The patch titled
Subject: mm/page_isolation: do not isolate the max order page
has been removed from the -mm tree. Its filename was
mm-page_isolation-do-not-isolate-the-max-order-page.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: mm/page_isolation: do not isolate the max order page
A max order page has no buddy page and never merges to another order. So
isolating and then freeing it is pointless.
Link: https://lkml.kernel.org/r/20201202122114.75316-1-songmuchun@xxxxxxxxxxxxx
Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on isolated pageblock")
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_isolation.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_isolation.c~mm-page_isolation-do-not-isolate-the-max-order-page
+++ a/mm/page_isolation.c
@@ -88,7 +88,7 @@ static void unset_migratetype_isolate(st
*/
if (PageBuddy(page)) {
order = buddy_order(page);
- if (order >= pageblock_order) {
+ if (order >= pageblock_order && order < MAX_ORDER - 1) {
pfn = page_to_pfn(page);
buddy_pfn = __find_buddy_pfn(pfn, order);
buddy = page + (buddy_pfn - pfn);
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
