When placing pages on a pcp list, migratetype values over
MIGRATE_PCPTYPES get added to the MIGRATE_MOVABLE pcp list.
However, the actual migratetype is preserved in the page and
should not be changed to MIGRATE_MOVABLE or the page may end
up on the wrong free_list.
Fixes: df1acc856923 ("mm/page_alloc: avoid conflating IRQs disabled with zone->lock")
Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
---
mm/page_alloc.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 73704e836649..8addb4919f75 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3436,19 +3436,10 @@ void free_unref_page_list(struct list_head *list)
* comment in free_unref_page.
*/
migratetype = get_pcppage_migratetype(page);
- if (unlikely(migratetype >= MIGRATE_PCPTYPES)) {
- if (unlikely(is_migrate_isolate(migratetype))) {
- list_del(&page->lru);
- free_one_page(page_zone(page), page, pfn, 0,
- migratetype, FPI_NONE);
- continue;
- }
-
- /*
- * Non-isolated types over MIGRATE_PCPTYPES get added
- * to the MIGRATE_MOVABLE pcp list.
- */
- set_pcppage_migratetype(page, MIGRATE_MOVABLE);
+ if (unlikely(is_migrate_isolate(migratetype))) {
+ list_del(&page->lru);
+ free_one_page(page_zone(page), page, pfn, 0, migratetype, FPI_NONE);
+ continue;
}
set_page_private(page, pfn);
@@ -3458,7 +3449,15 @@ void free_unref_page_list(struct list_head *list)
list_for_each_entry_safe(page, next, list, lru) {
pfn = page_private(page);
set_page_private(page, 0);
+
+ /*
+ * Non-isolated types over MIGRATE_PCPTYPES get added
+ * to the MIGRATE_MOVABLE pcp list.
+ */
migratetype = get_pcppage_migratetype(page);
+ if (unlikely(migratetype >= MIGRATE_PCPTYPES))
+ migratetype = MIGRATE_MOVABLE;
+
trace_mm_page_free_batched(page);
free_unref_page_commit(page, pfn, migratetype, 0);
--
2.25.1
