[PATCH] bpf: Use an UNUSED id for bpf_session_cookie without FPROBE

[Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>]

bpf_session_cookie() is only available with CONFIG_FPROBE=y leading to
an unresolved symbol otherwise.

Use BTF_ID_UNUSED instead of bpf_session_cookie for CONFIG_FPROBE=n.

Fixes: 5c919acef8514 ("bpf: Add support for kprobe session cookie")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
 kernel/bpf/verifier.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 77da1f438becc..436f72bfcb9b9 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -11124,7 +11124,11 @@ BTF_ID(func, bpf_iter_css_task_new)
 #else
 BTF_ID_UNUSED
 #endif
+#ifdef CONFIG_FPROBE
 BTF_ID(func, bpf_session_cookie)
+#else
+BTF_ID_UNUSED
+#endif
 
 static bool is_kfunc_ret_null(struct bpf_kfunc_call_arg_meta *meta)
 {
-- 
2.45.1