From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8D71C433E1 for ; Thu, 23 Jul 2020 09:17:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B3270206F4 for ; Thu, 23 Jul 2020 09:17:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="IFX39bQo"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="apwUhPyj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728001AbgGWJRn (ORCPT ); Thu, 23 Jul 2020 05:17:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725911AbgGWJRn (ORCPT ); Thu, 23 Jul 2020 05:17:43 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6AE1C0619DC for ; Thu, 23 Jul 2020 02:17:42 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1595495860; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=rDOwKC2fAP8MWrkPzgYFdS4Z3n00CBgEPZ5FRmy5cmw=; b=IFX39bQov/ALgcbGLQ0Eq8NHzQplhkLWOvUE9zO+xlmJcF6r3EaMQ1+17d7hetsoxBGDkH jTJvGZNruDrfDAxA20yDQSmbiOxBOQTiA+ZrhS7qq1CpO+EuC9k6nl77NqDALe0Bkh/JFr qjIvFfaSegIjoBrUvrgzR6uPbuy3GgRmIThRqM5GKXYDoVMuPZgFxVzncJFDsNkYPiBO3b jJGO1tMaHCvqmlUuVcGIfoXoXSstNA9w+AblvAfJgMTwTWbmKyUjcgycBPFK5LJUYQo1LP ZmO5XPm3R6vmWhJDRUpI/ppd+taKC+Ldi7IfccnhMgp8MxfEsRrXVnarzz99YQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1595495860; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=rDOwKC2fAP8MWrkPzgYFdS4Z3n00CBgEPZ5FRmy5cmw=; b=apwUhPyjVF5F9GP0Dxv1aCOOX9VvqUScT6Pg3fh1kw6pOyQ6nj0j+/91C8+QcZfY9iBk0f +bVNYbGLn7BUW8Cg== To: Nick Desaulniers , Ingo Molnar , Borislav Petkov Cc: Dennis Zhou , Tejun Heo , Christoph Lameter , x86@kernel.org, "H. Peter Anvin" , Al Viro , Andrew Morton , Peter Zijlstra , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nick Desaulniers , Arnd Bergmann , David Woodhouse , Dmitry Golovin , Linus Torvalds Subject: Re: [PATCH v3 11/11] x86: support i386 with Clang In-Reply-To: <87365izj7i.fsf@nanos.tec.linutronix.de> References: <20200720204925.3654302-1-ndesaulniers@google.com> <20200720204925.3654302-12-ndesaulniers@google.com> <87365izj7i.fsf@nanos.tec.linutronix.de> Date: Thu, 23 Jul 2020 11:17:39 +0200 Message-ID: <87zh7qy4i4.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Thomas Gleixner writes: > Nick Desaulniers writes: > > I'm glad I looked myself at this. > >> We also don't want to swap the use of "=q" with "=r". For 64b, it >> doesn't matter. For 32b, it's possible that a 32b register without a 8b >> lower alias (i.e. ESI, EDI, EBP) is selected which the assembler will >> then reject. > > The above is really garbage. > > We don't want? It's simply not possible to do so, because ... > > 64b,32b,8b. For heavens sake is it too much asked to write a changelog > with understandable wording instead of ambiguous abbreviations? > > There is no maximum character limit for changelogs. Gah. Hit send too fast. >> With this, Clang can finally build an i386 defconfig. With what? I can't find anything which explains the solution at the conceptual level. Sigh. Thanks, tglx