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=-7.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HK_RANDOM_FROM,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, 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 EA986C48BD6 for ; Thu, 27 Jun 2019 05:08:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BDC5E2084B for ; Thu, 27 Jun 2019 05:08:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727191AbfF0FIg (ORCPT ); Thu, 27 Jun 2019 01:08:36 -0400 Received: from mga04.intel.com ([192.55.52.120]:46663 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726578AbfF0FIf (ORCPT ); Thu, 27 Jun 2019 01:08:35 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jun 2019 22:08:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,422,1557212400"; d="scan'208";a="162522642" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.10]) by fmsmga008.fm.intel.com with ESMTP; 26 Jun 2019 22:08:31 -0700 From: Xiaoyao Li To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" Cc: Xiaoyao Li , Fenghua Yu , x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] x86/boot: Make gdt 8-byte aligned Date: Thu, 27 Jun 2019 12:55:25 +0800 Message-Id: <20190627045525.105266-1-xiaoyao.li@linux.intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When loading segment descriptor, it uses lock implicitly. Align gdt here to avoid potential split lock from crossing cache lines case. Signed-off-by: Xiaoyao Li --- arch/x86/boot/compressed/head_64.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index fafb75c6c592..6233ae35d0d9 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -659,6 +659,7 @@ no_longmode: gdt64: .word gdt_end - gdt .quad 0 + .balign 8 gdt: .word gdt_end - gdt .long gdt -- 2.19.1