From nobody Mon Jun 22 16:35:49 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16BC3C433EF for ; Mon, 21 Mar 2022 03:02:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344273AbiCUDD6 (ORCPT ); Sun, 20 Mar 2022 23:03:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236347AbiCUDD5 (ORCPT ); Sun, 20 Mar 2022 23:03:57 -0400 Received: from zg8tmja5ljk3lje4mi4ymjia.icoremail.net (zg8tmja5ljk3lje4mi4ymjia.icoremail.net [209.97.182.222]) by lindbergh.monkeyblade.net (Postfix) with SMTP id BBA1A11984C for ; Sun, 20 Mar 2022 20:02:32 -0700 (PDT) Received: from prodtpl.icoremail.net (unknown [10.12.1.20]) by hzbj-icmmx-2 (Coremail) with SMTP id AQAAfwA3ABEV6TdivivAAg--.3914S2; Mon, 21 Mar 2022 10:55:17 +0800 (CST) Received: from centos7.localdomain (unknown [202.43.158.76]) by mail (Coremail) with SMTP id AQAAfwDnyqPt6DdiYiUAAA--.1485S3; Mon, 21 Mar 2022 10:54:38 +0800 (CST) From: Zhiyuan Dai To: catalin.marinas@arm.com, will@kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Zhiyuan Dai Subject: [PATCH] arm64: assembler: Fine-tune code to improve code readability Date: Mon, 21 Mar 2022 10:54:34 +0800 Message-Id: <1647831274-3555-1-git-send-email-daizhiyuan@phytium.com.cn> X-Mailer: git-send-email 1.8.3.1 X-CM-TRANSID: AQAAfwDnyqPt6DdiYiUAAA--.1485S3 X-CM-SenderInfo: hgdl6xpl1xt0o6sk53xlxphulrpou0/ Authentication-Results: hzbj-icmmx-2; spf=neutral smtp.mail=daizhiyuan @phytium.com.cn; X-Coremail-Antispam: 1Uk129KBjvdXoW7Gr17XFWkCF17KF1xZr45trb_yoWDAFbEkw 1Sqw48GrWfJrZIqry8tF1FyFy0kw4kZFZxu3Wjkrn7Jr9Fv3W5Gws7JF9Y9r47WF15Ca1x ua4kJFWfJw1jqjkaLaAFLSUrUUUUbb8apTn2vfkv8UJUUUU8wcxFpf9Il3svdxBIdaVrnU Uv73VFW2AGmfu7jjvjm3AaLaJ3UjIYCTnIWjDUYxBIdaVFxhVjvjDU0xZFpf9x0zRUUUUU UUUU= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This patch tweaks the code to improve readability. Defined values are: PMUVer =3D=3D 0b0000 : Performance Monitors Extension not implemented. Signed-off-by: Zhiyuan Dai --- arch/arm64/include/asm/assembler.h | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/as= sembler.h index 6ebdc0f..efd43a1 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -489,11 +489,10 @@ */ .macro reset_pmuserenr_el0, tmpreg mrs \tmpreg, id_aa64dfr0_el1 - sbfx \tmpreg, \tmpreg, #ID_AA64DFR0_PMUVER_SHIFT, #4 - cmp \tmpreg, #1 // Skip if no PMU present - b.lt 9000f - msr pmuserenr_el0, xzr // Disable PMU access from EL0 -9000: + ubfx \tmpreg, \tmpreg, #ID_AA64DFR0_PMUVER_SHIFT, #4 + cbz \tmpreg, .Lskip_pmu_\@ // Skip if no PMU present + msr_s SYS_PMUSERENR_EL0, xzr // Disable PMU access from EL0 +.Lskip_pmu_\@: .endm =20 /* --=20 1.8.3.1