Tracepoints functions can not be searched

[Tropicao]

Knowing the name of a specific tracepoint in the kernel (eg: sched_switch), it is currently possible to find its definition, but the corresponding function call can not be found directly with the search field. In this example, the corresponding function is trace_sched_switch, but inputing trace_sched_switch in the research field yields no results in Elixir.

[tleb]

So we have two entry types (summarising):

• defs, or definitions. Those are given to us by universal-ctags.
• refs, or references. Those are ANY word in the source code that have a definition with the same name.

So we don't have any entry for trace_sched_switch because ctags gives us no entry for it anywhere in the kernel. And no references because there are no definitions.

---

We could be able to do something about the definition using ctags -D:

⟩ wget -O sched.h \
    'https://elixir.bootlin.com/linux/v6.13.3/source/include/trace/events/sched.h?raw'

⟩ ctags -x -D "TRACE_EVENT(NAME, ...)=void trace_##NAME(void) {}" sched.h | \
    grep sched_switch
__trace_sched_switch_state function    190 sched.h          static inline long __trace_sched_switch_state(bool preempt,
trace_sched_switch function    269 sched.h          );

The issue is that -D leads to functions reported at the end of the macro. The question was asked to the universal-ctags maintainer. See #379. And masatake released a draft PR two days ago handling the issue! universal-ctags/ctags#4198