Re: [PATCH v2] mm/page_alloc: fix watchdog soft lockups during set_zone_contiguous()

[Andrew Morton]

On Thu, 16 Apr 2020 09:34:17 +0200 David Hildenbrand <david@xxxxxxxxxx> wrote:

> Without CONFIG_PREEMPT, it can happen that we get soft lockups detected,
> e.g., while booting up.
> 
> ...
> 
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1607,6 +1607,7 @@ void set_zone_contiguous(struct zone *zone)
>  		if (!__pageblock_pfn_to_page(block_start_pfn,
>  					     block_end_pfn, zone))
>  			return;
> +		cond_resched();
>  	}
>  
>  	/* We confirm that there is no hole */

I added cc:stable to this one.  Please let me know if that wasn't a
good idea.