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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 7F537C5AC7A for ; Fri, 7 Aug 2026 16:55:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=bWIbOMIabvh2FRV3LwVofPmulwegsTKvsyc2dTa2OuU=; b=PCA5DNV5kT5wxRJrvzZukXCR3K 7oQ3mUcINIEPISqNBry+olEQRxMHZOh5sSpice/dEnyV+Wxz4VFQwX15aAPrgQuPH2F2qb/JqDI2g jRrgQlIhkjELo14TxYw0qD5lATEg3LXFTkzaXiLNEUOLtmRCqrDz1G2IaSz37o4CnoIAwNNsfejw5 9126JgwLz2uAQmOcgkS0k/47Vd0bFnB2vWteE6yT2TIVNyXyBZGoIDYd69tNSPGUJG58pSbH1SODR kfjCh0TysfeIgiSJV87nOYVjvQaN3mbS5nuTXh29RCbjbEL07UYAe1ViFhtANjHZ2k8ssPNnR5R8S za7ZpQsA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wsNr4-00000008U9r-11Rp; Fri, 07 Aug 2026 16:55:34 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wsNr2-00000008U9Y-01zL for linux-arm-kernel@lists.infradead.org; Fri, 07 Aug 2026 16:55:33 +0000 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 227AB1516; Fri, 7 Aug 2026 09:55:21 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 937A23F9A2; Fri, 7 Aug 2026 09:55:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1786121725; bh=ocxdMUJvDaa1h9TOR1Asprph0tJoS9L74P7zEU+jrf8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WCvUPegGsA6lD2HKnUy6cU1uE2kJ3giH6Qmh+KRLtT53CH+OMVUJx8c/uSF4nMFwR PwgaTc96uHHQyUqNeJaHd79zLJQcqq9GNwvY0x99GAU27bCeMQWNfNRaymXyaqUoyD alBv5bOrjdzld6pPlUxr3zSrinCgcPvqcO+VzMVQ= Date: Fri, 7 Aug 2026 17:55:17 +0100 From: Catalin Marinas To: Qinxin Xia Cc: will@kernel.org, anshuman.khandual@arm.com, BenNiu@meta.com, robin.murphy@arm.com, xiqi2@huawei.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxarm@huawei.com, wangzhou1@hisilicon.com, sunnanyong@huawei.com, prime.zeng@hisilicon.com Subject: Re: [PATCH] arm64: uaccess: Optimize copy_to/from_user with LSUI extension Message-ID: References: <20260805035251.2813306-1-xiaqinxin@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260805035251.2813306-1-xiaqinxin@huawei.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260807_095532_142480_F5E433ED X-CRM114-Status: UNSURE ( 7.86 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Aug 05, 2026 at 11:52:51AM +0800, Qinxin Xia wrote: > Add support for the ARMv9.6/LSUI (Load/Store Unprivileged Immediate) > extension to optimize copy_from_user operations. The implementation > uses the alternative mechanism to select between the standard unprivileged > load-pair sequence and the new ldtp/sttp instruction at runtime based on > hardware capability. That's all good but do you have any numbers to back the change up? -- Catalin