folio_movable_ops() does the same as page_movable_ops() except uses
folios instead of pages. This function will help make folio conversions
in mm/migrate.c more readable.
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
---
include/linux/migrate.h | 9 +++++++++
mm/migrate.c | 2 +-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3ef77f52a4f0..bdff950a8bb4 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -122,6 +122,15 @@ static inline bool folio_test_movable(struct folio *folio)
return PageMovable(&folio->page);
}
+static inline
+const struct movable_operations *folio_movable_ops(struct folio *folio)
+{
+ VM_BUG_ON(!__folio_test_movable(folio));
+
+ return (const struct movable_operations *)
+ ((unsigned long)folio->mapping - PAGE_MAPPING_MOVABLE);
+}
+
static inline
const struct movable_operations *page_movable_ops(struct page *page)
{
diff --git a/mm/migrate.c b/mm/migrate.c
index a4d3fc65085f..4c1776445c74 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -973,7 +973,7 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
goto out;
}
- mops = page_movable_ops(&src->page);
+ mops = folio_movable_ops(src);
rc = mops->migrate_page(&dst->page, &src->page, mode);
WARN_ON_ONCE(rc == MIGRATEPAGE_SUCCESS &&
!folio_test_isolated(src));
--
2.38.1
