Re: [PATCH] mm: Add WARN_ON for possibility of infinite loop if empty lists in free_pcppages_bulk'

[Mel Gorman]

On Fri, Aug 19, 2016 at 05:45:18PM +0530, Pankaj Gupta wrote:
> While debugging issue in realtime kernel i found a scenario
> which resulted in infinite loop resulting because of empty pcp->lists
> and valid 'to_free' value. This patch is to add 'WARN_ON' in function
> 'free_pcppages_bulk' if there is possibility of infinite loop because 
> of any bug in code.
> 

What was the bug that allowed this situation to occur? It would imply
the pcp count was somehow out of sync.

-- 
Mel Gorman
SUSE Labs