[merged mm-stable] mm-remove-use-of-folio-list-from-folios_put.patch removed from -mm tree

[merged mm-stable] mm-remove-use-of-folio-list-from-folios_put.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: remove use of folio list from folios_put()
has been removed from the -mm tree.  Its filename was
     mm-remove-use-of-folio-list-from-folios_put.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: remove use of folio list from folios_put()
Date: Tue, 27 Feb 2024 17:42:40 +0000

Instead of putting the interesting folios on a list, delete the
uninteresting one from the folio_batch.

Link: https://lkml.kernel.org/r/20240227174254.710559-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swap.c |   19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

--- a/mm/swap.c~mm-remove-use-of-folio-list-from-folios_put
+++ a/mm/swap.c
@@ -961,12 +961,11 @@ void lru_cache_disable(void)
  */
 void folios_put_refs(struct folio_batch *folios, unsigned int *refs)
 {
-	int i;
-	LIST_HEAD(pages_to_free);
+	int i, j;
 	struct lruvec *lruvec = NULL;
 	unsigned long flags = 0;
 
-	for (i = 0; i < folios->nr; i++) {
+	for (i = 0, j = 0; i < folios->nr; i++) {
 		struct folio *folio = folios->folios[i];
 		unsigned int nr_refs = refs ? refs[i] : 1;
 
@@ -1016,14 +1015,20 @@ void folios_put_refs(struct folio_batch
 			count_vm_event(UNEVICTABLE_PGCLEARED);
 		}
 
-		list_add(&folio->lru, &pages_to_free);
+		if (j != i)
+			folios->folios[j] = folio;
+		j++;
 	}
 	if (lruvec)
 		unlock_page_lruvec_irqrestore(lruvec, flags);
+	if (!j) {
+		folio_batch_reinit(folios);
+		return;
+	}
 
-	mem_cgroup_uncharge_list(&pages_to_free);
-	free_unref_page_list(&pages_to_free);
-	folio_batch_reinit(folios);
+	folios->nr = j;
+	mem_cgroup_uncharge_folios(folios);
+	free_unref_folios(folios);
 }
 EXPORT_SYMBOL(folios_put_refs);
 
_

Patches currently in -mm which might be from willy@infradead.org are

mm-separate-out-folio_flags-from-pageflags.patch
mm-remove-pagewaiters-pagesetwaiters-and-pageclearwaiters.patch
mm-remove-pageyoung-and-pageidle-definitions.patch
mm-add-__dump_folio.patch
mm-add-__dump_folio-fix.patch
mm-add-__dump_folio-fix-2.patch
mm-add-__dump_folio-fix-3.patch
mm-make-dump_page-take-a-const-argument.patch
mm-constify-testing-page-folio-flags.patch
mm-constify-more-page-folio-tests.patch
mm-remove-cast-from-page_to_nid.patch
mm-mempolicy-use-a-folio-in-do_mbind.patch