linux-kernel - Re: [PATCH] tracing: Add trace_trigger kernel command line option

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Date:   Thu, 20 Oct 2022 14:53:40 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: Re: [PATCH] tracing: Add trace_trigger kernel command line option

On Thu, 20 Oct 2022 10:55:12 -0700
"Paul E. McKenney" <paulmck@...nel.org> wrote:

> > synchronize_rcu() {
> >     rcu_poll_gp_seq_start_unlocked() {
> > 	struct rcu_node *rnp = rcu_get_root();
> > 
> > 	if (rcu_init_invoked()) {
> > 		lockdep_assert_irqs_enabled();
> > 		raw_spin_lock_irq_rcu_node(rnp);
> > 	}
> > 	rcu_poll_gp_seq_start(snap);
> > 	if (rcu_init_invoked())
> > 		raw_spin_unlock_irq_rcu_node(rnp);  <<-- Interrupts enabled here
> >    }  
> 
> Thank you for digging into this!
> 
> Does the following help?

It does indeed!

I can remove the early_boot_irqs_disabled checks if you can add this to
this rc cycle and mark it stable.

-- Steve