Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753902AbaFXTzc (ORCPT ); Tue, 24 Jun 2014 15:55:32 -0400 Received: from mail-pb0-f50.google.com ([209.85.160.50]:37654 "EHLO mail-pb0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751211AbaFXTza (ORCPT ); Tue, 24 Jun 2014 15:55:30 -0400 From: Andy Lutomirski X-Google-Original-From: Andy Lutomirski Message-ID: <53A9D7AE.8000305@mit.edu> Date: Tue, 24 Jun 2014 12:55:26 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Greg KH , Michael Marineau CC: Alan Stern , linux-kernel@vger.kernel.org Subject: Re: CONFIG_UEVENT_HELPER default References: <20140624183310.GA4955@kroah.com> In-Reply-To: <20140624183310.GA4955@kroah.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/24/2014 11:33 AM, Greg KH wrote: > On Tue, Jun 24, 2014 at 11:30:05AM -0700, Michael Marineau wrote: >> On Jun 24, 2014 11:23 AM, "Alan Stern" wrote: >>> >>> Michael and Greg: >>> >>> The help text for CONFIG_UEVENT_HELPER says (among other things): >>> >>> This should not be used today, because usual systems create >>> many events at bootup or device discovery in a very short time >>> frame. >>> >>> If it shouldn't be used, why does it default to 'y'? >>> >>> Alan Stern >>> >> >> To introduce the option but not change the default behavior. (yet?) I don't >> really have an opinion one way or the other, I just defaulted to being >> conservative. > > Yes, being conservative is good as turning this off with older systems > (like the pathological Fedora 3 system that some kernel developers still > use for testing), would result in a non-booting box. So if you know > that your system is "new enough", it's safe to turn off, but if you have > a doubt, leave it on to be safe. As far as I know, there's no real requirement that a defconfig kernel be able to boot old userspace. We want an oldconfig kernel to be able to boot old userspace, but changing the default won't affect that. For example, a defconfig kernel won't boot opensuse 9. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/