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=-14.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 41F29C433E0 for ; Thu, 21 Jan 2021 05:16:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D44D322B2A for ; Thu, 21 Jan 2021 05:16:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726983AbhAUFQB (ORCPT ); Thu, 21 Jan 2021 00:16:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:46794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725765AbhAUFKe (ORCPT ); Thu, 21 Jan 2021 00:10:34 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 84DE3238D7; Thu, 21 Jan 2021 05:09:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611205792; bh=YbN9Rjpu9+5amNEx8O6+cJGQ454I7ra1ehKAt1GioBM=; h=From:To:Cc:Subject:Date:From; b=dtXCriKiOvwgoc+79Hpjy63w5et/LfmSXYXfJCBYaialIgbyoJ4JRSJckgxnVgXgd jlvAFkBwgJh/EojnlipCY7Is/VZnYtu+QuMDl2jk+JP33Hqy//Z2cPPS4vPnFXuKoZ pLv2YCVm8d2U3fEmry5eZCkETUJrdAwrtTmwnig3ShORRMw63Ufxj1TOZjTSrJjNPA iEv1KqTF+9kQ2lqsewbEnGrVHEqd8K2Twg2xiQiyI8fiAHVtbZygSO+9S7klbx8MSL CCTSqYaAZL8W2VPxRHEv00nj9vxHlKdbIo9Dal8UoD118ZEWmP/+qlw+BVRaoN52Ko 0F/WOC/w9IHnw== From: Andy Lutomirski To: x86@kernel.org Cc: LKML , Krzysztof Mazur , =?UTF-8?q?Krzysztof=20Ol=C4=99dzki?= , Arnd Bergmann , Andy Lutomirski Subject: [PATCH v3 0/4] x86/fpu: Reduce unnecessary FNINIT and MXCSR usage Date: Wed, 20 Jan 2021 21:09:47 -0800 Message-Id: X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series fixes two regressions: a boot failure on AMD K7 and a performance regression on everything. I did a double-take here -- the regressions were reported by different people, both named Krzysztof :) Changes from v2: - Tidy up the if statements (Sean) - Changelog and comment improvements (Boris) Changes from v1: - Fix MMX better -- MMX really does need FNINIT. - Improve the EFI code. - Rename the KFPU constants. - Changelog improvements. Andy Lutomirski (4): x86/fpu: Add kernel_fpu_begin_mask() to selectively initialize state x86/mmx: Use KFPU_387 for MMX string operations x86/fpu: Make the EFI FPU calling convention explicit x86/fpu/64: Don't FNINIT in kernel_fpu_begin() arch/x86/include/asm/efi.h | 24 ++++++++++++++++++++---- arch/x86/include/asm/fpu/api.h | 27 +++++++++++++++++++++++++-- arch/x86/kernel/fpu/core.c | 9 +++++---- arch/x86/lib/mmx_32.c | 20 +++++++++++++++----- arch/x86/platform/efi/efi_64.c | 4 ++-- 5 files changed, 67 insertions(+), 17 deletions(-) -- 2.29.2