mm, compaction: skip over holes in __reset_isolation_suitable

__reset_isolation_suitable walks the whole zone pfn range and it tries
to jump over holes by checking the zone for each page. It might still
stumble over offline pages, though. Skip those by checking PageReserved.

Signed-off-by: Michal Hocko <mhocko@suse.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index 613c59e928cb..fb548e4c7bd4 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -236,10 +236,9 @@ static void __reset_isolation_suitable(struct zone *zone)
 
 		cond_resched();
 
-		if (!pfn_valid(pfn))
+		page = pfn_to_online_page(pfn);
+		if (!page)
 			continue;
-
-		page = pfn_to_page(pfn);
 		if (zone != page_zone(page))
 			continue;