linux-kernel - Re: [PATCH 0/2] Enable support IPI_CPU_CRASH

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Date:   Mon, 28 Sep 2020 09:59:24 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     ito-yuichi@...itsu.com
Cc:     sumit.garg@...aro.org, tglx@...utronix.de, jason@...edaemon.net,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Enable support IPI_CPU_CRASH_STOP to be pseudo-NMI

On 2020-09-28 03:43, ito-yuichi@...itsu.com wrote:
> Hi Marc, Sumit
> 
> I would appreciate if you have any advice on this patch.

I haven't had a chance to look into it, as I'm not even sure I'll
take the core series in the first place (there are outstanding
regressions I can't reproduce, let alone fix them).

> 
> Yuichi Ito
> 
>> -----Original Message-----
>> From: Yuichi Ito <ito-yuichi@...itsu.com>
>> Sent: Thursday, September 24, 2020 1:43 PM
>> To: maz@...nel.org; sumit.garg@...aro.org; tglx@...utronix.de;
>> jason@...edaemon.net; catalin.marinas@....com; will@...nel.org
>> Cc: linux-arm-kernel@...ts.infradead.org; 
>> linux-kernel@...r.kernel.org; Ito,
>> Yuichi/伊藤 有一 <ito-yuichi@...itsu.com>
>> Subject: [PATCH 0/2] Enable support IPI_CPU_CRASH_STOP to be
>> pseudo-NMI
>> 
>> Enable support IPI_CPU_CRASH_STOP to be pseudo-NMI
>> 
>> This patchset enables IPI_CPU_CRASH_STOP IPI to be pseudo-NMI.
>> This allows kdump to collect system information even when the CPU is 
>> in a
>> HARDLOCKUP state.
>> 
>> Only IPI_CPU_CRASH_STOP uses NMI and the other IPIs remain normal
>> IRQs.
>> 
>> The patch has been tested on ThunderX.

Which ThunderX? TX2 (at least the incarnation I used in the past) wasn't
able to correctly deal with priorities.

         M.
-- 
Jazz is not dead. It just smells funny...