[PATCH RFC 09/19] mm: move migratetype definitions to freetype.h

[Brendan Jackman]

Since migratetype are a sub-element of freetype, move the pure
definitions into the new freetype.h.

This will enable referring to these raw types from pageblock-flags.h.

Signed-off-by: Brendan Jackman <jackmanb@xxxxxxxxxx>
---
 include/linux/freetype.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mmzone.h   | 73 -----------------------------------------
 2 files changed, 84 insertions(+), 73 deletions(-)

diff --git a/include/linux/freetype.h b/include/linux/freetype.h
index 9f857d10bb5db..11bd6d2b94349 100644
--- a/include/linux/freetype.h
+++ b/include/linux/freetype.h
@@ -3,6 +3,66 @@
 #define _LINUX_FREETYPE_H
 
 #include <linux/types.h>
+#include <linux/mmdebug.h>
+
+/*
+ * A migratetype is the part of a freetype that encodes the mobility
+ * requirements for the allocations the freelist is intended to serve.
+ *
+ * It's also currently overloaded to encode page isolation state.
+ */
+enum migratetype {
+	MIGRATE_UNMOVABLE,
+	MIGRATE_MOVABLE,
+	MIGRATE_RECLAIMABLE,
+	MIGRATE_PCPTYPES,	/* the number of types on the pcp lists */
+	MIGRATE_HIGHATOMIC = MIGRATE_PCPTYPES,
+#ifdef CONFIG_CMA
+	/*
+	 * MIGRATE_CMA migration type is designed to mimic the way
+	 * ZONE_MOVABLE works.  Only movable pages can be allocated
+	 * from MIGRATE_CMA pageblocks and page allocator never
+	 * implicitly change migration type of MIGRATE_CMA pageblock.
+	 *
+	 * The way to use it is to change migratetype of a range of
+	 * pageblocks to MIGRATE_CMA which can be done by
+	 * __free_pageblock_cma() function.
+	 */
+	MIGRATE_CMA,
+	__MIGRATE_TYPE_END = MIGRATE_CMA,
+#else
+	__MIGRATE_TYPE_END = MIGRATE_HIGHATOMIC,
+#endif
+#ifdef CONFIG_MEMORY_ISOLATION
+	MIGRATE_ISOLATE,	/* can't allocate from here */
+#endif
+	MIGRATE_TYPES
+};
+
+/* In mm/page_alloc.c; keep in sync also with show_migration_types() there */
+extern const char * const migratetype_names[MIGRATE_TYPES];
+
+#ifdef CONFIG_CMA
+#  define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
+#else
+#  define is_migrate_cma(migratetype) false
+#endif
+
+static inline bool is_migrate_movable(int mt)
+{
+	return is_migrate_cma(mt) || mt == MIGRATE_MOVABLE;
+}
+
+/*
+ * Check whether a migratetype can be merged with another migratetype.
+ *
+ * It is only mergeable when it can fall back to other migratetypes for
+ * allocation. See fallbacks[MIGRATE_TYPES][3] in page_alloc.c.
+ */
+static inline bool migratetype_is_mergeable(int mt)
+{
+	return mt < MIGRATE_PCPTYPES;
+}
 
 /*
  * A freetype is the index used to identify free lists. This consists of a
@@ -35,4 +95,28 @@ static inline bool freetypes_equal(freetype_t a, freetype_t b)
 	return a.migratetype == b.migratetype;
 }
 
+static inline freetype_t migrate_to_freetype(enum migratetype mt,
+					     unsigned int flags)
+{
+	freetype_t freetype;
+
+	/* No flags supported yet. */
+	VM_WARN_ON_ONCE(flags);
+
+	freetype.migratetype = mt;
+	return freetype;
+}
+
+static inline enum migratetype free_to_migratetype(freetype_t freetype)
+{
+	return freetype.migratetype;
+}
+
+/* Convenience helper, return the freetype modified to have the migratetype. */
+static inline freetype_t freetype_with_migrate(freetype_t freetype,
+					       enum migratetype migratetype)
+{
+	return migrate_to_freetype(migratetype, freetype_flags(freetype));
+}
+
 #endif /* _LINUX_FREETYPE_H */
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 66a4cfc2afcb0..301328cbb8449 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -62,39 +62,7 @@
  */
 #define PAGE_ALLOC_COSTLY_ORDER 3
 
-enum migratetype {
-	MIGRATE_UNMOVABLE,
-	MIGRATE_MOVABLE,
-	MIGRATE_RECLAIMABLE,
-	MIGRATE_PCPTYPES,	/* the number of types on the pcp lists */
-	MIGRATE_HIGHATOMIC = MIGRATE_PCPTYPES,
 #ifdef CONFIG_CMA
-	/*
-	 * MIGRATE_CMA migration type is designed to mimic the way
-	 * ZONE_MOVABLE works.  Only movable pages can be allocated
-	 * from MIGRATE_CMA pageblocks and page allocator never
-	 * implicitly change migration type of MIGRATE_CMA pageblock.
-	 *
-	 * The way to use it is to change migratetype of a range of
-	 * pageblocks to MIGRATE_CMA which can be done by
-	 * __free_pageblock_cma() function.
-	 */
-	MIGRATE_CMA,
-	__MIGRATE_TYPE_END = MIGRATE_CMA,
-#else
-	__MIGRATE_TYPE_END = MIGRATE_HIGHATOMIC,
-#endif
-#ifdef CONFIG_MEMORY_ISOLATION
-	MIGRATE_ISOLATE,	/* can't allocate from here */
-#endif
-	MIGRATE_TYPES
-};
-
-/* In mm/page_alloc.c; keep in sync also with show_migration_types() there */
-extern const char * const migratetype_names[MIGRATE_TYPES];
-
-#ifdef CONFIG_CMA
-#  define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
 #  define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA)
 /*
  * __dump_folio() in mm/debug.c passes a folio pointer to on-stack struct folio,
@@ -103,27 +71,10 @@ extern const char * const migratetype_names[MIGRATE_TYPES];
 #  define is_migrate_cma_folio(folio, pfn) \
 	(get_pfnblock_migratetype(&folio->page, pfn) == MIGRATE_CMA)
 #else
-#  define is_migrate_cma(migratetype) false
 #  define is_migrate_cma_page(_page) false
 #  define is_migrate_cma_folio(folio, pfn) false
 #endif
 
-static inline bool is_migrate_movable(int mt)
-{
-	return is_migrate_cma(mt) || mt == MIGRATE_MOVABLE;
-}
-
-/*
- * Check whether a migratetype can be merged with another migratetype.
- *
- * It is only mergeable when it can fall back to other migratetypes for
- * allocation. See fallbacks[MIGRATE_TYPES][3] in page_alloc.c.
- */
-static inline bool migratetype_is_mergeable(int mt)
-{
-	return mt < MIGRATE_PCPTYPES;
-}
-
 #define for_each_free_list(list, zone, order) \
 	for (order = 0; order < NR_PAGE_ORDERS; order++) \
 		for (unsigned int idx = 0; \
@@ -131,30 +82,6 @@ static inline bool migratetype_is_mergeable(int mt)
 		     idx < NR_FREETYPE_IDXS; \
 		     idx++)
 
-static inline freetype_t migrate_to_freetype(enum migratetype mt,
-					     unsigned int flags)
-{
-	freetype_t freetype;
-
-	/* No flags supported yet. */
-	VM_WARN_ON_ONCE(flags);
-
-	freetype.migratetype = mt;
-	return freetype;
-}
-
-static inline enum migratetype free_to_migratetype(freetype_t freetype)
-{
-	return freetype.migratetype;
-}
-
-/* Convenience helper, return the freetype modified to have the migratetype. */
-static inline freetype_t freetype_with_migrate(freetype_t freetype,
-					       enum migratetype migratetype)
-{
-	return migrate_to_freetype(migratetype, freetype_flags(freetype));
-}
-
 extern int page_group_by_mobility_disabled;
 
 freetype_t get_pfnblock_freetype(const struct page *page, unsigned long pfn);

-- 
2.51.2