[merged mm-stable] mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch removed from -mm tree

[merged mm-stable] mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/huge_memory: allow split shmem large folio to any lower order
has been removed from the -mm tree.  Its filename was
     mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.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: Zi Yan <ziy@nvidia.com>
Subject: mm/huge_memory: allow split shmem large folio to any lower order
Date: Wed, 22 Jan 2025 11:19:27 -0500

Commit 4d684b5f92ba ("mm: shmem: add large folio support for tmpfs") has
added large folio support to shmem.  Remove the restriction in
split_huge_page*().

Link: https://lkml.kernel.org/r/20250122161928.1240637-2-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Yang Shi <yang@os.amperecomputing.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/huge_memory.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/mm/huge_memory.c~mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order
+++ a/mm/huge_memory.c
@@ -3299,7 +3299,7 @@ static void __split_huge_page(struct pag
 		/* Some pages can be beyond EOF: drop them from page cache */
 		if (tail->index >= end) {
 			if (shmem_mapping(folio->mapping))
-				nr_dropped++;
+				nr_dropped += new_nr;
 			else if (folio_test_clear_dirty(tail))
 				folio_account_cleaned(tail,
 					inode_to_wb(folio->mapping->host));
@@ -3465,12 +3465,6 @@ int split_huge_page_to_list_to_order(str
 			return -EINVAL;
 		}
 	} else if (new_order) {
-		/* Split shmem folio to non-zero order not supported */
-		if (shmem_mapping(folio->mapping)) {
-			VM_WARN_ONCE(1,
-				"Cannot split shmem folio to non-0 order");
-			return -EINVAL;
-		}
 		/*
 		 * No split if the file system does not support large folio.
 		 * Note that we might still have THPs in such mappings due to
_

Patches currently in -mm which might be from ziy@nvidia.com are

xarray-add-xas_try_split-to-split-a-multi-index-entry.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split-fix.patch
mm-huge_memory-add-two-new-not-yet-used-functions-for-folio_split-fix-2.patch
mm-huge_memory-move-folio-split-common-code-to-__folio_split.patch
mm-huge_memory-add-buddy-allocator-like-non-uniform-folio_split.patch
mm-huge_memory-remove-the-old-unused-__split_huge_page.patch
mm-huge_memory-add-folio_split-to-debugfs-testing-interface.patch
mm-truncate-use-folio_split-in-truncate-operation.patch
selftests-mm-add-tests-for-folio_split-buddy-allocator-like-split.patch
mm-filemap-use-xas_try_split-in-__filemap_add_folio.patch
mm-shmem-use-xas_try_split-in-shmem_split_large_entry.patch