On 1.4.2016 4:06, js1304@xxxxxxxxx wrote: > From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> > > There is a system that node's pfn are overlapped like as following. > > -----pfn--------> > N0 N1 N2 N0 N1 N2 > > Therefore, we need to care this overlapping when iterating pfn range. > > mark_free_pages() iterates requested zone's pfn range and unset > all range's bitmap first. And then it marks freepages in a zone > to the bitmap. If there is an overlapping zone, above unset could > clear previous marked bit and reference to this bitmap in the future > will cause the problem. To prevent it, this patch adds a zone check > in mark_free_pages(). > > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > --- > mm/page_alloc.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 0cfee62..437a934 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -2156,6 +2156,10 @@ void mark_free_pages(struct zone *zone) > for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) > if (pfn_valid(pfn)) { > page = pfn_to_page(pfn); > + > + if (page_zone(page) != zone) > + continue; > + > if (!swsusp_page_is_forbidden(page)) > swsusp_unset_page_free(page); > } > -- 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>