[PATCH v2 2/2] mm: remove unused folio refcount helpers

[Shivank Garg <shivankg@amd.com>]

folio_ref_inc_return(), folio_ref_dec_and_test() and folio_ref_dec_return()
have had no callers since they were added in commit c24016ac3a62 ("mm: Add
folio reference count functions"). The last folio_ref_sub_return() user
was removed in commit 38607c62b34b ("fs/dax: properly refcount fs dax
pages").

Signed-off-by: Shivank Garg <shivankg@amd.com>
---
 include/linux/page_ref.h | 24 ------------------------
 1 file changed, 24 deletions(-)

diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index 9f5c75d06f76..6fc20a49fa84 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -157,15 +157,6 @@ static inline void folio_ref_sub(struct folio *folio, int nr)
 	page_ref_sub(&folio->page, nr);
 }
 
-static inline int folio_ref_sub_return(struct folio *folio, int nr)
-{
-	int ret = atomic_sub_return(nr, &folio->_refcount);
-
-	if (page_ref_tracepoint_active(page_ref_mod_and_return))
-		__page_ref_mod_and_return(&folio->page, -nr, ret);
-	return ret;
-}
-
 static inline void page_ref_inc(struct page *page)
 {
 	atomic_inc(&page->_refcount);
@@ -213,11 +204,6 @@ static inline int page_ref_inc_return(struct page *page)
 	return ret;
 }
 
-static inline int folio_ref_inc_return(struct folio *folio)
-{
-	return page_ref_inc_return(&folio->page);
-}
-
 static inline int page_ref_dec_and_test(struct page *page)
 {
 	int ret = atomic_dec_and_test(&page->_refcount);
@@ -227,11 +213,6 @@ static inline int page_ref_dec_and_test(struct page *page)
 	return ret;
 }
 
-static inline int folio_ref_dec_and_test(struct folio *folio)
-{
-	return page_ref_dec_and_test(&folio->page);
-}
-
 static inline int page_ref_dec_return(struct page *page)
 {
 	int ret = atomic_dec_return(&page->_refcount);
@@ -241,11 +222,6 @@ static inline int page_ref_dec_return(struct page *page)
 	return ret;
 }
 
-static inline int folio_ref_dec_return(struct folio *folio)
-{
-	return page_ref_dec_return(&folio->page);
-}
-
 static inline bool page_ref_add_unless_zero(struct page *page, int nr)
 {
 	bool ret = atomic_add_unless(&page->_refcount, nr, 0);

-- 
2.53.0