From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756845Ab2HYR5P (ORCPT ); Sat, 25 Aug 2012 13:57:15 -0400 Received: from mga14.intel.com ([143.182.124.37]:36728 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751625Ab2HYR4Q (ORCPT ); Sat, 25 Aug 2012 13:56:16 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,311,1344236400"; d="scan'208";a="184878900" 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" , "Chen Gong" , "linux-kernel" , "linux-pm" , "x86" Cc: "Fenghua Yu" Subject: [PATCH v8 11/12] x86/i387.c: Initialize thread xstate only on CPU0 only once Date: Sat, 25 Aug 2012 10:41:27 -0700 Message-Id: <1345916488-8355-12-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 In-Reply-To: <1345916488-8355-1-git-send-email-fenghua.yu@intel.com> References: <1345916488-8355-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fenghua Yu init_thread_xstate() is only called once to avoid overriding xstate_size during boot time or during CPU hotplug. Signed-off-by: Fenghua Yu --- arch/x86/kernel/i387.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index f250431..e4c3a21 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -188,7 +188,11 @@ void __cpuinit fpu_init(void) cr0 |= X86_CR0_EM; write_cr0(cr0); - if (!smp_processor_id()) + /* + * init_thread_xstate is only called once to avoid overriding + * xstate_size during boot time or during CPU hotplug. + */ + if (xstate_size == 0) init_thread_xstate(); mxcsr_feature_mask_init(); -- 1.7.2