tracepoint_add_func

Name:Add the probe function to a tracepoint.

Proto:static int tracepoint_add_func(struct tracepoint *tp, struct tracepoint_func *func, int prio)

Type:int

Parameter:

Type	Parameter	Name
struct tracepoint *	tp
struct tracepoint_func *	func
int	prio

233

If regfunc && Not static_key_enabled( & key) Then

234

ret = regfunc()

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If ret < 0 Then Return ret

239

tp_funcs = cu_dereference_protected() - fetch RCU pointer when updates prevented*@p: The pointer to read, prior to dereferencing*@c: The conditions under which the dereference will take place* Return the value of the specified RCU-protected pointer, but omit(funcs, lockdep_is_held( & racepoints_mutex protects the builtin and module tracepoints.* tracepoints_mutex nests inside tracepoint_module_list_mutex.))

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old = func_add( & tp_funcs, func, prio)

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If IS_ERR(old) Then

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WARN_ON_ONCE(PTR_ERR(old) != - ENOMEM)

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Return PTR_ERR(old)

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cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(funcs, tp_funcs)

254

If Not static_key_enabled( & key) Then static_key_slow_inc( & key)

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release_probes(old)

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Return 0

**Caller**
Name	Describe
tracepoint_probe_register_prio	racepoint_probe_register_prio - Connect a probe to a tracepoint with priority@tp: tracepoint@probe: probe handler@data: tracepoint data@prio: priority of this function over other registered functions* Returns 0 if ok, error value on error

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