1 files changed, 12 insertions, 0 deletions
diff --git a/mm/cma.c b/mm/cma.c
index 546dd86..9d07750 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -280,6 +280,18 @@ static LIST_HEAD(cma_regions);
 #define cma_foreach_region(reg) \
 	list_for_each_entry(reg, &cma_regions, list)
 
+bool cma_is_registered_region(phys_addr_t start, size_t size)
+{
+	struct cma_region *reg;
+
+	cma_foreach_region(reg) {
+		if ((start >= reg->start) &&
+			((start + size) <= (reg->start + reg->size)))
+			return true;
+	}
+	return false;
+}
+
 int __must_check cma_region_register(struct cma_region *reg)
 {
 	const char *name, *alloc_name;