mm: Remove page_cache_add_speculative() and page_cache_get_speculative()

These wrappers have no more callers, so delete them.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>

include/linux/mm.h

@@ -1215,10 +1215,9 @@ static inline void put_page(struct page *page)
  * applications that don't have huge page reference counts, this won't be an
  * issue.
  *
- * Locking: the lockless algorithm described in page_cache_get_speculative()
- * and page_cache_gup_pin_speculative() provides safe operation for
- * get_user_pages and page_mkclean and other calls that race to set up page
- * table entries.
+ * Locking: the lockless algorithm described in folio_try_get_rcu()
+ * provides safe operation for get_user_pages(), page_mkclean() and
+ * other calls that race to set up page table entries.
  */
 #define GUP_PIN_COUNTING_BIAS (1U << 10)
 

include/linux/pagemap.h

@@ -283,16 +283,6 @@ static inline struct inode *folio_inode(struct folio *folio)
 	return folio->mapping->host;
 }
 
-static inline bool page_cache_add_speculative(struct page *page, int count)
-{
-	return folio_ref_try_add_rcu((struct folio *)page, count);
-}
-
-static inline bool page_cache_get_speculative(struct page *page)
-{
-	return page_cache_add_speculative(page, 1);
-}
-
 /**
  * folio_attach_private - Attach private data to a folio.
  * @folio: Folio to attach data to.