diff --git a/mm/cma.c b/mm/cma.c
index 2906ae5a..a6033e3 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -348,6 +348,32 @@
 	return ret;
 }
 
+#ifdef CONFIG_CMA_DEBUG
+static void cma_debug_show_areas(struct cma *cma)
+{
+	unsigned long next_zero_bit, next_set_bit;
+	unsigned long start = 0;
+	unsigned int nr_zero, nr_total = 0;
+
+	mutex_lock(&cma->lock);
+	pr_info("number of available pages: ");
+	for (;;) {
+		next_zero_bit = find_next_zero_bit(cma->bitmap, cma->count, start);
+		if (next_zero_bit >= cma->count)
+			break;
+		next_set_bit = find_next_bit(cma->bitmap, cma->count, next_zero_bit);
+		nr_zero = next_set_bit - next_zero_bit;
+		pr_cont("%s%u@%lu", nr_total ? "+" : "", nr_zero, next_zero_bit);
+		nr_total += nr_zero;
+		start = next_zero_bit + nr_zero;
+	}
+	pr_cont("=> %u free of %lu total pages\n", nr_total, cma->count);
+	mutex_unlock(&cma->lock);
+}
+#else
+static inline void cma_debug_show_areas(struct cma *cma) { }
+#endif
+
 /**
  * cma_alloc() - allocate pages from contiguous area
  * @cma:   Contiguous memory region for which the allocation is performed.
@@ -365,7 +391,7 @@
 	unsigned long start = 0;
 	unsigned long bitmap_maxno, bitmap_no, bitmap_count;
 	struct page *page = NULL;
-	int ret;
+	int ret = -ENOMEM;
 
 	if (!cma || !cma->count)
 		return NULL;
@@ -423,6 +449,12 @@
 
 	trace_cma_alloc(pfn, page, count, align);
 
+	if (ret) {
+		pr_info("%s: alloc failed, req-size: %zu pages, ret: %d\n",
+			__func__, count, ret);
+		cma_debug_show_areas(cma);
+	}
+
 	pr_debug("%s(): returned %p\n", __func__, page);
 	return page;
 }