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

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Date:   Wed, 07 Dec 2016 12:05:36 -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 08:44:04 -0800

> On 12/7/2016 7:55 AM, David Miller wrote:
>> From: Santosh Shilimkar <santosh.shilimkar@...cle.com>
>> Date: Tue,  6 Dec 2016 20:01:56 -0800
>>
>> What level of compatability exists here?  If we run an old tool on a
>> new
>> kernel, or a new tool on an old kernel, does it work properly?
>>
> Tools repo carries a copy of the header and thats how the old tool and
> new tools have been running with older/newer kernels. There are few
> more
> bits left before I can start using directly kernel header for newer
> tools.
> 
> Moreover this particular parameter is only used for verbose mode which
> isn't used in default options.

That doesn't really answer my question, I think.

Are you saying that one is required to run old tools on old kernels,
and new tools on new kernels, and that's how you have this setup in
your repo?

If so, that really isn't acceptable.  Both old and new tools must work
with all kernel versions.