Re: [PATCH v5 07/20] perf: Add api for pmus to write to AUX area

[Peter Zijlstra]

On Mon, Oct 13, 2014 at 04:45:35PM +0300, Alexander Shishkin wrote:
> +	/*
> +	 * Nesting is not supported for AUX area, make sure nested
> +	 * writers are caught early
> +	 */
> +	if (WARN_ON_ONCE(local_xchg(&rb->aux_nest, 1)))
> +		goto err_put;

Note that printk() from NMI is prone to making your machine die, not
that I have a better option though.
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