Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp2528139imm; Thu, 19 Jul 2018 23:39:21 -0700 (PDT) X-Google-Smtp-Source: AAOMgpdJNPN94IYMawtGzlO/EljwkePF/kMTCpjql/L4Wi0lz0WSETp6XqP+qYKqCOViqWFqfgVJ X-Received: by 2002:a62:1815:: with SMTP id 21-v6mr875555pfy.227.1532068761207; Thu, 19 Jul 2018 23:39:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1532068761; cv=none; d=google.com; s=arc-20160816; b=qqYrmLhZH90j4OdEHQOQsWmUazcyZqBvmto3DsKOwooZS24LiBHkyLo5yKQgDdAb/7 TaycFjAsY7ufqTx5wLlmCVu5J5Jyi2h5zPENH80nsGASyYw0+AyGmE8yyZUFwxK3rlJM om0Bh/U6EYk9wjlheEULH0d2Cr2ouKiWXP9Giz7HR+Y5dhtEVOashWCWAxJ3XZU3/WWC JovB9nXssDd5eICjZqFaP+wtBSzby/BJoi2MRARTSlmcimNfQwCLDRVDhfqvoYCnxueU o4mRaHzSbXctBpZli8vOSZF3tcnotluRMjftPeAb31uttWjge4b52rvM6sTm10FqnBPD sC8A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date :arc-authentication-results; bh=UerRvIqVszGAh8zDZ2j3xfdBLES4k2K3goTaVeKizbI=; b=UVXLtNo+fG6S/KZncjZ+NuDXoPlvd4vZutSosiRbb9nUMXd7PzX6OuZfA90TJswKmC RyGYFyI2M8UuEEGiZHFJIe2rAWg7MDtBhT89GVEGooHSNQjsW5vYxYTDEY4p4CRjfDDU cxuVb4YF8EUhWK/oe8/ySO6Fef7eVE+EHR6mOK/OITSnQITxxtmwsfcCoEgApEn+3+1K OWJuWJp9vx17XsaXXh8NN/SMKzYnA/gwRqS2akKSglDXMtBnJgH2NIXK3tZdUHucAtTU 89bVIzL2TZo6YKE/Q/7FY5KQGMLWirAfnFupwCYQOnlBiMvHiPe6fv6ZIxXosjf8wJ9e wlqg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a16-v6si997357pgw.389.2018.07.19.23.39.06; Thu, 19 Jul 2018 23:39:21 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727041AbeGTHZN (ORCPT + 99 others); Fri, 20 Jul 2018 03:25:13 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:35628 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726533AbeGTHZN (ORCPT ); Fri, 20 Jul 2018 03:25:13 -0400 Received: from p4fea5a5a.dip0.t-ipconnect.de ([79.234.90.90] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1fgP3U-00073R-69; Fri, 20 Jul 2018 08:38:20 +0200 Date: Fri, 20 Jul 2018 08:38:19 +0200 (CEST) From: Thomas Gleixner To: David Wang cc: rjw@rjwysocki.net, mingo@redhat.com, len.brown@intel.com, pavel@ucw.cz, "H. Peter Anvin" , x86@kernel.org, linux-pm@kernel.org, LKML , brucechang@via-alliance.com, cooperyan@zhaoxin.com, qiyuanwang@zhaoxin.com, benjaminpan@viatech.com, lukelin@viacpu.com, timguo@zhaoxin.com, "Rafael J. Wysocki" Subject: Re: [PATCH v3] Optimize C3 entry on Centaur CPUs In-Reply-To: <1527588757-19229-1-git-send-email-davidwang@zhaoxin.com> Message-ID: References: <1527588757-19229-1-git-send-email-davidwang@zhaoxin.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 29 May 2018, David Wang wrote: > For new Centaur CPUs the ucode will take care of the preservation of cache coherence > between CPU cores in C-states regardless of how deep the C-states are. So, it is not > necessary to flush the caches in software befor entering C3. > > Signed-off-by: David Wang Reviewed-by: Thomas Gleixner