Don't have to keep the redundant page count check for THP anymore after
switching to use generic migration code.
Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
---
mm/migrate.c | 12 ------------
1 file changed, 12 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 1c0c873375ab..328f76848d6c 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2097,18 +2097,6 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
if (isolate_lru_page(page))
return 0;
- /*
- * migrate_misplaced_transhuge_page() skips page migration's usual
- * check on page_count(), so we must do it here, now that the page
- * has been isolated: a GUP pin, or any other pin, prevents migration.
- * The expected page count is 3: 1 for page's mapcount and 1 for the
- * caller's pin and 1 for the reference taken by isolate_lru_page().
- */
- if (PageTransHuge(page) && page_count(page) != 3) {
- putback_lru_page(page);
- return 0;
- }
-
page_lru = page_is_file_lru(page);
mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru,
thp_nr_pages(page));
--
2.26.2
