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Date:   Tue, 7 Aug 2018 20:48:20 -0400
From:   Steven Rostedt <>
To:     Joel Fernandes <>
Cc:     Joel Fernandes <>,
        LKML <>,
        "Cc: Android Kernel" <>,
        Boqun Feng <>,
        Byungchul Park <>,
        Ingo Molnar <>,
        Masami Hiramatsu <>,
        Mathieu Desnoyers <>,
        Namhyung Kim <>,
        Paul McKenney <>,
        Peter Zijlstra <>,
        Thomas Glexiner <>,
        Tom Zanussi <>
Subject: Re: [PATCH v12 3/3] tracing: Centralize preemptirq tracepoints and
 unify their usage

On Tue, 07 Aug 2018 19:54:13 -0400
Joel Fernandes <> wrote:

> >OK, I hit this bug, but it's not because of the partial revert. This
> >bug seems it needs to be another partial revert. I like you movement of
> >the code, but I'm starting to doubt that we can use a trace event as a
> >hook for critical areas yet. Well, not until we can use srcu in NMI.
> >  
> I sent a patch to use srcu for all tracepoints including nmi. That
> patch also removes this warning and fixes the one other issue masami
> reported (hot plug causing a warning).

Is it one I can take, or does Paul have it? I'll need it to continue
with this as is, because I can't pass my tests without triggering that
warning (and that fails the test).

> If Paul and Mathieu can confirm SRCU works on offline CPUs that would
> be great.

Yes please.

> It's just this one warning or anything else that makes you feel
> tracepoints for critical paths isn't feasible?

Currently I'm down to this, but I can't get past my first test in my
ktest suite, because it fails here.

-- Steve

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