In the following patches, new zone, ZONE_CMA, will be introduced and it would be overlapped with other zones. Currently, many places iterating pfn range doesn't consider possibility of zone overlap and this would cause a problem such as printing wrong statistics information. To prevent this situation, this patch add some code to consider zone overlapping before adding ZONE_CMA. pagetypeinfo_showblockcount_print() prints zone's statistics so should consider zone overlap. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> --- mm/vmstat.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index 1b12d39..7a4ac8e 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -984,6 +984,8 @@ static void pagetypeinfo_showblockcount_print(struct seq_file *m, continue; page = pfn_to_page(pfn); + if (page_zone(page) != zone) + continue; /* Watch for unexpected holes punched in the memmap */ if (!memmap_valid_within(pfn, page, zone)) -- 1.7.9.5 -- 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>