patches/old/mm-add-split_folio.patch

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: add split_folio()
Date: Fri, 2 Sep 2022 20:46:00 +0100

This wrapper removes a need to use split_huge_page(&folio->page).  Convert
two callers.

Link: https://lkml.kernel.org/r/20220902194653.1739778-5-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/huge_mm.h |    5 +++++
 mm/shmem.c              |    2 +-
 mm/truncate.c           |    2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)

--- a/include/linux/huge_mm.h~mm-add-split_folio
+++ a/include/linux/huge_mm.h
@@ -444,6 +444,11 @@ static inline int split_folio_to_list(st
 	return split_huge_page_to_list(&folio->page, list);
 }
 
+static inline int split_folio(struct folio *folio)
+{
+	return split_folio_to_list(folio, NULL);
+}
+
 /*
  * archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to
  * limitations in the implementation like arm64 MTE can override this to
--- a/mm/shmem.c~mm-add-split_folio
+++ a/mm/shmem.c
@@ -629,7 +629,7 @@ next:
 			goto move_back;
 		}
 
-		ret = split_huge_page(&folio->page);
+		ret = split_folio(folio);
 		folio_unlock(folio);
 		folio_put(folio);
 
--- a/mm/truncate.c~mm-add-split_folio
+++ a/mm/truncate.c
@@ -240,7 +240,7 @@ bool truncate_inode_partial_folio(struct
 		folio_invalidate(folio, offset, length);
 	if (!folio_test_large(folio))
 		return true;
-	if (split_huge_page(&folio->page) == 0)
+	if (split_folio(folio) == 0)
 		return true;
 	if (folio_test_dirty(folio))
 		return false;
_