linux-kernel - Re: [PATCH 3/9] arm64: mm: install SError abort handler

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Date:   Fri, 24 Mar 2017 17:35:15 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Doug Berger <opendmb@...il.com>
Cc:     catalin.marinas@....com, robh+dt@...nel.org, will.deacon@....com,
        computersforpeace@...il.com, gregory.0xf0@...il.com,
        f.fainelli@...il.com, bcm-kernel-feedback-list@...adcom.com,
        wangkefeng.wang@...wei.com, james.morse@....com,
        vladimir.murzin@....com, panand@...hat.com, andre.przywara@....com,
        cmetcalf@...lanox.com, mingo@...nel.org,
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        linus.walleij@...aro.org, treding@...dia.com, jonathanh@...dia.com,
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        bgolaszewski@...libre.com, horms+renesas@...ge.net.au,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/9] arm64: mm: install SError abort handler

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.