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| author |   Alexei Starovoitov <ast@kernel.org> | 2019-10-15 20:24:55 -0700 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-10-17 16:44:35 +0200 |
| commit | e8c423fb31fa8b1ef6d7cd14a168de33e7c0d702 (patch) | |
| tree | deed1e4a6eb1316a94197c9de41b9c24aff63210 /include/trace/bpf_probe.h | |
| parent | bpf/stackmap: Fix deadlock with rq_lock in bpf_get_stack() (diff) | |
| download | wireguard-linux-e8c423fb31fa8b1ef6d7cd14a168de33e7c0d702.tar.xz wireguard-linux-e8c423fb31fa8b1ef6d7cd14a168de33e7c0d702.zip | |
bpf: Add typecast to raw_tracepoints to help BTF generation
When pahole converts dwarf to btf it emits only used types.
Wrap existing __bpf_trace_##template() function into
btf_trace_##template typedef and use it in type cast to
make gcc emits this type into dwarf. Then pahole will convert it to btf.
The "btf_trace_" prefix will be used to identify BTF enabled raw tracepoints.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191016032505.2089704-2-ast@kernel.org
Diffstat (limited to 'include/trace/bpf_probe.h')
| -rw-r--r-- | include/trace/bpf_probe.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/trace/bpf_probe.h b/include/trace/bpf_probe.h index d6e556c0a085..b04c29270973 100644 --- a/include/trace/bpf_probe.h +++ b/include/trace/bpf_probe.h @@ -74,11 +74,12 @@ static inline void bpf_test_probe_##call(void) \ { \ check_trace_callback_type_##call(__bpf_trace_##template); \ } \ +typedef void (*btf_trace_##call)(void *__data, proto); \ static struct bpf_raw_event_map __used \ __attribute__((section("__bpf_raw_tp_map"))) \ __bpf_trace_tp_map_##call = { \ .tp = &__tracepoint_##call, \ - .bpf_func = (void *)__bpf_trace_##template, \ + .bpf_func = (void *)(btf_trace_##call)__bpf_trace_##template, \ .num_args = COUNT_ARGS(args), \ .writable_size = size, \ }; |