diff --git a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy2.c b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy2.c
index 37604b0b97aff7..72fd0d577506a2 100644
--- a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy2.c
+++ b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy2.c
@@ -58,12 +58,12 @@ __retval(33)
 SEC("tc")
 int tailcall_bpf2bpf_hierarchy_2(struct __sk_buff *skb)
 {
-	volatile int ret = 0;
+	int ret = 0;
 
 	subprog_tail0(skb);
 	subprog_tail1(skb);
 
-	asm volatile (""::"r+"(ret));
+	__sink(ret);
 	return (count1 << 16) | count0;
 }
 
diff --git a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy3.c b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy3.c
index 0cdbb781fcbc5b..a7fb91cb05b736 100644
--- a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy3.c
+++ b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy3.c
@@ -51,11 +51,11 @@ __retval(33)
 SEC("tc")
 int tailcall_bpf2bpf_hierarchy_3(struct __sk_buff *skb)
 {
-	volatile int ret = 0;
+	int ret = 0;
 
 	bpf_tail_call_static(skb, &jmp_table0, 0);
 
-	asm volatile (""::"r+"(ret));
+	__sink(ret);
 	return ret;
 }