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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 D8454C49ED7 for ; Sat, 21 Sep 2019 04:48:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A425D20882 for ; Sat, 21 Sep 2019 04:48:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569041305; bh=77X77KHeBAcUIWUblgox8NKnr//eHksiPvmH6Q/PpuA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=0dVmmUi8/njpSbrLVf2NjSOucW3Gw9DJ4KhA9gujzFgbpHCC1O+xHGm/XvRLbh8Kn xkjiAeAkbds679qt4syD5kz8Sld+tDNF3T0ACxhAV7QizvvaFrfHsZlkgoJXIRwkCH y0SmYOK9AoVpOnRKbCIfVF7qDqj6oqMnat89zTS0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725855AbfIUEpO (ORCPT ); Sat, 21 Sep 2019 00:45:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:48156 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725821AbfIUEpN (ORCPT ); Sat, 21 Sep 2019 00:45:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6141D20C01; Sat, 21 Sep 2019 04:45:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569041112; bh=77X77KHeBAcUIWUblgox8NKnr//eHksiPvmH6Q/PpuA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LfxyUsY5qwFjXQujUGU2rLISA+wocs9KxABFTQnySjD7pf36tDcJBdHHNdXy/g6ZN ZNZebe0WcnFBQh5MHZQtc2U0YBEfgATh5tFdgZzrSbiJfkf956paGcl56j2hfDQ9D/ XyjEx2tVxsMVass9C3pQY26gc4wj0HVHj3cPBROs= Date: Sat, 21 Sep 2019 06:45:10 +0200 From: Greg KH To: JH Cc: linux-usb@vger.kernel.org Subject: Re: Failed to connect to 4G modem Message-ID: <20190921044510.GA990793@kroah.com> References: <20190917120258.GB489142@kroah.com> <20190918054744.GA1830105@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Sat, Sep 21, 2019 at 08:10:30AM +1000, JH wrote: > Hi Greg, > > On 9/18/19, Greg KH wrote: > > Otherwise, just use 5.3 now and then 5.4 when it comes out in a few > > months. > > My apology for an off topic question. I discussed with my colleague to > use 5.3, if we cannot wait for 5.4 LTS release, we will do a remote > 5.4 upgrade from 5.3 on air for the product. One of my colleague > warning me that kernel 5.3 and 5.4 LTS will not be a minor upgrade, it > will be major upgrade which will have massive libraries changes. I > don't agree with it, but I could not find kernel document to state > either 5.3 and 5.4 LTS is a major or minor change. What is your > insight view? Appreciate if you could point me a reference to prove my > colleague is wrong. You should never have to update any userspace code or library if the kernel is updated as we guarantee backwards compatibility. If we did break something, please let us know and we will work very hard to fix it. This is a guarantee we made back in 2007 or so, and have been sticking to it since. There is no "major" upgrade issue here, the kernel does a new release every 3 months and changes the number, showing it is "newer" than the previous one. Hope this helps, greg k-h