linux-kernel - Re: [PATCH] tracing/perf: Move rcu_irq_enter/exit

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Date:   Tue, 11 Feb 2020 05:20:30 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH] tracing/perf: Move rcu_irq_enter/exit_irqson() to perf
 trace point hook

On Tue, Feb 11, 2020 at 02:10:46PM +0100, Peter Zijlstra wrote:
> On Tue, Feb 11, 2020 at 04:59:29AM -0800, Paul E. McKenney wrote:
> 
> > However, a quick grep for NMI_MASK didn't show me the NMI_MASK bit
> > getting set.  Help?
> 
> | #define nmi_enter()						\
> | 	do {							\
> | 		arch_nmi_enter();				\
> | 		printk_nmi_enter();				\
> | 		lockdep_off();					\
> | 		ftrace_nmi_enter();				\
> | 		BUG_ON(in_nmi());				\
> | 		preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET);	\
> 
> 		^^^^ right there
> 
> | 		rcu_nmi_enter();				\
> | 		trace_hardirq_enter();				\
> | 	} while (0)

Color me blind, and thank you!

							Thanx, Paul