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=-1.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,URIBL_BLOCKED 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 3F877ECDE4B for ; Thu, 1 Nov 2018 09:41:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 15A9020657 for ; Thu, 1 Nov 2018 09:32:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="fsro5ZD6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 15A9020657 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727986AbeKASeV (ORCPT ); Thu, 1 Nov 2018 14:34:21 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:55646 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727608AbeKASeV (ORCPT ); Thu, 1 Nov 2018 14:34:21 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id wA19Nl38035120; Thu, 1 Nov 2018 09:31:50 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=mime-version : message-id : date : from : to : cc : subject : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=pItNDgZFIe15JKymUX/BrGnulAnqKxz3iMke+9Sq0y4=; b=fsro5ZD6JdHP3kARz3hXJRng6U78KuFwcrHXRJpdyQBue2JrTNRaXEPUCvULBIve9IsV 64qn6d9i/ddaNg/TrdCsN9OOybOCCC/f3JJ6BoQwdkFrhG2LKvveDu7ZVcNe8ZbK/n3S 5SsQiXi0LsUoBVOaXHTXE2D27kXCJGRloSmP15XLzYckrPjMp9Dnkd5W6q8/q2ja577j 42Zy7yNTxo16yiYn8X5Fikvq18YOg6gGbvM8jsQZfsOMiT3eJ4yIC+uFavc3ULRKdsAD FH2r06UibQGpyGO0xOKk43z4mPx8J9mFVZesD+LZ7Rw4RSOZ+Fr3+MAnZOKVDL9aO6VB +A== Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by aserp2120.oracle.com with ESMTP id 2ncfyq7tmw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 01 Nov 2018 09:31:50 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id wA19Vib3006305 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 1 Nov 2018 09:31:44 GMT Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id wA19VhgO024415; Thu, 1 Nov 2018 09:31:43 GMT MIME-Version: 1.0 Message-ID: Date: Thu, 1 Nov 2018 02:31:43 -0700 (PDT) From: Zhenzhong Duan To: Linux-Kernel Cc: Srinivas REDDY Eeda , , Peterz Subject: [PATCH v2 0/2] Enable retpoline only when compiler support X-Mailer: Zimbra on Oracle Beehive Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9063 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=589 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1811010083 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org According to Peter Zijlstra's suggestion in https://lkml.org/lkml/2018/9/18= /1016, hard bind retpoline with compiler support and remove minimal stuff. Tested with both CONFIG_RETPOLINE enabled and disabled. -v2: Add compiler support check in Kconfig [Masahiro] Drop 3rd patch as __insn_is_indirect_jump() may be used in some corner case= .[PeterZ] Zhenzhong Duan (2): retpolines: Only enable retpoline when compiler support it retpolines: Remove the minimal stuff of retpoline support arch/x86/Kconfig | 6 ++---- arch/x86/Makefile | 4 +--- arch/x86/include/asm/nospec-branch.h | 12 ++++++------ arch/x86/kernel/cpu/bugs.c | 13 ++----------- scripts/Makefile.build | 2 -- 5 files changed, 11 insertions(+), 26 deletions(-) --=20 1.8.3.1