From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S947511AbcJaWTC (ORCPT ); Mon, 31 Oct 2016 18:19:02 -0400 Received: from mail.kernel.org ([198.145.29.136]:39130 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S947492AbcJaWS6 (ORCPT ); Mon, 31 Oct 2016 18:18:58 -0400 From: Andy Lutomirski To: x86@kernel.org Cc: Borislav Petkov , linux-kernel@vger.kernel.org, Rusty Russell , Paolo Bonzini , Rik van Riel , kvm list , Andy Lutomirski Subject: [PATCH 1/8] fpu/init: Get rid of two redundant clts() calls Date: Mon, 31 Oct 2016 15:18:42 -0700 Message-Id: <476d2d5066eda24838853426ea74c94140b50c85.1477951965.git.luto@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CR0.TS is cleared by a direct CR0 write in fpu__init_cpu_generic(). We don't need to call clts() two more times right after that. Signed-off-by: Andy Lutomirski --- arch/x86/kernel/fpu/init.c | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c index 1a09d133c801..60dece392b3a 100644 --- a/arch/x86/kernel/fpu/init.c +++ b/arch/x86/kernel/fpu/init.c @@ -10,15 +10,6 @@ #include /* - * Initialize the TS bit in CR0 according to the style of context-switches - * we are using: - */ -static void fpu__init_cpu_ctx_switch(void) -{ - clts(); -} - -/* * Initialize the registers found in all CPUs, CR0 and CR4: */ static void fpu__init_cpu_generic(void) @@ -55,7 +46,6 @@ void fpu__init_cpu(void) { fpu__init_cpu_generic(); fpu__init_cpu_xstate(); - fpu__init_cpu_ctx_switch(); } /* @@ -290,14 +280,6 @@ void __init fpu__init_system(struct cpuinfo_x86 *c) */ fpu__init_cpu(); - /* - * But don't leave CR0::TS set yet, as some of the FPU setup - * methods depend on being able to execute FPU instructions - * that will fault on a set TS, such as the FXSAVE in - * fpu__init_system_mxcsr(). - */ - clts(); - fpu__init_system_generic(); fpu__init_system_xstate_size_legacy(); fpu__init_system_xstate(); -- 2.7.4