From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=iwfG=PW=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable autolearn_force=no
	version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id AF302C43387
	for <linuxppc-dev@archiver.kernel.org>; Mon, 14 Jan 2019 08:33:10 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id F261A20660
	for <linuxppc-dev@archiver.kernel.org>; Mon, 14 Jan 2019 08:33:09 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F261A20660
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=de.ibm.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 43dRYv5xmVzDqRL
	for <linuxppc-dev@archiver.kernel.org>; Mon, 14 Jan 2019 19:33:07 +1100 (AEDT)
Authentication-Results: lists.ozlabs.org;
 spf=pass (mailfrom) smtp.mailfrom=de.ibm.com
 (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com;
 envelope-from=heiko.carstens@de.ibm.com; receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=de.ibm.com
Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com
 [148.163.158.5])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 43dRX50Q8xzDqPg
 for <linuxppc-dev@lists.ozlabs.org>; Mon, 14 Jan 2019 19:31:32 +1100 (AEDT)
Received: from pps.filterd (m0098416.ppops.net [127.0.0.1])
 by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id
 x0E8PMmw067491
 for <linuxppc-dev@lists.ozlabs.org>; Mon, 14 Jan 2019 03:31:30 -0500
Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101])
 by mx0b-001b2d01.pphosted.com with ESMTP id 2q0n6smg3m-1
 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT)
 for <linuxppc-dev@lists.ozlabs.org>; Mon, 14 Jan 2019 03:31:30 -0500
Received: from localhost
 by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only!
 Violators will be prosecuted
 for <linuxppc-dev@lists.ozlabs.org> from <heiko.carstens@de.ibm.com>;
 Mon, 14 Jan 2019 08:31:27 -0000
Received: from b06cxnps3075.portsmouth.uk.ibm.com (9.149.109.195)
 by e06smtp05.uk.ibm.com (192.168.101.135) with IBM ESMTP SMTP Gateway:
 Authorized Use Only! Violators will be prosecuted; 
 (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256)
 Mon, 14 Jan 2019 08:31:17 -0000
Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com
 [9.149.105.59])
 by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id
 x0E8VFL935848340
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL);
 Mon, 14 Jan 2019 08:31:15 GMT
Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id A898CA4057;
 Mon, 14 Jan 2019 08:31:15 +0000 (GMT)
Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id A4C28A404D;
 Mon, 14 Jan 2019 08:31:14 +0000 (GMT)
Received: from osiris (unknown [9.152.212.95])
 by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTPS;
 Mon, 14 Jan 2019 08:31:14 +0000 (GMT)
Date: Mon, 14 Jan 2019 09:31:13 +0100
From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH 15/15] arch: add pkey and rseq syscall numbers everywhere
References: <20190110162435.309262-1-arnd@arndb.de>
 <20190110162435.309262-16-arnd@arndb.de>
 <20190110203638.GB3676@osiris>
 <CAK8P3a0M6qSJQAtFNKVS5muissKvyzeE9MSYT_uwKnM4BKCAug@mail.gmail.com>
MIME-Version: 1.0
In-Reply-To: <CAK8P3a0M6qSJQAtFNKVS5muissKvyzeE9MSYT_uwKnM4BKCAug@mail.gmail.com>
X-TM-AS-GCONF: 00
x-cbid: 19011408-0020-0000-0000-0000030625BC
X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused
x-cbparentid: 19011408-0021-0000-0000-0000215735B7
Message-Id: <20190114083113.GB15160@osiris>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 8bit
Content-Disposition: inline
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, ,
 definitions=2019-01-14_04:, , signatures=0
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0
 priorityscore=1501
 malwarescore=0 suspectscore=5 phishscore=0 bulkscore=0 spamscore=0
 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0
 mlxlogscore=792 adultscore=0 classifier=spam adjust=0 reason=mlx
 scancount=1 engine=8.0.1-1810050000 definitions=main-1901140072
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: Rich Felker <dalias@libc.org>, linux-ia64@vger.kernel.org,
 Linux-sh list <linux-sh@vger.kernel.org>,
 Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>,
 Dominik Brodowski <linux@dominikbrodowski.net>, linux-mips@vger.kernel.org,
 Max Filippov <jcmvbkbc@gmail.com>, Deepa Dinamani <deepa.kernel@gmail.com>,
 "H. Peter Anvin" <hpa@zytor.com>, sparclinux <sparclinux@vger.kernel.org>,
 linux-s390 <linux-s390@vger.kernel.org>, Davidlohr Bueso <dave@stgolabs.net>,
 y2038 Mailman List <y2038@lists.linaro.org>, Helge Deller <deller@gmx.de>,
 the arch/x86 maintainers <x86@kernel.org>,
 Russell King - ARM Linux <linux@armlinux.org.uk>,
 Ingo Molnar <mingo@redhat.com>, Geert Uytterhoeven <geert@linux-m68k.org>,
 Firoz Khan <firoz.khan@linaro.org>, Matt Turner <mattst88@gmail.com>,
 Fenghua Yu <fenghua.yu@intel.com>,
 linux-m68k <linux-m68k@lists.linux-m68k.org>,
 Ivan Kokshaysky <ink@jurassic.park.msu.ru>, Andy Lutomirski <luto@kernel.org>,
 Thomas Gleixner <tglx@linutronix.de>,
 Linux ARM <linux-arm-kernel@lists.infradead.org>,
 Michal Simek <monstr@monstr.eu>, Tony Luck <tony.luck@intel.com>,
 Parisc List <linux-parisc@vger.kernel.org>,
 Linux API <linux-api@vger.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 Paul Burton <paul.burton@mips.com>,
 "Eric W . Biederman" <ebiederm@xmission.com>,
 alpha <linux-alpha@vger.kernel.org>,
 Martin Schwidefsky <schwidefsky@de.ibm.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
 David Miller <davem@davemloft.net>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

On Fri, Jan 11, 2019 at 06:30:43PM +0100, Arnd Bergmann wrote:
> On Thu, Jan 10, 2019 at 9:36 PM Heiko Carstens
> <heiko.carstens@de.ibm.com> wrote:
> > On Thu, Jan 10, 2019 at 05:24:35PM +0100, Arnd Bergmann wrote:
> 
> > Since you only need/want the system call numbers, could you please
> > change these lines to:
> >
> > > +384  common  pkey_alloc              -                               -
> > > +385  common  pkey_free               -                               -
> > > +386  common  pkey_mprotect           -                               -
> >
> > Otherwise it _looks_ like we would need compat wrappers here as well,
> > even though all of them would just jump to sys_ni_syscall() in this
> > case. Making this explicit seems to better.
> 
> Ok, fair enough. I considered doing this originally and then
> decided against it for consistency with the asm-generic file,
> but I don't care much either way.
> 
> Is this something you may want to add later? I'm not sure exactly
> how pkey compares to s390 storage keys, or if this is something
> completely unrelated.

I don't think pkeys will ever work on s390, since they require a key
per mapping, while the s390 storage keys are per physical page.