Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753316AbaA3OIb (ORCPT ); Thu, 30 Jan 2014 09:08:31 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:51971 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751816AbaA3OI3 (ORCPT ); Thu, 30 Jan 2014 09:08:29 -0500 Message-ID: <1391090899.26079.103.camel@shinybook.infradead.org> Subject: Re: [PATCH v2] x86, boot: Fix word-size assumptions in has_eflag () inline asm From: David Woodhouse To: "H. Peter Anvin" Cc: Ingo Molnar , linux-kernel@vger.kernel.org, keescook@chromium.org, tglx@linutronix.de, hpa@linux.intel.com, linux-tip-commits@vger.kernel.org Date: Thu, 30 Jan 2014 14:08:19 +0000 In-Reply-To: References: <1390996897.20153.123.camel@i7.infradead.org> <20140130090902.GA2749@gmail.com> <1391079628.26079.82.camel@shinybook.infradead.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-7DzRq8SVUchO6EasDt9H" X-Mailer: Evolution 3.8.5 (3.8.5-2.fc19) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-7DzRq8SVUchO6EasDt9H Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2014-01-30 at 05:45 -0800, H. Peter Anvin wrote: > This would seem like a job for . Except that's all done on CONFIG_X86_32 which isn't useful for what we are doing here. We could, potentially, *change* so that it actually makes its choices based on whether __x86_64__ is defined? Which would probably work, except for the next horrid corner case I haven't discovered/realised yet :) I think I'm inclined to keep this fairly localised, unless we really see a case for doing it elsewhere in the kernel. Which is unlikely since a bare 'pushf' should always do the right thing except in the weird no-mans-land that is building 16-bit code with a 32-bit compiler. I note that BITS_PER_LONG=3D=3D64 even when building the 16-bit code as par= t of a 64-bit kernel, too. 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