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=-20.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 9762EC433EF for ; Sat, 11 Sep 2021 15:35:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6874061205 for ; Sat, 11 Sep 2021 15:35:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232509AbhIKPgL (ORCPT ); Sat, 11 Sep 2021 11:36:11 -0400 Received: from pegase2.c-s.fr ([93.17.235.10]:58971 "EHLO pegase2.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230265AbhIKPgJ (ORCPT ); Sat, 11 Sep 2021 11:36:09 -0400 Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4H6GyR4H6fz9sX6; Sat, 11 Sep 2021 17:34:55 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id o_KNaW9TnEo4; Sat, 11 Sep 2021 17:34:55 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4H6GyR2WJPz9sWt; Sat, 11 Sep 2021 17:34:55 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 351398B768; Sat, 11 Sep 2021 17:34:55 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 1Bo0Q-pGQz96; Sat, 11 Sep 2021 17:34:55 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (unknown [192.168.204.127]) by messagerie.si.c-s.fr (Postfix) with ESMTP id F3FE68B763; Sat, 11 Sep 2021 17:34:53 +0200 (CEST) Subject: Re: [PATCH 06/10] powerpc: remove GCC version check for UPD_CONSTR To: Nick Desaulniers , Andrew Morton Cc: Linus Torvalds , Rasmus Villemoes , Nathan Chancellor , Masahiro Yamada , Joe Perches , Arnd Bergmann , Stephen Rothwell , llvm@lists.linux.dev, linux-kernel@vger.kernel.org, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Segher Boessenkool , linuxppc-dev@lists.ozlabs.org References: <20210910234047.1019925-1-ndesaulniers@google.com> <20210910234047.1019925-7-ndesaulniers@google.com> From: Christophe Leroy Message-ID: <10516ec8-2650-3984-76a0-b38245527443@csgroup.eu> Date: Sat, 11 Sep 2021 17:34:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210910234047.1019925-7-ndesaulniers@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr-FR Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 11/09/2021 à 01:40, Nick Desaulniers a écrit : > Now that GCC 5.1 is the minimum supported version, we can drop this > workaround for older versions of GCC. This adversely affected clang, > too. Why do you say that GCC 5.1 is the minimum supported ? As far as I can see, the minimum supported is still 4.9, see https://github.com/torvalds/linux/blob/master/Documentation/process/changes.rst > > Cc: Michael Ellerman > Cc: Benjamin Herrenschmidt > Cc: Paul Mackerras > Cc: Segher Boessenkool > Cc: Christophe Leroy > Cc: linuxppc-dev@lists.ozlabs.org > Signed-off-by: Nick Desaulniers > --- > arch/powerpc/include/asm/asm-const.h | 10 ---------- > 1 file changed, 10 deletions(-) > > diff --git a/arch/powerpc/include/asm/asm-const.h b/arch/powerpc/include/asm/asm-const.h > index 0ce2368bd20f..dbfa5e1e3198 100644 > --- a/arch/powerpc/include/asm/asm-const.h > +++ b/arch/powerpc/include/asm/asm-const.h > @@ -12,16 +12,6 @@ > # define ASM_CONST(x) __ASM_CONST(x) > #endif > > -/* > - * Inline assembly memory constraint > - * > - * GCC 4.9 doesn't properly handle pre update memory constraint "m<>" > - * > - */ > -#if defined(GCC_VERSION) && GCC_VERSION < 50000 > -#define UPD_CONSTR "" > -#else > #define UPD_CONSTR "<>" > -#endif There is no point in keeping UPD_CONSTR if it becomes invariant. You should just replace all instances of UPD_CONSTR with <> and drop UPD_CONSTR completely. Christophe