From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11474C64EBC for ; Thu, 4 Oct 2018 14:06:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6C2B20684 for ; Thu, 4 Oct 2018 14:06:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D6C2B20684 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727684AbeJDU7d (ORCPT ); Thu, 4 Oct 2018 16:59:33 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:36270 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727380AbeJDU7c (ORCPT ); Thu, 4 Oct 2018 16:59:32 -0400 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1g84GO-0002ic-No; Thu, 04 Oct 2018 16:06:00 +0200 From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, Andy Lutomirski , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , kvm@vger.kernel.org, "Jason A. Donenfeld" , Rik van Riel , Dave Hansen , Sebastian Andrzej Siewior Subject: [PATCH 02/11] x86/fpu: add (__)make_fpregs_active helpers Date: Thu, 4 Oct 2018 16:05:38 +0200 Message-Id: <20181004140547.13014-3-bigeasy@linutronix.de> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20181004140547.13014-1-bigeasy@linutronix.de> References: <20181004140547.13014-1-bigeasy@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rik van Riel Add helper function that ensures the floating point registers for the current task are active. Use with preemption disabled. Signed-off-by: Rik van Riel Signed-off-by: Sebastian Andrzej Siewior --- arch/x86/include/asm/fpu/internal.h | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index a38bf5a1e37ad..16c4077ffc945 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -514,6 +514,26 @@ static inline void fpregs_activate(struct fpu *fpu) trace_x86_fpu_regs_activated(fpu); } +/* + * Load the FPU state for the current task. Call with preemption disabled. + */ +static inline void __fpregs_load_activate(struct fpu *fpu, int cpu) +{ + if (!fpregs_state_valid(fpu, cpu)) + copy_kernel_to_fpregs(&fpu->state); + fpregs_activate(fpu); +} + +static inline void __fpregs_changes_begin(void) +{ + preempt_disable(); +} + +static inline void __fpregs_changes_end(void) +{ + preempt_enable(); +} + /* * FPU state switching for scheduling. * @@ -553,11 +573,8 @@ static inline void switch_fpu_finish(struct fpu *new_fpu, int cpu) bool preload = static_cpu_has(X86_FEATURE_FPU) && new_fpu->initialized; - if (preload) { - if (!fpregs_state_valid(new_fpu, cpu)) - copy_kernel_to_fpregs(&new_fpu->state); - fpregs_activate(new_fpu); - } + if (preload) + __fpregs_load_activate(new_fpu, cpu); } /* -- 2.19.0