v4.19.13 snapshot.
diff --git a/mm/cma.h b/mm/cma.h
new file mode 100644
index 0000000..33c0b51
--- /dev/null
+++ b/mm/cma.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __MM_CMA_H__
+#define __MM_CMA_H__
+
+struct cma {
+ unsigned long base_pfn;
+ unsigned long count;
+ unsigned long *bitmap;
+ unsigned int order_per_bit; /* Order of pages represented by one bit */
+ struct mutex lock;
+#ifdef CONFIG_CMA_DEBUGFS
+ struct hlist_head mem_head;
+ spinlock_t mem_head_lock;
+#endif
+ const char *name;
+};
+
+extern struct cma cma_areas[MAX_CMA_AREAS];
+extern unsigned cma_area_count;
+
+static inline unsigned long cma_bitmap_maxno(struct cma *cma)
+{
+ return cma->count >> cma->order_per_bit;
+}
+
+#endif