Commit 2f58e5de authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

mm/swap: convert put_pages_list to use folios 

Pages linked through the LRU list cannot be tail pages as ->compound_head
is in a union with one of the words of the list_head, and they cannot
be ZONE_DEVICE pages as ->pgmap is in a union with the same word.
Saves 60 bytes of text by removing a call to page_is_fake_head().

Link: https://lkml.kernel.org/r/20220617175020.717127-15-willy@infradead.org


Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ab5e653e

mm/swap.c

+8 −8
Original line number Diff line number Diff line
@@ -138,19 +138,19 @@ EXPORT_SYMBOL(__put_page); 
 */

void put_pages_list(struct list_head *pages)

{

	struct page *page, *next;

	struct folio *folio, *next;



	list_for_each_entry_safe(page, next, pages, lru) {

		if (!put_page_testzero(page)) {

			list_del(&page->lru);

	list_for_each_entry_safe(folio, next, pages, lru) {

		if (!folio_put_testzero(folio)) {

			list_del(&folio->lru);

			continue;

		}

		if (PageHead(page)) {

			list_del(&page->lru);

			__put_compound_page(page);

		if (folio_test_large(folio)) {

			list_del(&folio->lru);

			__put_compound_page(&folio->page);

			continue;

		}

		/* Cannot be PageLRU because it's passed to us using the lru */

		/* LRU flag must be clear because it's passed using the lru */

	}



	free_unref_page_list(pages);