mm/compaction: disallow high-order page for migration target

[deliverable/linux.git] / mm / compaction.c

diff --git a/mm/compaction.c b/mm/compaction.c
index b6ab771600680467609412552ccfacb177ed7973..9a03fdb1fd848bca383a315f35ff875029c65de8 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -217,21 +217,12 @@ static inline bool compact_trylock_irqsave(spinlock_t *lock,
 /* Returns true if the page is within a block suitable for migration to */
 static bool suitable_migration_target(struct page *page)
 {
-       int migratetype = get_pageblock_migratetype(page);
-
-       /* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
-       if (migratetype == MIGRATE_RESERVE)
-               return false;
-
-       if (is_migrate_isolate(migratetype))
-               return false;
-
-       /* If the page is a large free page, then allow migration */
+       /* If the page is a large free page, then disallow migration */
        if (PageBuddy(page) && page_order(page) >= pageblock_order)
-               return true;
+               return false;
 
        /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
-       if (migrate_async_suitable(migratetype))
+       if (migrate_async_suitable(get_pageblock_migratetype(page)))
                return true;
 
        /* Otherwise skip the block */