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

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Date:   Tue, 11 Feb 2020 14:10:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.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 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)