* [PATCH] [v2] bpf: make bpf_session_is_return() reference optional
@ 2026-05-15 11:32 Arnd Bergmann
2026-05-15 17:00 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2026-05-15 11:32 UTC (permalink / raw)
To: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko,
Eduard Zingerman, Kumar Kartikeya Dwivedi, Menglong Dong
Cc: Arnd Bergmann, John Fastabend, Martin KaFai Lau, Song Liu,
Yonghong Song, Jiri Olsa, Puranjay Mohan, Anton Protopopov,
Mykyta Yatsenko, bpf, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
Building without CONFIG_BPF_EVENTS produces a build-time
warning:
WARN: resolve_btfids: unresolved symbol bpf_session_is_return
The function is actually defined in kernel/trace/bpf_trace.o,
which is built conditionally based on configuration.
Make the reference to this function conditional as well,
as is already done in the bpf verifier for other functions.
Fixes: 8fe4dc4f6456 ("bpf: change prototype of bpf_session_{cookie,is_return}")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: fix patch title
---
kernel/bpf/verifier.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 03f9e16c2abe..a5139f45e366 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -10882,7 +10882,11 @@ BTF_ID(func, bpf_task_work_schedule_resume)
BTF_ID(func, bpf_arena_alloc_pages)
BTF_ID(func, bpf_arena_free_pages)
BTF_ID(func, bpf_arena_reserve_pages)
+#ifdef CONFIG_BPF_EVENTS
BTF_ID(func, bpf_session_is_return)
+#else
+BTF_ID_UNUSED
+#endif
BTF_ID(func, bpf_stream_vprintk)
BTF_ID(func, bpf_stream_print_stack)
--
2.39.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] [v2] bpf: make bpf_session_is_return() reference optional
2026-05-15 11:32 [PATCH] [v2] bpf: make bpf_session_is_return() reference optional Arnd Bergmann
@ 2026-05-15 17:00 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2026-05-15 17:00 UTC (permalink / raw)
To: Arnd Bergmann
Cc: ast, daniel, andrii, eddyz87, memxor, menglong8.dong, arnd,
john.fastabend, martin.lau, song, yonghong.song, jolsa, puranjay,
a.s.protopopov, yatsenko, bpf, linux-kernel
Hello:
This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@kernel.org>:
On Fri, 15 May 2026 13:32:32 +0200 you wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Building without CONFIG_BPF_EVENTS produces a build-time
> warning:
>
> WARN: resolve_btfids: unresolved symbol bpf_session_is_return
>
> [...]
Here is the summary with links:
- [v2] bpf: make bpf_session_is_return() reference optional
https://git.kernel.org/bpf/bpf/c/a828abbb8976
You are awesome, thank you!
--
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2026-05-15 11:32 [PATCH] [v2] bpf: make bpf_session_is_return() reference optional Arnd Bergmann
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