[merged mm-stable] mm-truncate-clarify-return-value-of-truncate_inode_partial_folio.patch removed from -mm tree

[merged mm-stable] mm-truncate-clarify-return-value-of-truncate_inode_partial_folio.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/truncate: clarify return value of truncate_inode_partial_folio()
has been removed from the -mm tree.  Its filename was
     mm-truncate-clarify-return-value-of-truncate_inode_partial_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: Zhang Yi <yi.zhang@huawei.com>
Subject: mm/truncate: clarify return value of truncate_inode_partial_folio()
Date: Mon, 28 Sep 2026 20:08:33 +0800

With the earlier rework the callers no longer rely on the return value of
truncate_inode_partial_folio() to decide whether to adjust the truncation
range.  The pstart/pend out-parameters carry that information instead. 
The callers now only use the return value as a flag indicating whether the
loop should be reset to pick up newly split sub-folios on the shmem path.

Return true if at least one split succeeded, and false otherwise.  This
clarifies the existing confusing return value semantics.

Link: https://lore.kernel.org/20260928120833.3440834-5-yi.zhang@huaweicloud.com
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Joanne Koong <joannelkoong@gmail.com>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: <yizhang089@gmail.com>
Cc: Yang Erkun <yangerkun@huawei.com>
Cc: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <yukuai@fnnas.com>
---

 mm/truncate.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

--- a/mm/truncate.c~mm-truncate-clarify-return-value-of-truncate_inode_partial_folio
+++ a/mm/truncate.c
@@ -216,8 +216,7 @@ static int folio_split_or_unmap(struct f
  * aligned inwards to min_order, i.e. the range of folios wholly within
  * [lstart, lend] and so safe to discard.
  *
- * Returns false if splitting failed so the caller can avoid
- * discarding the entire folio which is stubbornly unsplit.
+ * Return %true if at least one split succeeded, %false otherwise.
  */
 bool truncate_inode_partial_folio(struct folio *folio, loff_t lstart,
 				  loff_t lend, pgoff_t *pstart, pgoff_t *pend)
@@ -247,7 +246,7 @@ bool truncate_inode_partial_folio(struct
 	folio_wait_writeback(folio);
 	if (length == size) {
 		truncate_inode_folio(folio->mapping, folio);
-		return true;
+		return false;
 	}
 
 	/*
@@ -264,7 +263,7 @@ bool truncate_inode_partial_folio(struct
 	min_order = mapping_min_folio_order(folio->mapping);
 	min_nrbytes = mapping_min_folio_nrbytes(folio->mapping);
 	if (folio_order(folio) == min_order)
-		return true;
+		return false;
 
 	split_at = folio_page(folio, PAGE_ALIGN_DOWN(offset) / PAGE_SIZE);
 	if (!folio_split_or_unmap(folio, split_at, min_order)) {
@@ -327,10 +326,9 @@ out:
 			*pend = end;
 		return true;
 	}
-	if (folio_test_dirty(folio))
-		return false;
-	truncate_inode_folio(folio->mapping, folio);
-	return true;
+	if (!folio_test_dirty(folio))
+		truncate_inode_folio(folio->mapping, folio);
+	return false;
 }
 
 /*
_

Patches currently in -mm which might be from yi.zhang@huawei.com are