[merged mm-stable] io_uring-zcrx-remove-nth_page-usage-within-folio.patch removed from -mm tree

[merged mm-stable] io_uring-zcrx-remove-nth_page-usage-within-folio.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: io_uring/zcrx: remove nth_page() usage within folio
has been removed from the -mm tree.  Its filename was
     io_uring-zcrx-remove-nth_page-usage-within-folio.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: David Hildenbrand <david@redhat.com>
Subject: io_uring/zcrx: remove nth_page() usage within folio
Date: Mon, 1 Sep 2025 17:03:41 +0200

Within a folio/compound page, nth_page() is no longer required.  Given
that we call folio_test_partial_kmap()+kmap_local_page(), the code would
already be problematic if the pages would span multiple folios.

So let's just assume that all src pages belong to a single folio/compound
page and can be iterated ordinarily.  The dst page is currently always a
single page, so we're not actually iterating anything.

Link: https://lkml.kernel.org/r/20250901150359.867252-21-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 io_uring/zcrx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/io_uring/zcrx.c~io_uring-zcrx-remove-nth_page-usage-within-folio
+++ a/io_uring/zcrx.c
@@ -975,9 +975,9 @@ static ssize_t io_copy_page(struct io_co
 
 		if (folio_test_partial_kmap(page_folio(dst_page)) ||
 		    folio_test_partial_kmap(page_folio(src_page))) {
-			dst_page = nth_page(dst_page, dst_offset / PAGE_SIZE);
+			dst_page += dst_offset / PAGE_SIZE;
 			dst_offset = offset_in_page(dst_offset);
-			src_page = nth_page(src_page, src_offset / PAGE_SIZE);
+			src_page += src_offset / PAGE_SIZE;
 			src_offset = offset_in_page(src_offset);
 			n = min(PAGE_SIZE - src_offset, PAGE_SIZE - dst_offset);
 			n = min(n, len);
_

Patches currently in -mm which might be from david@redhat.com are