linux-kernel - Re: [PATCH] lib: update DEBUG

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Date:   Sat, 13 Jun 2020 13:39:24 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] lib: update DEBUG_SHIRQ docs to match reality


> > There is no extra interrupt when registering a shared interrupt handler
> > since 2011. Update the Kconfig text to make it clear and to avoid wrong
> > assumptions when debugging issues found by it.
> >
> 
> I'm not sure.
> I have recently fixed a bug in the IIO sensor during ->probe() due to
> an issued test interrupt exactly as soon as the handler is registered.

$ git grep DEBUG_SHIRQ_FIXME
kernel/irq/manage.c:#ifdef CONFIG_DEBUG_SHIRQ_FIXME

There is no place to enable this code.

Maybe your case was like Krzysztof's case where the issue turned out to
be the extra interrupt on deregistering after a deferred probe? He
thought it was the initial interrupt but it wasn't.


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