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SubjectRe: [PATCH v2 1/2] tracing: Move tracepoint callbacks into DEFINE

* Josh Stone <> wrote:

> It's not strictly correct for the tracepoint reg/unreg callbacks
> to occur when a client is hooking up, because the actual
> tracepoint may no be present yet. This happens to be fine for
> syscall, since that's in the core kernel, but it would cause
> problems for tracepoints defined in a module that hasn't been
> loaded yet. It also means the reg/unreg has to be EXPORTed for
> any modules to use the tracepoint (as in SystemTap).
> This patch removes DECLARE_TRACE_WITH_CALLBACK, and instead
> introduces DEFINE_TRACE_WITH_CALLBACK which stores the callbacks
> in struct tracepoint. The callbacks are used now when the active
> state of the tracepoint changes in set_tracepoint &
> disable_tracepoint.
> This also introduces TRACE_EVENT_WITH_CALLBACK, so those events
> can also provide callbacks if needed.

i think something shorter would be nicer, such as:



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