Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1753151AbdCXRgl (ORCPT <rfc822;w@1wt.eu>);
        Fri, 24 Mar 2017 13:36:41 -0400
Received: from foss.arm.com ([217.140.101.70]:45018 "EHLO foss.arm.com"
        rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP
        id S1753054AbdCXRge (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 24 Mar 2017 13:36:34 -0400
Date: Fri, 24 Mar 2017 17:35:15 +0000
From: Mark Rutland <mark.rutland@arm.com>
To: Doug Berger <opendmb@gmail.com>
Cc: catalin.marinas@arm.com, robh+dt@kernel.org, will.deacon@arm.com,
        computersforpeace@gmail.com, gregory.0xf0@gmail.com,
        f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com,
        wangkefeng.wang@huawei.com, james.morse@arm.com,
        vladimir.murzin@arm.com, panand@redhat.com, andre.przywara@arm.com,
        cmetcalf@mellanox.com, mingo@kernel.org, sandeepa.s.prabhu@gmail.com,
        shijie.huang@arm.com, linus.walleij@linaro.org, treding@nvidia.com,
        jonathanh@nvidia.com, olof@lixom.net, mirza.krak@gmail.com,
        suzuki.poulose@arm.com, bgolaszewski@baylibre.com,
        horms+renesas@verge.net.au, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/9] arm64: mm: install SError abort handler
Message-ID: <20170324173515.GB10746@leverpostej>
References: <20170324144632.5896-1-opendmb@gmail.com>
 <20170324144632.5896-4-opendmb@gmail.com>
 <20170324151654.GD29588@leverpostej>
 <58D54DE8.9020707@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <58D54DE8.9020707@gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 717
Lines: 16

On Fri, Mar 24, 2017 at 09:48:40AM -0700, Doug Berger wrote:
> On 03/24/2017 08:16 AM, Mark Rutland wrote:
> >On Fri, Mar 24, 2017 at 07:46:26AM -0700, Doug Berger wrote:

> If you would consider an alternative implementation where we scrap
> the SError handler (i.e. maintain the ugliness in our downstream
> kernel) in favor of a more gentle user mode crash on SError that
> allows the kernel the opportunity to service the interrupt for
> diagnostic purposes I could try to repackage that.

If this is just for diagnostic purposes, I believe you can register a
panic notifier, which can then read from the bus. The panic will occur,
but you'll have the opportunity to log some information to dmesg.

Thanks,
Mark.