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

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Message-ID: <alpine.DEB.2.21.1808012206570.1835@nanos.tec.linutronix.de>
Date:   Wed, 1 Aug 2018 22:07:12 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
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, Steven Rostedt wrote:

> 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?

Sure