+ iov_iter-convert-iter_xarray_populate_pages-to-use-folios.patch added to mm-new branch

+ iov_iter-convert-iter_xarray_populate_pages-to-use-folios.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: iov_iter: convert iter_xarray_populate_pages() to use folios
has been added to the -mm mm-new branch.  Its filename is
     iov_iter-convert-iter_xarray_populate_pages-to-use-folios.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/iov_iter-convert-iter_xarray_populate_pages-to-use-folios.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: iov_iter: convert iter_xarray_populate_pages() to use folios
Date: Wed, 2 Apr 2025 22:06:05 +0100

ITER_XARRAY is exclusively used with xarrays that contain folios, not
pages, so extract folio pointers from it, not page pointers.  Removes a
hidden call to compound_head() and a use of find_subpage().

Link: https://lkml.kernel.org/r/20250402210612.2444135-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/iov_iter.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/lib/iov_iter.c~iov_iter-convert-iter_xarray_populate_pages-to-use-folios
+++ a/lib/iov_iter.c
@@ -1059,22 +1059,22 @@ static ssize_t iter_xarray_populate_page
 					  pgoff_t index, unsigned int nr_pages)
 {
 	XA_STATE(xas, xa, index);
-	struct page *page;
+	struct folio *folio;
 	unsigned int ret = 0;
 
 	rcu_read_lock();
-	for (page = xas_load(&xas); page; page = xas_next(&xas)) {
-		if (xas_retry(&xas, page))
+	for (folio = xas_load(&xas); folio; folio = xas_next(&xas)) {
+		if (xas_retry(&xas, folio))
 			continue;
 
-		/* Has the page moved or been split? */
-		if (unlikely(page != xas_reload(&xas))) {
+		/* Has the folio moved or been split? */
+		if (unlikely(folio != xas_reload(&xas))) {
 			xas_reset(&xas);
 			continue;
 		}
 
-		pages[ret] = find_subpage(page, xas.xa_index);
-		get_page(pages[ret]);
+		pages[ret] = folio_file_page(folio, xas.xa_index);
+		folio_get(folio);
 		if (++ret == nr_pages)
 			break;
 	}
_

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

filemap-remove-readahead_page.patch
mm-remove-offset_in_thp.patch
iov_iter-convert-iter_xarray_populate_pages-to-use-folios.patch
iov_iter-convert-iov_iter_extract_xarray_pages-to-use-folios.patch
filemap-remove-find_subpage.patch
filemap-convert-__readahead_batch-to-use-a-folio.patch
filemap-remove-readahead_page_batch.patch
mm-delete-thp_nr_pages.patch