# Re: \[PATCH bpf-next\] bpf, tracing: unbreak lttng

- From: Alexei Starovoitov \<hidden\>
- Date: 2018-03-26 22:37:05 
- List: netdev
- Page: https://ratatoskr.run/netdev/2018/03/11086372
- Thread: https://ratatoskr.run/netdev/2018/03/11086365/t.md

```text
On 3/26/18 3:30 PM, Mathieu Desnoyers wrote:
> ----- On Mar 26, 2018, at 6:08 PM, Alexei Starovoitov ast@kernel.org wrote:
> [...]
>>
>> #ifdef CONFIG_TRACEPOINTS
>> -void *
>> -for_each_kernel_tracepoint(void *(*fct)(struct tracepoint *tp, void *priv),
>> +void
>> +for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
>> 			   void *priv);
>> +struct tracepoint *kernel_tracepoint_find_by_name(const char *name);
>> #else
>> -static inline void *
>> -for_each_kernel_tracepoint(void *(*fct)(struct tracepoint *tp, void *priv),
>> +static inline void
>> +for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
>> 			   void *priv)
>> {
>> 	return NULL;
>> }
>
> This patch is not reverting to the old code properly. It introduces a
> static inline void function that returns NULL. Please compile-test
> with CONFIG_TRACEPOINTS=n before submitting a patch involving tracepoints.

right. good catch. v2 is coming.
```