diff --git a/tools/virtio/ringtest/Makefile b/tools/virtio/ringtest/Makefile
index 877a8a4721b679ea41c36464bc3bddcec44b9d53..c012edbdb13b65c5e8578242e996d1bc11dbcb33 100644
--- a/tools/virtio/ringtest/Makefile
+++ b/tools/virtio/ringtest/Makefile
@@ -3,8 +3,8 @@ all:
 all: ring virtio_ring_0_9 virtio_ring_poll virtio_ring_inorder ptr_ring noring
 
 CFLAGS += -Wall
-CFLAGS += -pthread -O2 -ggdb
-LDFLAGS += -pthread -O2 -ggdb
+CFLAGS += -pthread -O2 -ggdb -flto -fwhole-program
+LDFLAGS += -pthread -O2 -ggdb -flto -fwhole-program
 
 main.o: main.c main.h
 ring.o: ring.c main.h
diff --git a/tools/virtio/ringtest/main.c b/tools/virtio/ringtest/main.c
index 147abb452a6ccc098bf50338e0c353f4b8896f8a..bda7f0dad981d79f2d66b7b16dfbb5f9e428746b 100644
--- a/tools/virtio/ringtest/main.c
+++ b/tools/virtio/ringtest/main.c
@@ -96,7 +96,7 @@ void set_affinity(const char *arg)
 	assert(!ret);
 }
 
-static void run_guest(void)
+static void __attribute__((__flatten__)) run_guest(void)
 {
 	int completed_before;
 	int completed = 0;
@@ -149,7 +149,7 @@ static void run_guest(void)
 	}
 }
 
-static void run_host(void)
+static void __attribute__((__flatten__)) run_host(void)
 {
 	int completed_before;
 	int completed = 0;