From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756143Ab1KDWWs (ORCPT ); Fri, 4 Nov 2011 18:22:48 -0400 Received: from mga02.intel.com ([134.134.136.20]:32977 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754574Ab1KDWVO (ORCPT ); Fri, 4 Nov 2011 18:21:14 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.67,352,1309762800"; d="scan'208";a="71337197" From: "Fenghua Yu" To: "Thomas Gleixner" , "H Peter Anvin" , "Ingo Molnar" , "Linus Torvalds" , "Andrew Morton" , "Tony Luck" , "Suresh B Siddha" , "Len Brown" , "Srivatsa S. Bhat" , Peter Zijlstra Cc: "linux-kernel" , "Fenghua Yu" Subject: [PATCH 3/9] x86/i387.c: Thread xstate is initialized only on BSP once Date: Fri, 4 Nov 2011 15:03:55 -0700 Message-Id: <1320444241-834-4-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 In-Reply-To: <1320444241-834-1-git-send-email-fenghua.yu@intel.com> References: <1320444241-834-1-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 on BSP once to avoid to override xstate_size. Signed-off-by: Fenghua Yu --- arch/x86/kernel/i387.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 739d859..f721a61 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -93,6 +93,7 @@ void __cpuinit fpu_init(void) { unsigned long cr0; unsigned long cr4_mask = 0; + static int once = 1; if (cpu_has_fxsr) cr4_mask |= X86_CR4_OSFXSR; @@ -107,8 +108,14 @@ void __cpuinit fpu_init(void) cr0 |= X86_CR0_EM; write_cr0(cr0); - if (!smp_processor_id()) + /* + * init_thread_xstate is only called on BSP once to avoid to override + * xstate_size. + */ + if (!smp_processor_id() && once) { + once = 0; init_thread_xstate(); + } mxcsr_feature_mask_init(); /* clean state in init */ -- 1.6.0.3