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 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 A8CF2C2BC61 for ; Tue, 30 Oct 2018 06:55:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6124120657 for ; Tue, 30 Oct 2018 06:55:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="nVKnSuEo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6124120657 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 S1727256AbeJ3PrU (ORCPT ); Tue, 30 Oct 2018 11:47:20 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:49224 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726154AbeJ3PrT (ORCPT ); Tue, 30 Oct 2018 11:47:19 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w9U6s2EV110902 for ; Tue, 30 Oct 2018 06:55:04 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=/cD1fwO2hli7g9nGagtj5uNLahU+D5bvAw7qUX1v08g=; b=nVKnSuEoCun6xOMg2y072joWI49JFOAnm+ggeRQp0cQptDF0aDrUMWXWlaI/pH5+UES3 aRwn7kbejSqRs5s/JW32yiF/9VwEyg6HkO/+egrY6wYP51u8Adb/FZc4OEmyXqd2y48l U54KfeDSlnNwdu4rNB/aL7TQuCWbWmiOaSPRe6euW1q4Z0bAEP49kYjXkF+9CmDpBznX YxdsL6WVWdLiBvFMd/yfkrnDgJjr1akJokNEIwbksLXDabtncC6JtJFo0cpUgGef1uR2 zEA9tEYG1Ay/qZYLomJoHqNXoWRzX6e+HxMqQmGiHKYx28zvBaWW9QpjWwOz5diYpXCX ug== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp2130.oracle.com with ESMTP id 2nduckxmbf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 30 Oct 2018 06:55:04 +0000 Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w9U6t4pd017703 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 30 Oct 2018 06:55:04 GMT Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id w9U6t3Cu008468 for ; Tue, 30 Oct 2018 06:55:03 GMT MIME-Version: 1.0 Message-ID: <834642d4-d92c-4502-8d74-66fc19885b43@default> Date: Mon, 29 Oct 2018 23:55:03 -0700 (PDT) From: Zhenzhong Duan To: Linux-Kernel Cc: Srinivas REDDY Eeda Subject: [PATCH 0/3] 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=9061 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=813 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810300060 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_RETPOLIN_SUPPORT enabled and disabled. Zhenzhong Duan (3): retpolines: Only enable retpoline when compiler support it retpolines: Remove the minimal stuff of retpoline support kprobes/x86: Simplify indirect-jump check in retpoline case Documentation/admin-guide/kernel-parameters.txt | 2 +- arch/x86/Kconfig | 8 ++++---- arch/x86/Makefile | 5 +++-- arch/x86/entry/vdso/Makefile | 4 ++-- arch/x86/include/asm/nospec-branch.h | 12 ++++++------ arch/x86/kernel/cpu/bugs.c | 13 ++----------- arch/x86/kernel/kprobes/opt.c | 14 ++++++-------- arch/x86/kernel/vmlinux.lds.S | 2 +- arch/x86/lib/Makefile | 2 +- arch/x86/lib/retpoline.S | 2 ++ scripts/Makefile.build | 2 +- 11 files changed, 29 insertions(+), 37 deletions(-) --=20 1.8.3.1