patches/old/mm-compaction-use-folio-in-hugetlb-pathway.patch

From: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
Subject: mm/compaction: use folio in hugetlb pathway
Date: Mon, 31 Mar 2025 19:10:25 -0700

Use a folio in the hugetlb pathway during the compaction migrate-able
pageblock scan.

This removes a call to compound_head().

Link: https://lkml.kernel.org/r/20250401021025.637333-2-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/hugetlb.h |    4 ++--
 mm/compaction.c         |    8 ++++----
 mm/hugetlb.c            |    3 +--
 3 files changed, 7 insertions(+), 8 deletions(-)

--- a/include/linux/hugetlb.h~mm-compaction-use-folio-in-hugetlb-pathway
+++ a/include/linux/hugetlb.h
@@ -695,7 +695,7 @@ struct huge_bootmem_page {
 
 bool hugetlb_bootmem_page_zones_valid(int nid, struct huge_bootmem_page *m);
 
-int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
+int isolate_or_dissolve_huge_folio(struct folio *folio, struct list_head *list);
 int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn);
 void wait_for_freed_hugetlb_folios(void);
 struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
@@ -1083,7 +1083,7 @@ static inline struct folio *filemap_lock
 	return NULL;
 }
 
-static inline int isolate_or_dissolve_huge_page(struct page *page,
+static inline int isolate_or_dissolve_huge_folio(struct folio *folio,
 						struct list_head *list)
 {
 	return -ENOMEM;
--- a/mm/compaction.c~mm-compaction-use-folio-in-hugetlb-pathway
+++ a/mm/compaction.c
@@ -1001,10 +1001,11 @@ isolate_migratepages_block(struct compac
 				locked = NULL;
 			}
 
-			ret = isolate_or_dissolve_huge_page(page, &cc->migratepages);
+			folio = page_folio(page);
+			ret = isolate_or_dissolve_huge_folio(folio, &cc->migratepages);
 
 			/*
-			 * Fail isolation in case isolate_or_dissolve_huge_page()
+			 * Fail isolation in case isolate_or_dissolve_huge_folio()
 			 * reports an error. In case of -ENOMEM, abort right away.
 			 */
 			if (ret < 0) {
@@ -1016,12 +1017,11 @@ isolate_migratepages_block(struct compac
 				goto isolate_fail;
 			}
 
-			if (PageHuge(page)) {
+			if (folio_test_hugetlb(folio)) {
 				/*
 				 * Hugepage was successfully isolated and placed
 				 * on the cc->migratepages list.
 				 */
-				folio = page_folio(page);
 				low_pfn += folio_nr_pages(folio) - 1;
 				goto isolate_success_no_list;
 			}
--- a/mm/hugetlb.c~mm-compaction-use-folio-in-hugetlb-pathway
+++ a/mm/hugetlb.c
@@ -2896,10 +2896,9 @@ free_new:
 	return ret;
 }
 
-int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
+int isolate_or_dissolve_huge_folio(struct folio *folio, struct list_head *list)
 {
 	struct hstate *h;
-	struct folio *folio = page_folio(page);
 	int ret = -EBUSY;
 
 	/*
_