From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE8FCC43381 for ; Sat, 16 Mar 2019 23:40:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 81984218D0 for ; Sat, 16 Mar 2019 23:40:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552779618; bh=Me36TdrBigGAiq2BwUvE7lAFhhvBMzkOwanTiXoh0D0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:List-ID:From; b=H8xUJzGNzBUfEtSZaklrB9WmtlMHWHNJ1RWBRws32LUbaLkd6sjXrKC+I7f/YwVup 4TlRmR0u6LjCeRJ1rB6vEBTxAlhfWV4p4480O9l2eaKdroJHK4BBVs1gsznupL+yMe KZygtPNMNfFyN2bC49ygEh60ubPFBxaqF05JSS5E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727080AbfCPXkJ (ORCPT ); Sat, 16 Mar 2019 19:40:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:60898 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726661AbfCPXkJ (ORCPT ); Sat, 16 Mar 2019 19:40:09 -0400 Received: from [192.168.1.112] (c-24-9-64-241.hsd1.co.comcast.net [24.9.64.241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0BD3D218D0; Sat, 16 Mar 2019 23:40:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552779608; bh=Me36TdrBigGAiq2BwUvE7lAFhhvBMzkOwanTiXoh0D0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=GswxlH0iNI785tl9fGyvMWAuHO2c5zuH+QpAqtmXnUKIrztOOX/+v8OAbnwqIokY1 gJ7llq+xYsKw7pgsQx09uxfYZZ5EBeOe69YMhT+1WfV42RhtyktItoDiFJvLf7TYJO Zdod8usN7bsis6Grg1Suja3rPeX0qdly7PNsIyxg= Subject: Re: [PATCH] tools: usb: usbip: adding support for older kernel versions To: David Valleau , LKML Cc: briannorris@chromium.org, linux-usb@vger.kernel.org, Michael Grzeschik , Valentina Manea , Greg Kroah-Hartman , Sasha Levin , shuah References: <20190306214730.6545-1-valleau@chromium.org> From: shuah Message-ID: <44e151af-b6c4-d0af-3ef1-a5632d079915@kernel.org> Date: Sat, 16 Mar 2019 17:39:50 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <20190306214730.6545-1-valleau@chromium.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi David, On 3/6/19 2:47 PM, David Valleau wrote: > The current usbip tool relies on the behavior of the vhci-hcd driver in > order to work correctly. In instances where a newer version of the tool > is used with an older version of the kernel, there are incompatibilities > that can sometimes result in failure. usbip tool is tied to the kernel version. This is reason why it is co-located with the usbip driver in the kernel sources. This is not a typical tool scenario to be able to use new tool on old kernels. I would like to understand the reasons for wanting to run new tool on old kernels. thanks, -- Shuah