linux-kernel - Re: [PATCH] ftrace: Add missing check for existing hwlat thread

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Message-ID: <20180801160320.3a4c63f7@gandalf.local.home>
Date:   Wed, 1 Aug 2018 16:03:20 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Erica Bugden <erica.bugden@...utronix.de>,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        anna-maria@...utronix.de, bigeasy@...utronix.de
Subject: Re: [PATCH] ftrace: Add missing check for existing hwlat thread

On Wed, 1 Aug 2018 21:59:38 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> > This looks like it is treating the symptom and not the disease.  
> 
> My bad. We looked at the other instances of tracers and they all have
> protection against this kind of call sequence ...

Probably because they were all fixing the symptom ;-)

I'm going to keep Erica's patch and add a WARN_ON() to it just in case.
But can you still check if the patch I gave fixes it too?

-- Steve