From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754616AbaE1Ov7 (ORCPT ); Wed, 28 May 2014 10:51:59 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32251 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753918AbaE1Ov4 (ORCPT ); Wed, 28 May 2014 10:51:56 -0400 Date: Wed, 28 May 2014 10:51:40 -0400 From: Vivek Goyal To: Dave Young Cc: "Fleming, Matt" , "bp@alien8.de" , "linux-kernel@vger.kernel.org" , "linux-efi@vger.kernel.org" Subject: Re: [PATCH] export efi.flags to sysfs Message-ID: <20140528145140.GN14863@redhat.com> References: <20140526083935.GA19682@dhcp-16-198.nay.redhat.com> <20140527030058.GB2372@darkstar.nay.redhat.com> <20140528020935.GB2820@darkstar.nay.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140528020935.GB2820@darkstar.nay.redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 28, 2014 at 10:09:35AM +0800, Dave Young wrote: [..] > > I've only vaguely been following along with the other thread, so please > > summarise everything again in your patch. Particularly, I need answers > > to the following questions, > > > > - Are you trying to fix a kexec/kdump regression? > > Somehow it is a regression. Well, it is a *regression*. Previously kdump would work with SGI UV machines as it used "noefi". Now kexec by default thinks that efi is enabled and 1:1 mappings are in place and that does not work with SGI UV machines. So just providing --noefi is not enough. Somebody needs to automatically figure out that this SGI machine does not contain 1:1 mapping and hence need to fall back to old mode. --noefi is good for override. Thanks Vivek