Re: in_irq_or_nmi() and RFC patch

[Peter Zijlstra]

On Wed, Mar 29, 2017 at 09:44:41PM +0200, Jesper Dangaard Brouer wrote:
> @@ -2481,7 +2481,11 @@ void free_hot_cold_page(struct page *page, bool cold)
>  	unsigned long pfn = page_to_pfn(page);
>  	int migratetype;
>  
> -	if (in_interrupt()) {
> +	/*
> +	 * Exclude (hard) IRQ and NMI context from using the pcplists.
> +	 * But allow softirq context, via disabling BH.
> +	 */
> +	if (in_irq() || irqs_disabled()) {

Why do you need irqs_disabled() ? Also, your comment is stale, it still
refers to NMI context.

>  		__free_pages_ok(page, 0);
>  		return;
>  	}