From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933699Ab2AKRZO (ORCPT ); Wed, 11 Jan 2012 12:25:14 -0500 Received: from mga01.intel.com ([192.55.52.88]:9550 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933635Ab2AKRYi (ORCPT ); Wed, 11 Jan 2012 12:24:38 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="106055480" From: "Fenghua Yu" To: "Ingo Molnar" , "Thomas Gleixner" , "H Peter Anvin" , "Linus Torvalds" , "Andrew Morton" , "Asit K Mallick" , "Tony Luck" , "Arjan van de Ven" , "Suresh B Siddha" , "Len Brown" , "Randy Dunlap" , "Srivatsa S. Bhat" , Konrad Rzeszutek Wilk , Peter Zijlstra , "Chen Gong" , "linux-kernel" , "linux-pm" , "x86" Cc: Fenghua Yu Subject: [PATCH v5 11/12] x86/i387.c: Thread xstate is initialized only on CPU0 once Date: Wed, 11 Jan 2012 09:04:52 -0800 Message-Id: <1326301493-28760-12-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 In-Reply-To: <1326301493-28760-1-git-send-email-fenghua.yu@intel.com> References: <1326301493-28760-1-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 739d859..cca99fa 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -107,7 +107,11 @@ 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(); -- 1.6.0.3