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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 DA2E2C28CF6 for ; Sat, 28 Jul 2018 21:54:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C39520862 for ; Sat, 28 Jul 2018 21:54:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9C39520862 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.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 S1731406AbeG1XWU (ORCPT ); Sat, 28 Jul 2018 19:22:20 -0400 Received: from shelob.surriel.com ([96.67.55.147]:44084 "EHLO shelob.surriel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731299AbeG1XWU (ORCPT ); Sat, 28 Jul 2018 19:22:20 -0400 Received: from imladris.surriel.com ([96.67.55.152]) by shelob.surriel.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1fjXA0-0000QZ-Rj; Sat, 28 Jul 2018 17:54:00 -0400 From: Rik van Riel To: linux-kernel@vger.kernel.org Cc: kernel-team@fb.com, peterz@infradead.org, luto@kernel.org, x86@kernel.org, vkuznets@redhat.com, mingo@kernel.org, efault@gmx.de, dave.hansen@intel.com, will.daecon@arm.com, catalin.marinas@arm.com, benh@kernel.crashing.org, Rik van Riel Subject: [PATCH 08/10] arch,mm: add config variable to skip lazy TLB mm refcounting Date: Sat, 28 Jul 2018 17:53:55 -0400 Message-Id: <20180728215357.3249-9-riel@surriel.com> X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180728215357.3249-1-riel@surriel.com> References: <20180728215357.3249-1-riel@surriel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a config variable indicating that this architecture does not require lazy TLB mm refcounting, because lazy TLB mms get shot down instantly at exit_mmap time. Signed-off-by: Rik van Riel --- arch/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/Kconfig b/arch/Kconfig index 1aa59063f1fd..1baf1a176dbf 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -237,6 +237,10 @@ config ARCH_HAS_FORTIFY_SOURCE config ARCH_HAS_SET_MEMORY bool +# Select if arch shoots down lazy TLB mms at exit time, instead of refcounting +config ARCH_NO_ACTIVE_MM_REFCOUNTING + bool + # Select if arch init_task must go in the __init_task_data section config ARCH_TASK_STRUCT_ON_STACK bool -- 2.14.4