mm: create FOLIO_FLAG_FALSE and FOLIO_TYPE_OPS macros

Following the separation of FOLIO_FLAGS from PAGEFLAGS, separate
FOLIO_FLAG_FALSE from PAGEFLAG_FALSE and FOLIO_TYPE_OPS from
PAGE_TYPE_OPS.

Link: https://lkml.kernel.org/r/20240321142448.1645400-3-willy@infradead.org
Fixes: 9c5ccf2d ("mm: remove HUGETLB_PAGE_DTOR")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/page-flags.h

@@ -458,30 +458,51 @@ static __always_inline int TestClearPage##uname(struct page *page)	\
 	TESTSETFLAG(uname, lname, policy)				\
 	TESTCLEARFLAG(uname, lname, policy)
 
+#define FOLIO_TEST_FLAG_FALSE(name)					\
+static inline bool folio_test_##name(const struct folio *folio)		\
+{ return false; }
+#define FOLIO_SET_FLAG_NOOP(name)					\
+static inline void folio_set_##name(struct folio *folio) { }
+#define FOLIO_CLEAR_FLAG_NOOP(name)					\
+static inline void folio_clear_##name(struct folio *folio) { }
+#define __FOLIO_SET_FLAG_NOOP(name)					\
+static inline void __folio_set_##name(struct folio *folio) { }
+#define __FOLIO_CLEAR_FLAG_NOOP(name)					\
+static inline void __folio_clear_##name(struct folio *folio) { }
+#define FOLIO_TEST_SET_FLAG_FALSE(name)					\
+static inline bool folio_test_set_##name(struct folio *folio)		\
+{ return false; }
+#define FOLIO_TEST_CLEAR_FLAG_FALSE(name)				\
+static inline bool folio_test_clear_##name(struct folio *folio)		\
+{ return false; }
+
+#define FOLIO_FLAG_FALSE(name)						\
+FOLIO_TEST_FLAG_FALSE(name)						\
+FOLIO_SET_FLAG_NOOP(name)						\
+FOLIO_CLEAR_FLAG_NOOP(name)
+
 #define TESTPAGEFLAG_FALSE(uname, lname)				\
-static inline bool folio_test_##lname(const struct folio *folio) { return false; } \
+FOLIO_TEST_FLAG_FALSE(lname)						\
 static inline int Page##uname(const struct page *page) { return 0; }
 
 #define SETPAGEFLAG_NOOP(uname, lname)					\
-static inline void folio_set_##lname(struct folio *folio) { }		\
+FOLIO_SET_FLAG_NOOP(lname)						\
 static inline void SetPage##uname(struct page *page) {  }
 
 #define CLEARPAGEFLAG_NOOP(uname, lname)				\
-static inline void folio_clear_##lname(struct folio *folio) { }		\
+FOLIO_CLEAR_FLAG_NOOP(lname)						\
 static inline void ClearPage##uname(struct page *page) {  }
 
 #define __CLEARPAGEFLAG_NOOP(uname, lname)				\
-static inline void __folio_clear_##lname(struct folio *folio) { }	\
+__FOLIO_CLEAR_FLAG_NOOP(lname)						\
 static inline void __ClearPage##uname(struct page *page) {  }
 
 #define TESTSETFLAG_FALSE(uname, lname)					\
-static inline bool folio_test_set_##lname(struct folio *folio)		\
-{ return 0; }								\
+FOLIO_TEST_SET_FLAG_FALSE(lname)					\
 static inline int TestSetPage##uname(struct page *page) { return 0; }
 
 #define TESTCLEARFLAG_FALSE(uname, lname)				\
-static inline bool folio_test_clear_##lname(struct folio *folio)	\
-{ return 0; }								\
+FOLIO_TEST_CLEAR_FLAG_FALSE(lname)					\
 static inline int TestClearPage##uname(struct page *page) { return 0; }
 
 #define PAGEFLAG_FALSE(uname, lname) TESTPAGEFLAG_FALSE(uname, lname)	\
@@ -977,35 +998,38 @@ static inline int page_has_type(const struct page *page)
 	return page_type_has_type(page->page_type);
 }
 
+#define FOLIO_TYPE_OPS(lname, fname)					\
+static __always_inline bool folio_test_##fname(const struct folio *folio)\
+{									\
+	return folio_test_type(folio, PG_##lname);			\
+}									\
+static __always_inline void __folio_set_##fname(struct folio *folio)	\
+{									\
+	VM_BUG_ON_FOLIO(!folio_test_type(folio, 0), folio);		\
+	folio->page.page_type &= ~PG_##lname;				\
+}									\
+static __always_inline void __folio_clear_##fname(struct folio *folio)	\
+{									\
+	VM_BUG_ON_FOLIO(!folio_test_##fname(folio), folio);		\
+	folio->page.page_type |= PG_##lname;				\
+}
+
 #define PAGE_TYPE_OPS(uname, lname, fname)				\
+FOLIO_TYPE_OPS(lname, fname)						\
 static __always_inline int Page##uname(const struct page *page)		\
 {									\
 	return PageType(page, PG_##lname);				\
 }									\
-static __always_inline int folio_test_##fname(const struct folio *folio)\
-{									\
-	return folio_test_type(folio, PG_##lname);			\
-}									\
 static __always_inline void __SetPage##uname(struct page *page)		\
 {									\
 	VM_BUG_ON_PAGE(!PageType(page, 0), page);			\
 	page->page_type &= ~PG_##lname;					\
 }									\
-static __always_inline void __folio_set_##fname(struct folio *folio)	\
-{									\
-	VM_BUG_ON_FOLIO(!folio_test_type(folio, 0), folio);		\
-	folio->page.page_type &= ~PG_##lname;				\
-}									\
 static __always_inline void __ClearPage##uname(struct page *page)	\
 {									\
 	VM_BUG_ON_PAGE(!Page##uname(page), page);			\
 	page->page_type |= PG_##lname;					\
-}									\
-static __always_inline void __folio_clear_##fname(struct folio *folio)	\
-{									\
-	VM_BUG_ON_FOLIO(!folio_test_##fname(folio), folio);		\
-	folio->page.page_type |= PG_##lname;				\
-}									\
+}
 
 /*
  * PageBuddy() indicates that the page is free and in the buddy system