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@xxxxxxxxxx>
---
include/trace/bpf_probe.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/trace/bpf_probe.h b/include/trace/bpf_probe.h
index d6e556c0a085..ff1a879773df 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_##template)(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_##template)__bpf_trace_##template, \
.num_args = COUNT_ARGS(args), \
.writable_size = size, \
};
--
2.20.0
