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Date:   Sun, 1 Mar 2020 13:23:05 -0500
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Andy Lutomirski <luto@kernel.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
        Brian Gerst <brgerst@gmail.com>,
        Juergen Gross <JGross@suse.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>,
        "Paul E. McKenney" <paulmck@kernel.org>
Subject: Re: [patch 4/8] x86/entry: Move irq tracing on syscall entry to
 C-code
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On Sun, 1 Mar 2020 08:00:01 -0800
Andy Lutomirski <luto@kernel.org> wrote:

> But the DEFINE_EVENT doesn't have the "_rcuidle" part.  And that's
> where I got lost in the macro maze.  I looked at the gcc asm output,
> and there is, indeed:
> 
> # ./include/trace/events/preemptirq.h:40:
> DEFINE_EVENT(preemptirq_template, irq_enable,
> 
> with a bunch of asm magic that looks like it's probably a tracepoint.
> I still don't quite see where the "_rcuidle" went.

See the code in include/linux/tracepoint.h and search for "rcuidle"
there. All defined trace events get a "_rcuidle" version, but as it is
declared a static inline, then they only show up if they are used.

-- Steve