diff options
| -rw-r--r-- | mm/page_alloc.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 850009a7101e..2b8ba3aebf6e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3377,9 +3377,15 @@ static void setup_zone_migrate_reserve(struct zone *zone) unsigned long block_migratetype; int reserve; - /* Get the start pfn, end pfn and the number of blocks to reserve */ + /* + * Get the start pfn, end pfn and the number of blocks to reserve + * We have to be careful to be aligned to pageblock_nr_pages to + * make sure that we always check pfn_valid for the first page in + * the block. + */ start_pfn = zone->zone_start_pfn; end_pfn = start_pfn + zone->spanned_pages; + start_pfn = roundup(start_pfn, pageblock_nr_pages); reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >> pageblock_order; |