The amount of available memory might be negative, when the OVERFLOW flag is used

src/datawizard/memalloc.c

@@ -1153,7 +1153,7 @@ void starpu_memchunk_tidy(unsigned node)
 		{
 			char name[32];
 			_starpu_memory_node_get_name(node, name, sizeof(name));
-			_STARPU_DISP("Low memory left on node %s (%luMiB over %luMiB). Your application data set seems too huge to fit on the device, StarPU will cope by trying to purge %lu MiB out. This message will not be printed again for further purges. The thresholds can be tuned using the STARPU_MINIMUM_AVAILABLE_MEM and STARPU_TARGET_AVAILABLE_MEM environment variables.\n", name, (unsigned long) (available / 1048576), (unsigned long) (total / 1048576), (unsigned long) (amount / 1048576));
+			_STARPU_DISP("Low memory left on node %s (%ldMiB over %luMiB). Your application data set seems too huge to fit on the device, StarPU will cope by trying to purge %lu MiB out. This message will not be printed again for further purges. The thresholds can be tuned using the STARPU_MINIMUM_AVAILABLE_MEM and STARPU_TARGET_AVAILABLE_MEM environment variables.\n", name, (long) (available / 1048576), (unsigned long) (total / 1048576), (unsigned long) (amount / 1048576));
 		}
 	}