Received: by 10.223.185.116 with SMTP id b49csp6690321wrg; Thu, 8 Mar 2018 11:32:08 -0800 (PST) X-Google-Smtp-Source: AG47ELsy8NUZWnp4eVmQT+jqZJBp7xdnmkBGrBeSRYBRr6ApcLnFPzvP5sZW8GRhICFpyDjLebmk X-Received: by 2002:a17:902:b712:: with SMTP id d18-v6mr19907368pls.417.1520537528866; Thu, 08 Mar 2018 11:32:08 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1520537528; cv=none; d=google.com; s=arc-20160816; b=S44XsigD3TZb5Owv0q4CbpXTjcrIKBp7MucY6hjPipWvaLHnmS8VQKbpihGl06W9i2 kbMkN1czt7XjogOW+EgTA05fmH0mth8R5R/6Bs8UL7YtBYguy4VwTiGB7hj7qfgz53dW Rm3Ncj9K73V7UwySzysPXHG7eUSD4CWeEuStI9WLtFPD1/CYm2dzV7Ow9/Efjhk7gqA7 ugl0T61tpuXlsXRaRRV6/9kWFBOWrWA5VpPq6K3VWiaf5BRGIrdu4KMPqNd/O96Uzqtr N7gScXJjHzwc+TPK8UFgFLqGVGY7XnOyfT/f0mYHJlvrMrk2YAsxhnwZ7kCl/Uo5QOZy tEaA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:cc:references:to:subject:arc-authentication-results; bh=GC+27RWnYMdt5g/cAVZkV43VQCfviWcpmKC+mP6I9Eo=; b=y8oNEhzhikX1snZ09VBL5W/irMK73wXwyWWYMe07v7WHt7peNacXZ9KJ2XDYLYSASv YqA8sLj4Ct0sLbizuRurYsnTUbSjt+4OBy8h1ZzAqtF23mCH3WsaZfp2kCc4abgLDAOq iUF4qIjVSJtARjQiKBEasnolvpcXnO70LmZyT7bPcDPCWKj3eeNOPY/b1H3uRBFwyGnA Sx9H6DfVmYNNfChQ5J2xUnG2pg1/kDsl9hgCfkzJXCD318asTkz2qc+HhDjXHD9bYrvJ 8zmC9soNse3Qo93piE3S9AMcc7VhIzrStluQmnRi8N4si3TN4ufj7+OiSCeolhsQ0e7g /r5g== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id y14si13352375pgs.760.2018.03.08.11.31.48; Thu, 08 Mar 2018 11:32:08 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935882AbeCHTaf (ORCPT + 99 others); Thu, 8 Mar 2018 14:30:35 -0500 Received: from mga01.intel.com ([192.55.52.88]:37109 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932076AbeCHTac (ORCPT ); Thu, 8 Mar 2018 14:30:32 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Mar 2018 11:30:31 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,442,1515484800"; d="scan'208";a="32386422" Received: from dlyocum-mobl.amr.corp.intel.com (HELO [10.254.102.123]) ([10.254.102.123]) by FMSMGA003.fm.intel.com with ESMTP; 08 Mar 2018 11:30:30 -0800 Subject: Re: mm, x86, powerpc: pkey semantics for key-0 ? To: Ram Pai References: <1519257138-23797-1-git-send-email-linuxram@us.ibm.com> <1519257138-23797-4-git-send-email-linuxram@us.ibm.com> <2a7737cf-a5ba-c814-fdc7-45b5cdd47376@intel.com> <20180308182517.GO1060@ram.oc3035372033.ibm.com> Cc: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, benh@kernel.crashing.org, paulus@samba.org, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com, ebiederm@xmission.com, corbet@lwn.net, arnd@arndb.de, fweimer@redhat.com, msuchanek@suse.com, Ulrich.Weigand@de.ibm.com From: Dave Hansen Message-ID: <1bfaa8c0-cd9c-b590-9930-e9584dfb928d@intel.com> Date: Thu, 8 Mar 2018 11:30:29 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180308182517.GO1060@ram.oc3035372033.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/08/2018 10:25 AM, Ram Pai wrote: > Is there a reason why the default key; key-0, is not allowed to be > explicitly associated with pages using pkey_mprotect()? No, it's a bug if it is not permitted. I have a vague recollection of knowing about this and having a patch.