diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index f8e4b60db167..da50dab56b70 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -57,7 +57,7 @@ static int cma_maxchunk_get(void *data, u64 *val)
 	mutex_lock(&cma->lock);
 	for (;;) {
 		start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);
-		if (start >= cma->count)
+		if (start >= bitmap_maxno)
 			break;
 		end = find_next_bit(cma->bitmap, bitmap_maxno, start);
 		maxchunk = max(end - start, maxchunk);