On 2026/1/23 15:57 bot+bpf-ci@kernel.org write:

quoted

diff --git a/tools/testing/selftests/bpf/progs/fsession_test.c b/tools/testing/selftests/bpf/progs/fsession_test.c
new file mode 100644
index 000000000000..f504984d42f2
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/fsession_test.c

@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 ChinaTelecom */
+#include <vmlinux.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";

[ ... ]

quoted

+__u64 test6_entry_result = 0;
+__u64 test6_exit_result = 0;
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test6, int a)
+{
+	__u64 addr = bpf_get_func_ip(ctx);
+
+	if (bpf_session_is_return(ctx))
+		test6_exit_result = (const void *) addr == &bpf_fentry_test1;
+	else
+		test6_entry_result = (const void *) addr == &bpf_fentry_test1;

                                                          ^^^^^^^^^^^^^^^^^^

Is the bpf_fentry_test1 symbol declared somewhere? The code references
&bpf_fentry_test1 but there is no extern declaration with __ksym in this
file.

The symbol "bpf_fentry_test1" will be declared in vmlinux.h, which is
generated automatically.

Other BPF selftests that take addresses of kernel symbols declare them
explicitly, for example get_func_ip_test.c has:

    extern int bpf_fentry_test1(int a) __ksym;

And kprobe_multi_session.c has:

    extern const void bpf_fentry_test1 __ksym;

Without a similar declaration, will this BPF program compile and load
correctly?

As I said above, it won't cause compile problem.

Thanks!
Menglong Dong

quoted

+	return 0;
+}

---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md

CI run summary: https://github.com/kernel-patches/bpf/actions/runs/21278745581