Vlastimil Babka pointed out that the original code was protected by the zone lock and provided a fix. This is a fix to the mmotm patch mm-page_alloc-check-once-if-a-zone-has-isolated-pageblocks.patch . Once applied the following line should be removed from the changelog "Technically this is race-prone but so is the existing code." Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9ad4e68486e9..c63e5e7e4864 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1098,9 +1098,10 @@ static void free_pcppages_bulk(struct zone *zone, int count, int migratetype = 0; int batch_free = 0; unsigned long nr_scanned; - bool isolated_pageblocks = has_isolate_pageblock(zone); + bool isolated_pageblocks; spin_lock(&zone->lock); + isolated_pageblocks = has_isolate_pageblock(zone); nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED); if (nr_scanned) __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned); -- 2.6.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>