linux-kernel - Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection cache usage info

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Message-Id: <20161207.123642.1553217272033137094.davem@davemloft.net>
Date:   Wed, 07 Dec 2016 12:36:42 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     santosh.shilimkar@...cle.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection
 cache usage info

From: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Date: Wed, 7 Dec 2016 09:20:17 -0800

> Newer/Updated tools which can parse this extra info in needs newer
> or an updated kernel which supports and populates these fields.
> 
> As mentioned, this particular option used only in verbose mode so
> am ok to drop this change if its still a concern.

What does the newer tool do on an older kernel if it doesn't see
the fields?  Does it check the size of the structure given back
to it, and conditionally handle the older vs. the newer layout?

It must do this.