linux-kernel - Re: [for-next][PATCH 1/6] tracing: Partial revert of "tracing: Centralize preemptirq tracepoints and unify their usage"

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Message-ID: <CAEXW_YS5MEpAtdy5sMfPZEDtTeANyMD4=qMsbzHPiKampgqOXg@mail.gmail.com>
Date:   Fri, 10 Aug 2018 05:20:19 -0700
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [for-next][PATCH 1/6] tracing: Partial revert of "tracing:
 Centralize preemptirq tracepoints and unify their usage"

On Thu, Aug 9, 2018 at 2:03 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
>
> Joel Fernandes created a nice patch that cleaned up the duplicate hooks used
> by lockdep and irqsoff latency tracer. It made both use tracepoints. But it
> caused lockdep to trigger several false positives. We have not figured out
> why yet, but removing lockdep from using the trace event hooks and just call
> its helper functions directly (like it use to), makes the problem go away.
>
> This is a partial revert of the clean up patch c3bc8fd637a9 ("tracing:
> Centralize preemptirq tracepoints and unify their usage") that adds direct
> calls for lockdep, but also keeps most of the clean up done to get rid of
> the horrible preprocessor if statements.
>
> Link: http://lkml.kernel.org/r/20180806155058.5ee875f4@gandalf.local.home
>
> Cc: Joel Fernandes <joelaf@...gle.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Fixes: c3bc8fd637a9 ("tracing: Centralize preemptirq tracepoints and unify their usage")

Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>

thanks,

- Joel

> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  include/linux/irqflags.h        |  8 ++++++--
>  include/linux/lockdep.h         |  2 --
>  init/main.c                     |  2 --
>  kernel/locking/lockdep.c        | 14 ++-----------
>  kernel/trace/trace_preemptirq.c | 36 ++++++++++++++++++---------------
>  5 files changed, 28 insertions(+), 34 deletions(-)
>
> diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h