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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 A69DBC43387 for ; Tue, 18 Dec 2018 16:42:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7816420815 for ; Tue, 18 Dec 2018 16:42:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545151334; bh=77zp0ETMe/MK+/zMC9kzOhxSn/RRH5cMgIJOvSkPfYM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cX/NqHdKb7/qzGmwxAltfEyQQdm5QFk9djKH7ukSfdS/Fz6Ul5p7YW9sevqeJfyGc MDTG7viZBpgbXqrrFg+ADNj8U0rDF0TB+uFQp9kGSRqHNnhl5PG+Yr6xttt/r/Jtcc +Jqf2fKt5FgcXEZ4l6moMXeUXgKM8HMmp36Do5jk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727723AbeLRQmM (ORCPT ); Tue, 18 Dec 2018 11:42:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:39798 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727708AbeLRQmI (ORCPT ); Tue, 18 Dec 2018 11:42:08 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E7139218A2; Tue, 18 Dec 2018 16:42:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545151327; bh=77zp0ETMe/MK+/zMC9kzOhxSn/RRH5cMgIJOvSkPfYM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d+JxfDWyLGubUFEawgPL8GNfigYdnu+GJdonfzBgKni9A0TCYr8Vtgb3xyk+mXQb2 8lIeoO7Vhn3AS3mAMqNS7MEwV6b9uUG2ak6wwS3N4JIKUMtZEg21PTbZX6VBIAnxFd 4qNEdDljsZY3LIRbJlMKZB7W/3axh3Qf83NiLeJk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Meelis Roos , Masahiro Yamada , Zhenzhong Duan , Borislav Petkov , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Sasha Levin , Gi-Oh Kim Subject: [PATCH 4.19 44/44] x86/build: Fix compiler support check for CONFIG_RETPOLINE Date: Tue, 18 Dec 2018 17:39:56 +0100 Message-Id: <20181218163932.542245832@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20181218163927.119623235@linuxfoundation.org> References: <20181218163927.119623235@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Masahiro Yamada commit 25896d073d8a0403b07e6dec56f58e6c33678207 upstream. It is troublesome to add a diagnostic like this to the Makefile parse stage because the top-level Makefile could be parsed with a stale include/config/auto.conf. Once you are hit by the error about non-retpoline compiler, the compilation still breaks even after disabling CONFIG_RETPOLINE. The easiest fix is to move this check to the "archprepare" like this commit did: 829fe4aa9ac1 ("x86: Allow generating user-space headers without a compiler") Reported-by: Meelis Roos Tested-by: Meelis Roos Signed-off-by: Masahiro Yamada Acked-by: Zhenzhong Duan Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Zhenzhong Duan Fixes: 4cd24de3a098 ("x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support") Link: http://lkml.kernel.org/r/1543991239-18476-1-git-send-email-yamada.masahiro@socionext.com Link: https://lkml.org/lkml/2018/12/4/206 Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin Cc: Gi-Oh Kim Signed-off-by: Greg Kroah-Hartman --- arch/x86/Makefile | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -223,9 +223,6 @@ KBUILD_CFLAGS += -fno-asynchronous-unwin # Avoid indirect branches in kernel to deal with Spectre ifdef CONFIG_RETPOLINE -ifeq ($(RETPOLINE_CFLAGS),) - $(error You are building kernel with non-retpoline compiler, please update your compiler.) -endif KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) endif @@ -303,6 +300,13 @@ ifndef CC_HAVE_ASM_GOTO @echo Compiler lacks asm-goto support. @exit 1 endif +ifdef CONFIG_RETPOLINE +ifeq ($(RETPOLINE_CFLAGS),) + @echo "You are building kernel with non-retpoline compiler." >&2 + @echo "Please update your compiler." >&2 + @false +endif +endif archclean: $(Q)rm -rf $(objtree)/arch/i386