[PATCHv5 04/17] mm: Move set/clear_compound_head() next to compound_head()

[Kiryl Shutsemau]

Move set_compound_head() and clear_compound_head() to be adjacent to the
compound_head() function in page-flags.h.

These functions encode and decode the same compound_info field, so
keeping them together makes it easier to verify their logic is
consistent, especially when the encoding changes.

Signed-off-by: Kiryl Shutsemau <kas at kernel.org>
Reviewed-by: Muchun Song <muchun.song at linux.dev>
Reviewed-by: Zi Yan <ziy at nvidia.com>
---
 include/linux/page-flags.h | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index aa46d49e82f7..d14a17ffb55b 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -290,6 +290,18 @@ static __always_inline unsigned long _compound_head(const struct page *page)
 
 #define compound_head(page)	((typeof(page))_compound_head(page))
 
+static __always_inline void set_compound_head(struct page *page,
+					      const struct page *head,
+					      unsigned int order)
+{
+	WRITE_ONCE(page->compound_info, (unsigned long)head + 1);
+}
+
+static __always_inline void clear_compound_head(struct page *page)
+{
+	WRITE_ONCE(page->compound_info, 0);
+}
+
 /**
  * page_folio - Converts from page to folio.
  * @p: The page.
@@ -865,18 +877,6 @@ static inline bool folio_test_large(const struct folio *folio)
 	return folio_test_head(folio);
 }
 
-static __always_inline void set_compound_head(struct page *page,
-					      const struct page *head,
-					      unsigned int order)
-{
-	WRITE_ONCE(page->compound_info, (unsigned long)head + 1);
-}
-
-static __always_inline void clear_compound_head(struct page *page)
-{
-	WRITE_ONCE(page->compound_info, 0);
-}
-
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static inline void ClearPageCompound(struct page *page)
 {
-- 
2.51.2