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SubjectRe: [PATCH] tracing/profile: Fix profile_disable vs module_unload

On Thu, 27 Aug 2009, Peter Zijlstra wrote:

> On Wed, 2009-08-26 at 15:48 -0400, Steven Rostedt wrote:
> > \
> > @@ -399,16 +413,20 @@ static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
> > { \
> > int ret = 0; \
> > \
> > - if (!atomic_inc_return(&event_call->profile_count)) \
> > + if (!atomic_inc_return(&event_call->profile_count)) { \
> > + event_trace_up_ref(); \
> > ret = register_trace_##call(ftrace_profile_##call); \
> > + } \
> > \
> > return ret; \
> > } \
> > \
> > static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
> > { \
> > - if (atomic_add_negative(-1, &event_call->profile_count)) \
> > + if (atomic_add_negative(-1, &event_call->profile_count)) { \
> > unregister_trace_##call(ftrace_profile_##call); \
> > + event_trace_down_ref(); \
> > + } \
> > }
>
> Ha, almost, make that {un,}register_ftrace_##call() and stick the module
> gunk in there, and I'm ok.

Peter, that {un,}register_tace_##call is the tracepoint code. The
DEFINE_TRACE creates those functions. This is the lowest level we can go
in the ftrace.h file.

-- Steve



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