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

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