linux-kernel - Re: [PATCH v12 3/3] tracing: Centralize preemptirq tracepoints and unify their usage

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Date:   Mon, 6 Aug 2018 21:43:00 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Byungchul Park <byungchul.park@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Glexiner <tglx@...utronix.de>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: Re: [PATCH v12 3/3] tracing: Centralize preemptirq tracepoints and
 unify their usage

On Mon, 6 Aug 2018 17:43:19 -0700
Joel Fernandes <joelaf@...gle.com> wrote:

> On Mon, Aug 6, 2018 at 12:50 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> > With this patch applied, I'm constantly getting lockdep errors. Instead
> > of doing a full revert of the patch, I did this, which makes all those
> > errors go away. I may apply this for now, and we can revisit having
> > lockdep use the tracepoint code. But since it's currently always
> > enabled, I'm thinking of just leaving this as is. The macros are still
> > clean from Joel's patch.
> >
> > Thoughts?  
> 
> I like your patch. Thanks a lot for doing this.. It keeps most of the
> benefits of my patch while avoiding the issues with lockdep. I agree
> we can look at the remaining lockdep issue after. There were several
> lockdep issues with this patch that I fixed over the the months, but
> there's still the one that Masami reported that I believe you're also
> seeing. Once I'm back I'll work on figuring that one out.
> 
> Could you pull in the fixes to the other issues I posted though? With
> that we should be good.
> https://lore.kernel.org/patchwork/patch/971104/
> https://lore.kernel.org/patchwork/patch/971829/
>

I already had these applied when I created this patch ;-)

Thanks, I'll add it.

-- Steve