Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758077Ab3HMSbA (ORCPT ); Tue, 13 Aug 2013 14:31:00 -0400 Received: from terminus.zytor.com ([198.137.202.10]:35437 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757453Ab3HMSa6 (ORCPT ); Tue, 13 Aug 2013 14:30:58 -0400 Message-ID: <520A7B48.3020304@zytor.com> Date: Tue, 13 Aug 2013 11:30:32 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 MIME-Version: 1.0 To: James Bottomley CC: Ingo Molnar , Thomas Gleixner , Linus Torvalds , "linux-efi@vger.kernel.org" , Linux Kernel Mailing List , Matt Fleming Subject: Re: RFC: default CONFIG_EFI_STUB=y References: <52050985.9070107@zytor.com> <1376062345.2087.16.camel@dabdike.int.hansenpartnership.com> <52050D03.4030805@zytor.com> In-Reply-To: <52050D03.4030805@zytor.com> X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1521 Lines: 36 On 08/09/2013 08:38 AM, H. Peter Anvin wrote: > On 08/09/2013 08:32 AM, James Bottomley wrote: >> On Fri, 2013-08-09 at 08:23 -0700, H. Peter Anvin wrote: >>> I would like to change the defaults for CONFIG_EFI and CONFIG_EFI_STUB >>> to y. There is little reason to omit this since EFI now is a >>> significant percentage of all systems. >> >> You didn't actually attach the patch, but I presume this is for 64 bit >> compiles on x86 only? We still have significant problems getting 64 bit >> EFI to interact with 32 bit kernels, so I don't believe we should enable >> CONFIG_EFI globally for all of x86. >> > > Well, it doesn't *solve* the problem with cross-mode, but it should work > as-is for EFI32->32-bit kernel and EFI64->64-bit kernel. For the > cross-mode kernels they will simply not do anything. > > Either way, nothing bad should come from it. The worst thing that will > happen is that the kernel says "I don't have any EFI that I recognize." > > Cross-mode support will always require a secondary bootloader (since as > far as I know there is no concept of "fat binaries" for EFI), but Matt > Fleming is working on genuine cross-mode support for both the boot stub > and (eventually) run time support. > James, does this address your concerns? -hpa -- 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/