linux-kernel - Re: [PATCH 3.17-rc4 v7 0/6] arm: Implement arch_trigger_all_cpu

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Date:	Tue, 14 Oct 2014 16:37:51 -0600
From:	Daniel Drake <drake@...lessm.com>
To:	Daniel Thompson <daniel.thompson@...aro.org>
Cc:	Russell King <linux@....linux.org.uk>,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3.17-rc4 v7 0/6] arm: Implement arch_trigger_all_cpu_backtrace

Hi,

Thanks a lot for working on this!

On Wed, Sep 17, 2014 at 10:10 AM, Daniel Thompson
<daniel.thompson@...aro.org> wrote:
> Changes *before* v1:
>
> * This patchset is a hugely cut-down successor to "[PATCH v11 00/19]
>   arm: KGDB NMI/FIQ support". Thanks to Thomas Gleixner for suggesting
>   the new structure. For historic details see:
>         https://lkml.org/lkml/2014/9/2/227

What's the right way to extend your work in order to get a NMI-like
watchdog hard lockup detector similar to the one on x86?

I'm testing your patches on Exynos4412 and I guess in their current
state they don't go quite this deep, as the only callers of
trigger_all_cpu_backtrace() are sysrq, hung_task and spinlock debug
code - none of which seem as fail-safe as a trigger like a
pre-programmed watchdog NMI interrupt would be.

Do I need to find a way to get CONFIG_FIQ available on this platform
first? and/or CONFIG_HARDLOCKUP_DETECTOR?

Thanks
Daniel
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