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 DD367CF9C69 for ; Mon, 23 Sep 2024 10:54:12 +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=Y+sOs23LxoBNVTfS3KszCVfFBU/ZZVHdw76qtjXQLyw=; b=4+kVN/naUFeRnW8TiBoq4uEdWz R+GGs7mkPa4yhXQ1DZO/mXNYRi7m2cIkmTCUdlZkUNJqbyv3N8id7EHX3wt6kYsPFI8P6n7JrLu0r sgjZnTWq110rUxKrourriMJDGaSZ08J/F0bqtE2xOKNQzhp9U1nV1fQGPfI77vgih+2mV6wIQAO4L 33T1DCeQijcrTk30uPM+7RaB0StF9vlOMeTB/v5kBhGrS9JCYnCcKY+NIEj3DCjrHoUxKAwo9e6g/ 2bXDEeY5zfltF0bVi3uHD3b6HnE0CFMJO86EHtr/nA7A3qjamPenT1zAUUjy4e8CDkdEsk29N/7aT aaS4zLxg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1ssghg-0000000H1Dk-1akQ; Mon, 23 Sep 2024 10:54:04 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1ssggX-0000000H17Z-2bE0 for linux-arm-kernel@lists.infradead.org; Mon, 23 Sep 2024 10:52:55 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727088771; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Y+sOs23LxoBNVTfS3KszCVfFBU/ZZVHdw76qtjXQLyw=; b=iTOtiEny2wmJUvoz76YeCBqyNl/ygbKRaKmBnn/zvGwcS3kc20Cr2QUxqJ+YOhap3Qomhg wvvAtiLsPwH4Rb0jqn2IaEsXsitnJEajkSuFs/bNgbfMUiAndUhGsnxcjJYIkDQS5FiYN+ CxvTjCET6YrdJQ8Vskon1IxiRo9CV6Q= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-629-_B_MAFsMPKuFULX2GCN3Xg-1; Mon, 23 Sep 2024 06:52:48 -0400 X-MC-Unique: _B_MAFsMPKuFULX2GCN3Xg-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 677B019CC856; Mon, 23 Sep 2024 10:52:46 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.226.16]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 74F6419560AD; Mon, 23 Sep 2024 10:52:42 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 23 Sep 2024 12:52:34 +0200 (CEST) Date: Mon, 23 Sep 2024 12:52:29 +0200 From: Oleg Nesterov To: Will Deacon Cc: "Liao, Chang" , Catalin Marinas , mhiramat@kernel.org, peterz@infradead.org, mark.rutland@arm.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] arm64: uprobes: Optimize cache flushes for xol slot Message-ID: <20240923105228.GB20793@redhat.com> References: <20240919121719.2148361-1-liaochang1@huawei.com> <20240919141824.GB12149@redhat.com> <41fdfc47-4161-d2e4-6528-4079b660424f@huawei.com> <20240923071856.GA31866@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240923071856.GA31866@willie-the-truck> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240923_035253_754922_FDDBEB26 X-CRM114-Status: UNSURE ( 9.59 ) 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 09/23, Will Deacon wrote: > > However, we should use __GFP_ZERO anyway > because I don't think it's a good idea to map an uninitialised page into > userspace. Agreed, and imo this even needs a separate "fix info leak" patch. Oleg.