mm: remove free_unref_page_list()

All callers now use free_unref_folios() so we can delete this function.

Link: https://lkml.kernel.org/r/20240227174254.710559-15-willy@infradead.orgSigned-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/internal.h

@@ -453,7 +453,6 @@ extern int user_min_free_kbytes;
 
 void free_unref_page(struct page *page, unsigned int order);
 void free_unref_folios(struct folio_batch *fbatch);
-void free_unref_page_list(struct list_head *list);
 
 extern void zone_pcp_reset(struct zone *zone);
 extern void zone_pcp_disable(struct zone *zone);

mm/page_alloc.c

@@ -2605,24 +2605,6 @@ void free_unref_folios(struct folio_batch *folios)
 	folio_batch_reinit(folios);
 }
 
-void free_unref_page_list(struct list_head *list)
-{
-	struct folio_batch fbatch;
-
-	folio_batch_init(&fbatch);
-	while (!list_empty(list)) {
-		struct folio *folio = list_first_entry(list, struct folio, lru);
-
-		list_del(&folio->lru);
-		if (folio_batch_add(&fbatch, folio) > 0)
-			continue;
-		free_unref_folios(&fbatch);
-	}
-
-	if (fbatch.nr)
-		free_unref_folios(&fbatch);
-}
-
 /*
  * split_page takes a non-compound higher-order page, and splits it into
  * n (1<<order) sub-pages: page[0..n]