As noted by Vlastimil Babka, the migratetype might be wrong if a PCP was
not locked so check the migrate type early. Similarly the !pcp check is
generally unlikely so explicitly tagging it makes sense.
This is a fix for the mm-unstable patch
mm-page_alloc-leave-irqs-enabled-for-per-cpu-page-allocations.patch
Reported-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
---
mm/page_alloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 323fec05c4c6..445066617204 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3516,6 +3516,7 @@ void free_unref_page_list(struct list_head *list)
struct zone *zone = page_zone(page);
list_del(&page->lru);
+ migratetype = get_pcppage_migratetype(page);
/* Different zone, different pcp lock. */
if (zone != locked_zone) {
@@ -3530,7 +3531,7 @@ void free_unref_page_list(struct list_head *list)
*/
pcp_trylock_prepare(UP_flags);
pcp = pcp_spin_trylock(zone->per_cpu_pageset);
- if (!pcp) {
+ if (unlikely(!pcp)) {
pcp_trylock_finish(UP_flags);
free_one_page(zone, page, page_to_pfn(page),
0, migratetype, FPI_NONE);
@@ -3545,7 +3546,6 @@ void free_unref_page_list(struct list_head *list)
* 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;
--
2.35.3
