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

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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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[PATCH] mm: Add WARN_ON for possibility of infinite loop if empty lists in free_pcppages_bulk' Pankaj Gupta <pagupta@redhat.com> - 2016-08-19 14:20 +0200
  Re: [PATCH] mm: Add WARN_ON for possibility of infinite loop if  empty lists in free_pcppages_bulk' Mel Gorman <mgorman@techsingularity.net> - 2016-08-19 14:50 +0200
    Re: [PATCH] mm: Add WARN_ON for possibility of infinite loop if  empty lists in free_pcppages_bulk' Pankaj Gupta <pagupta@redhat.com> - 2016-08-19 15:10 +0200
      Re: [PATCH] mm: Add WARN_ON for possibility of infinite loop if  empty lists in free_pcppages_bulk' Mel Gorman <mgorman@techsingularity.net> - 2016-08-19 16:10 +0200
        Re: [PATCH] mm: Add WARN_ON for possibility of infinite loop if  empty lists in free_pcppages_bulk' Pankaj Gupta <pagupta@redhat.com> - 2016-08-23 10:50 +0200

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