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=-12.0 required=3.0 tests=BAYES_00,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 961EDC64E7B for ; Wed, 2 Dec 2020 15:36:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 378EC20B1F for ; Wed, 2 Dec 2020 15:36:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730494AbgLBPf6 (ORCPT ); Wed, 2 Dec 2020 10:35:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:33180 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726113AbgLBPf5 (ORCPT ); Wed, 2 Dec 2020 10:35:57 -0500 From: Andy Lutomirski Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: x86@kernel.org, Mathieu Desnoyers Cc: LKML , Nicholas Piggin , Arnd Bergmann , Anton Blanchard , Andy Lutomirski Subject: [PATCH v2 0/4] membarrier fixes Date: Wed, 2 Dec 2020 07:35:08 -0800 Message-Id: X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all- This is v2, and this time around everything is tagged for -stable. Changes from v1: - patch 1: comment fixes from Mathier - patch 2: improved comments - patch 3: split out as a separate patch - patch 4: now has a proper explanation Mathieu, I think we have to make sync_core sync the caller. See patch 4. Andy Lutomirski (4): x86/membarrier: Get rid of a dubious optimization membarrier: Add an actual barrier before rseq_preempt() membarrier: Explicitly sync remote cores when SYNC_CORE is requested membarrier: Execute SYNC_CORE on the calling thread arch/x86/include/asm/sync_core.h | 9 ++-- arch/x86/mm/tlb.c | 10 ++++- kernel/sched/membarrier.c | 75 ++++++++++++++++++++++++-------- 3 files changed, 71 insertions(+), 23 deletions(-) -- 2.28.0