[PATCH 1/8] mm: Separate out FOLIO_FLAGS from PAGEFLAGS

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

We've progressed far enough with the folio transition that some flags
are now no longer checked on pages, but only on folios.  To prevent
new users appearing, prepare to only define the folio versions of the
flag test/set/clear.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/page-flags.h | 63 ++++++++++++++++++++++++++------------
 1 file changed, 43 insertions(+), 20 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 735cddc13d20..95ab75d0b39c 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -367,54 +367,77 @@ static unsigned long *folio_flags(struct folio *folio, unsigned n)
 #define FOLIO_PF_NO_COMPOUND	0
 #define FOLIO_PF_SECOND		1
 
+#define FOLIO_HEAD_PAGE		0
+#define FOLIO_SECOND_PAGE	1
+
 /*
  * Macros to create function definitions for page flags
  */
+#define FOLIO_TEST_FLAG(name, page)					\
+static __always_inline bool folio_test_##name(struct folio *folio)	\
+{ return test_bit(PG_##name, folio_flags(folio, page)); }
+
+#define FOLIO_SET_FLAG(name, page)					\
+static __always_inline void folio_set_##name(struct folio *folio)	\
+{ set_bit(PG_##name, folio_flags(folio, page)); }
+
+#define FOLIO_CLEAR_FLAG(name, page)					\
+static __always_inline void folio_clear_##name(struct folio *folio)	\
+{ clear_bit(PG_##name, folio_flags(folio, page)); }
+
+#define __FOLIO_SET_FLAG(name, page)					\
+static __always_inline void __folio_set_##name(struct folio *folio)	\
+{ __set_bit(PG_##name, folio_flags(folio, page)); }
+
+#define __FOLIO_CLEAR_FLAG(name, page)					\
+static __always_inline void __folio_clear_##name(struct folio *folio)	\
+{ __clear_bit(PG_##name, folio_flags(folio, page)); }
+
+#define FOLIO_TEST_SET_FLAG(name, page)					\
+static __always_inline bool folio_test_set_##name(struct folio *folio)	\
+{ return test_and_set_bit(PG_##name, folio_flags(folio, page)); }
+
+#define FOLIO_TEST_CLEAR_FLAG(name, page)				\
+static __always_inline bool folio_test_clear_##name(struct folio *folio) \
+{ return test_and_clear_bit(PG_##name, folio_flags(folio, page)); }
+
+#define FOLIO_FLAG(name, page)						\
+FOLIO_TEST_FLAG(name, page)						\
+FOLIO_SET_FLAG(name, page)						\
+FOLIO_CLEAR_FLAG(name, page)
+
 #define TESTPAGEFLAG(uname, lname, policy)				\
-static __always_inline bool folio_test_##lname(struct folio *folio)	\
-{ return test_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); }	\
+FOLIO_TEST_FLAG(lname, FOLIO_##policy)					\
 static __always_inline int Page##uname(struct page *page)		\
 { return test_bit(PG_##lname, &policy(page, 0)->flags); }
 
 #define SETPAGEFLAG(uname, lname, policy)				\
-static __always_inline							\
-void folio_set_##lname(struct folio *folio)				\
-{ set_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); }		\
+FOLIO_SET_FLAG(lname, FOLIO_##policy)					\
 static __always_inline void SetPage##uname(struct page *page)		\
 { set_bit(PG_##lname, &policy(page, 1)->flags); }
 
 #define CLEARPAGEFLAG(uname, lname, policy)				\
-static __always_inline							\
-void folio_clear_##lname(struct folio *folio)				\
-{ clear_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); }		\
+FOLIO_CLEAR_FLAG(lname, FOLIO_##policy)					\
 static __always_inline void ClearPage##uname(struct page *page)		\
 { clear_bit(PG_##lname, &policy(page, 1)->flags); }
 
 #define __SETPAGEFLAG(uname, lname, policy)				\
-static __always_inline							\
-void __folio_set_##lname(struct folio *folio)				\
-{ __set_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); }		\
+__FOLIO_SET_FLAG(lname, FOLIO_##policy)					\
 static __always_inline void __SetPage##uname(struct page *page)		\
 { __set_bit(PG_##lname, &policy(page, 1)->flags); }
 
 #define __CLEARPAGEFLAG(uname, lname, policy)				\
-static __always_inline							\
-void __folio_clear_##lname(struct folio *folio)				\
-{ __clear_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); }	\
+__FOLIO_CLEAR_FLAG(lname, FOLIO_##policy)				\
 static __always_inline void __ClearPage##uname(struct page *page)	\
 { __clear_bit(PG_##lname, &policy(page, 1)->flags); }
 
 #define TESTSETFLAG(uname, lname, policy)				\
-static __always_inline							\
-bool folio_test_set_##lname(struct folio *folio)			\
-{ return test_and_set_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); } \
+FOLIO_TEST_SET_FLAG(lname, FOLIO_##policy)				\
 static __always_inline int TestSetPage##uname(struct page *page)	\
 { return test_and_set_bit(PG_##lname, &policy(page, 1)->flags); }
 
 #define TESTCLEARFLAG(uname, lname, policy)				\
-static __always_inline							\
-bool folio_test_clear_##lname(struct folio *folio)			\
-{ return test_and_clear_bit(PG_##lname, folio_flags(folio, FOLIO_##policy)); } \
+FOLIO_TEST_CLEAR_FLAG(lname, FOLIO_##policy)				\
 static __always_inline int TestClearPage##uname(struct page *page)	\
 { return test_and_clear_bit(PG_##lname, &policy(page, 1)->flags); }
 
-- 
2.43.0