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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 A08C4C43382 for ; Thu, 27 Sep 2018 18:56:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 614D5216FA for ; Thu, 27 Sep 2018 18:56:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 614D5216FA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.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 S1728744AbeI1BQR (ORCPT ); Thu, 27 Sep 2018 21:16:17 -0400 Received: from terminus.zytor.com ([198.137.202.136]:57017 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727320AbeI1BQR (ORCPT ); Thu, 27 Sep 2018 21:16:17 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id w8RItrBC130523 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 27 Sep 2018 11:55:53 -0700 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id w8RItqVQ130520; Thu, 27 Sep 2018 11:55:52 -0700 Date: Thu, 27 Sep 2018 11:55:52 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Peter Zijlstra Message-ID: Cc: dave.hansen@intel.com, tglx@linutronix.de, peterz@infradead.org, bin.yang@intel.com, mark.gross@intel.com, mingo@kernel.org, linux-kernel@vger.kernel.org, hpa@zytor.com Reply-To: mark.gross@intel.com, mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, bin.yang@intel.com, peterz@infradead.org, dave.hansen@intel.com In-Reply-To: <20180919085948.195633798@infradead.org> References: <20180919085948.195633798@infradead.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/mm] x86/mm/cpa: Optimize __cpa_flush_range() Git-Commit-ID: 7904ba8a66f400182a204893c92098994e22a88d X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 7904ba8a66f400182a204893c92098994e22a88d Gitweb: https://git.kernel.org/tip/7904ba8a66f400182a204893c92098994e22a88d Author: Peter Zijlstra AuthorDate: Wed, 19 Sep 2018 10:50:24 +0200 Committer: Thomas Gleixner CommitDate: Thu, 27 Sep 2018 20:39:42 +0200 x86/mm/cpa: Optimize __cpa_flush_range() If we IPI for WBINDV, then we might as well kill the entire TLB too. But if we don't have to invalidate cache, there is no reason not to use a range TLB flush. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Reviewed-by: Dave Hansen Cc: Bin Yang Cc: Mark Gross Link: https://lkml.kernel.org/r/20180919085948.195633798@infradead.org --- arch/x86/mm/pageattr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index dc552824e86a..62bb30b4bd2a 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -291,7 +291,7 @@ static bool __cpa_flush_range(unsigned long start, int numpages, int cache) WARN_ON(PAGE_ALIGN(start) != start); - if (!static_cpu_has(X86_FEATURE_CLFLUSH)) { + if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) { cpa_flush_all(cache); return true; }