From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756582Ab3FCBYN (ORCPT ); Sun, 2 Jun 2013 21:24:13 -0400 Received: from blu0-omc2-s37.blu0.hotmail.com ([65.55.111.112]:42331 "EHLO blu0-omc2-s37.blu0.hotmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755323Ab3FCBYC convert rfc822-to-8bit (ORCPT ); Sun, 2 Jun 2013 21:24:02 -0400 X-Greylist: delayed 369 seconds by postgrey-1.27 at vger.kernel.org; Sun, 02 Jun 2013 21:24:02 EDT X-TMN: [xmjdcG6BFVfKub3fpq4oLdXw8a3qxkUl] X-Originating-Email: [yuhongbao_386@hotmail.com] Message-ID: From: Yuhong Bao To: "H. Peter Anvin" , Linus Torvalds CC: "Pierre-Loup A. Griffais" , Johannes Weiner , Rik van Riel , Linux Kernel Mailing List , "sonnyrao@chromium.org" , KAMEZAWA Hiroyuki Subject: RE: IO regression after ab8fabd46f on x86 kernels with high memory Date: Sun, 2 Jun 2013 18:17:51 -0700 Importance: Normal In-Reply-To: <518AA321.6070900@zytor.com> References: <517B1153.8000401@valvesoftware.com> <517B2FB4.30605@redhat.com> <20130427024248.GA1229@cmpxchg.org> <517EEBD1.503@valvesoftware.com> ,<518AA321.6070900@zytor.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT MIME-Version: 1.0 X-OriginalArrivalTime: 03 Jun 2013 01:17:52.0971 (UTC) FILETIME=[2BAE89B0:01CE5FF8] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > We kernel guys have been asking the distros to ship 64-bit kernels even > in their 32-bit distros for many years, but concerns of compat issues > and the desire to deprecate 32-bit userspace seems to have kept that > from happening. And now there is another reason: to call 64-bit EFI runtime services. In retrospect, I would have stuck with 32-bit EFI with 64-bit kernels calling runtime services in compatibility mode, but of course it is too late for that now. Yuhong Bao