Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932682AbcLGRgr (ORCPT ); Wed, 7 Dec 2016 12:36:47 -0500 Received: from shards.monkeyblade.net ([184.105.139.130]:36178 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753235AbcLGRgq (ORCPT ); Wed, 7 Dec 2016 12:36:46 -0500 Date: Wed, 07 Dec 2016 12:36:42 -0500 (EST) Message-Id: <20161207.123642.1553217272033137094.davem@davemloft.net> To: santosh.shilimkar@oracle.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection cache usage info From: David Miller In-Reply-To: <6159757e-c799-ee7f-0ee0-c9b3534a4237@oracle.com> References: <20161207.120536.1153607792891600896.davem@davemloft.net> <6159757e-c799-ee7f-0ee0-c9b3534a4237@oracle.com> X-Mailer: Mew version 6.7 on Emacs 24.5 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Wed, 07 Dec 2016 08:37:24 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 563 Lines: 14 From: Santosh Shilimkar 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.