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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8EDE5C2BD09 for ; Tue, 9 Jul 2024 13:38:36 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WJMWv2Pghz3frh for ; Tue, 9 Jul 2024 23:38:35 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=arm.com (client-ip=217.140.110.172; helo=foss.arm.com; envelope-from=kevin.brodsky@arm.com; receiver=lists.ozlabs.org) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lists.ozlabs.org (Postfix) with ESMTP id 4WJLvz6D3fz3cLk for ; Tue, 9 Jul 2024 23:10:54 +1000 (AEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2462F1650; Tue, 9 Jul 2024 06:10:48 -0700 (PDT) Received: from [10.44.160.75] (e126510-lin.lund.arm.com [10.44.160.75]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9B7283F766; Tue, 9 Jul 2024 06:10:15 -0700 (PDT) Message-ID: <48f65838-4da0-401b-8636-c595989cfe05@arm.com> Date: Tue, 9 Jul 2024 15:10:12 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 28/29] kselftest/arm64: Add test case for POR_EL0 signal frame records To: Joey Gouly , linux-arm-kernel@lists.infradead.org References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-29-joey.gouly@arm.com> Content-Language: en-GB From: Kevin Brodsky In-Reply-To: <20240503130147.1154804-29-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Tue, 09 Jul 2024 23:36:08 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: szabolcs.nagy@arm.com, catalin.marinas@arm.com, dave.hansen@linux.intel.com, linux-mm@kvack.org, hpa@zytor.com, shuah@kernel.org, maz@kernel.org, x86@kernel.org, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, mingo@redhat.com, naveen.n.rao@linux.ibm.com, will@kernel.org, npiggin@gmail.com, broonie@kernel.org, bp@alien8.de, kvmarm@lists.linux.dev, tglx@linutronix.de, oliver.upton@linux.dev, aneesh.kumar@linux.ibm.com, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 03/05/2024 15:01, Joey Gouly wrote: > +static uint64_t get_por_el0(void) > +{ > + uint64_t val; > + > + asm volatile ( > + "mrs %0, " SYS_POR_EL0 "\n" > + : "=r"(val) > + : > + : "cc"); Not sure why we would need "cc" for an MRS? __read_pkey_reg() doesn't use it (maybe we could directly use that function here if including pkey-arm64.h is OK). Kevin > + > + return val; > +}