1 files changed, 15 insertions, 5 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_global_func1.c b/tools/testing/selftests/bpf/progs/test_global_func1.c
index 880260f6d536..fc69ff18880d 100644
--- a/tools/testing/selftests/bpf/progs/test_global_func1.c
+++ b/tools/testing/selftests/bpf/progs/test_global_func1.c
@@ -3,14 +3,15 @@
 #include <stddef.h>
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
 
-#ifndef MAX_STACK
-#define MAX_STACK (512 - 3 * 32 + 8)
-#endif
+#define MAX_STACK 260
 
 static __attribute__ ((noinline))
 int f0(int var, struct __sk_buff *skb)
 {
+	asm volatile ("");
+
 	return skb->len;
 }
 
@@ -19,6 +20,8 @@ int f1(struct __sk_buff *skb)
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return f0(0, skb) + skb->len;
 }
 
@@ -27,6 +30,10 @@ int f3(int, struct __sk_buff *skb, int);
 __attribute__ ((noinline))
 int f2(int val, struct __sk_buff *skb)
 {
+	volatile char buf[MAX_STACK] = {};
+
+	__sink(buf[MAX_STACK - 1]);
+
 	return f1(skb) + f3(val, skb, 1);
 }
 
@@ -35,11 +42,14 @@ int f3(int val, struct __sk_buff *skb, int var)
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return skb->ifindex * val * var;
 }
 
-SEC("classifier/test")
-int test_cls(struct __sk_buff *skb)
+SEC("tc")
+__failure __msg("combined stack size of 3 calls is")
+int global_func1(struct __sk_buff *skb)
 {
 	return f0(1, skb) + f1(skb) + f2(2, skb) + f3(3, skb, 4);
 }