linux-kernel - Re: netlink backwards compatibility in userspace tools

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Message-ID: <CAHmME9rEokbPUVgdtWeEQrdd5bbhZiXLa-Q3PBKouD-dV1Drsg@mail.gmail.com>
Date:   Mon, 9 Oct 2017 13:34:18 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     David Miller <davem@...emloft.net>
Cc:     Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Kahn Gillmor <dkg@...thhorseman.net>
Subject: Re: netlink backwards compatibility in userspace tools

Hi Dave,

That seems wise. Thanks for the advice. A more sophisticated way of
approaching this would be for the kernel to also send a bitmap of
which attributes are "critical" and only warn (or even error) of
_those_ are not understood. But that seems needlessly complex, and so
I think I'll go with your suggestion, and simply warn once with a
shorter message.

Jason