On Sat, 14 Nov 2020 00:13:58 +0100
Thomas Gleixner <t...@linutronix.de> wrote:

> nmi:
>   ...
>   trace_hardirqs_off_finish() {
>     if (!this_cpu_read(tracing_irq_cpu)) {
>            this_cpu_write(tracing_irq_cpu, 1);
>            ...
>   }
>   ...
>   perf()
> 
> #PF
>   save_cr2()
>   
>   irqentry_enter()
>      trace_hardirqs_off_finish()
>         if (!this_cpu_read(tracing_irq_cpu)) {
> 
> So yes, it is recursion protected unless I'm missing something.

That should work.

-- Steve

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