From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1752670AbdGLTel (ORCPT <rfc822;w@1wt.eu>);
        Wed, 12 Jul 2017 15:34:41 -0400
Received: from mail-oi0-f65.google.com ([209.85.218.65]:36625 "EHLO
        mail-oi0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751161AbdGLTei (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 12 Jul 2017 15:34:38 -0400
MIME-Version: 1.0
In-Reply-To: <20170712175505.GG15191@arm.com>
References: <20170712013130.14792-1-palmer@dabbelt.com> <CAK8P3a2FhHhTwNErhqwijsYsOOmhMBuyx7EeSyBu00=Q-N8Viw@mail.gmail.com>
 <20170712175505.GG15191@arm.com>
From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 12 Jul 2017 21:34:36 +0200
X-Google-Sender-Auth: pbdQrGZmMnO_nrkbLS_wuwoc8vs
Message-ID: <CAK8P3a0ZMm+OSdqVcjQ3XygY7Sy9uwn2FO_vv2UMA0cay+S+=g@mail.gmail.com>
Subject: Re: RISC-V Linux Port v6
To: Will Deacon <will.deacon@arm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>, Olof Johansson <olof@lixom.net>,
        Andrew Morton <akpm@linux-foundation.org>, albert@sifive.com,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Michal Marek <mmarek@suse.com>, Peter Zijlstra <peterz@infradead.org>,
        Boqun Feng <boqun.feng@gmail.com>, Ingo Molnar <mingo@redhat.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        gregkh <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>,
        David Miller <davem@davemloft.net>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        =?UTF-8?B?RnLDqWTDqXJpYyBXZWlzYmVja2Vy?= <fweisbec@gmail.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        "Luis R. Rodriguez" <mcgrof@kernel.org>,
        Doug Ledford <dledford@redhat.com>,
        Bart Van Assche <bart.vanassche@sandisk.com>, sstabellini@kernel.org,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Mark Salter <msalter@redhat.com>,
        Nicolas Dichtel <nicolas.dichtel@6wind.com>,
        James Hogan <james.hogan@imgtec.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        patches@groups.riscv.org
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, Jul 12, 2017 at 7:55 PM, Will Deacon <will.deacon@arm.com> wrote:
> On Wed, Jul 12, 2017 at 09:58:01AM +0200, Arnd Bergmann wrote:
>> On Wed, Jul 12, 2017 at 3:31 AM, Palmer Dabbelt <palmer@dabbelt.com> wrote:
>> Without having looked at the current state of the patch series, I would
>> guess that next week is a good time to ask for inclusion *in* linux-next,
>> while continuing the review.
>
> My only concern about getting this into -next is that is sets expectations
> that this is going to land in the next merge window, but we're unable to
> review much of the atomics, barriers and locking code because the
> architecture document is being rewritten and is not yet available:
>
> https://marc.info/?i=8709419e3d964b86b025bb35a6b55440%40HQMAIL105.nvidia.com

I don't see that as a show-stopper for the merge: yes, the kernel port
will need to conform to the architecture once we know what it is, but
overall, this seems like a detail that can easily be fixed after the merge
as no ABI is involved.

The worst case here is that the initial release is a bit unstable, slow
or both and this will get fixed later. I would expect this to be the
case even if the atomics are all correct ;-)

       Arnd