From patchwork Tue Nov 13 19:32:48 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fenghua Yu X-Patchwork-Id: 1737431 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 160A6DF280 for ; Wed, 14 Nov 2012 02:36:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932563Ab2KNCeq (ORCPT ); Tue, 13 Nov 2012 21:34:46 -0500 Received: from mga14.intel.com ([143.182.124.37]:49860 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932548Ab2KNCdq (ORCPT ); Tue, 13 Nov 2012 21:33:46 -0500 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga102.ch.intel.com with ESMTP; 13 Nov 2012 18:33:46 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.83,247,1352102400"; d="scan'208";a="217413963" Received: from fenghua-desk.sc.intel.com ([10.3.52.80]) by azsmga001.ch.intel.com with ESMTP; 13 Nov 2012 18:33:45 -0800 From: "Fenghua Yu" To: "Ingo Molnar" , "Thomas Gleixner" , "H Peter Anvin" , "Linus Torvalds" , "Andrew Morton" , "Asit K Mallick" , "Tony Luck" , "Arjan Dan De Ven" , "Suresh B Siddha" , "Len Brown" , "Srivatssa S. Bhat" , "Randy Dunlap" , "Rafael J. Wysocki" , "Chen Gong" , "linux-kernel" , "linux-pm" , "x86" Cc: "Fenghua Yu" Subject: [PATCH v10 11/14] x86, hotplug: The first online processor saves the MTRR state Date: Tue, 13 Nov 2012 11:32:48 -0800 Message-Id: <1352835171-3958-12-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 In-Reply-To: <1352835171-3958-1-git-send-email-fenghua.yu@intel.com> References: <1352835171-3958-1-git-send-email-fenghua.yu@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Fenghua Yu Ask the first online CPU to save mtrr instead of asking BSP. BSP could be offline when mtrr_save_state() is called. Signed-off-by: Fenghua Yu --- arch/x86/kernel/cpu/mtrr/main.c | 9 +++++++-- 1 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c index 6b96110..e4c1a41 100644 --- a/arch/x86/kernel/cpu/mtrr/main.c +++ b/arch/x86/kernel/cpu/mtrr/main.c @@ -695,11 +695,16 @@ void mtrr_ap_init(void) } /** - * Save current fixed-range MTRR state of the BSP + * Save current fixed-range MTRR state of the first cpu in cpu_online_mask. */ void mtrr_save_state(void) { - smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1); + int first_cpu; + + get_online_cpus(); + first_cpu = cpumask_first(cpu_online_mask); + smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1); + put_online_cpus(); } void set_mtrr_aps_delayed_init(void)