Cree <ecree@solarflare.com>
Date: Tue, 8 Aug 2017 21:23:03 +0100

> In any case, if you go with the enum approach and later it _does_ prove
>  necessary to have more flexibility, you can have enum values dynamically
>  assigned (like genetlink manages to do); and programs using the existing
>  fixed IDs will continue to work.

Indeed:

> It's much harder to go the other way...

^^^^ THIS!