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bpf: make bpf_session_is_return() reference optional

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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: 8fe4dc4f64 ("bpf: change prototype of bpf_session_{cookie,is_return}")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20260515113242.2706303-1-arnd@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Arnd Bergmann 2026-05-15 13:32:32 +02:00 committed by Alexei Starovoitov
parent 5939801753
commit a828abbb89
1 changed files with 4 additions and 0 deletions
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4
kernel/bpf/verifier.c
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@ -11263,7 +11263,11 @@ 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)