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tracing: Have the reg function allow to fail

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Some tracepoints have a registration function that gets enabled when the
tracepoint is enabled. There may be cases that the registraction function
must fail (for example, can't allocate enough memory). In this case, the
tracepoint should also fail to register, otherwise the user would not know
why the tracepoint is not working.

Cc: David Howells <dhowells@redhat.com>
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2016-11-28 13:03:21 -05:00
committed by Steven Rostedt
parent 38e11df134
commit 8cf868affd
15 changed files with 34 additions and 20 deletions
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3
samples/trace_events/trace-events-sample.c
View File

@@ -79,7 +79,7 @@ static int simple_thread_fn(void *arg)
static DEFINE_MUTEX(thread_mutex);
void foo_bar_reg(void)
int foo_bar_reg(void)
{
pr_info("Starting thread for foo_bar_fn\n");
/*
@@ -90,6 +90,7 @@ void foo_bar_reg(void)
mutex_lock(&thread_mutex);
simple_tsk_fn = kthread_run(simple_thread_fn, NULL, "event-sample-fn");
mutex_unlock(&thread_mutex);
return 0;
}
void foo_bar_unreg(void)

2
samples/trace_events/trace-events-sample.h
View File

@@ -354,7 +354,7 @@ TRACE_EVENT_CONDITION(foo_bar_with_cond,
TP_printk("foo %s %d", __get_str(foo), __entry->bar)
);
void foo_bar_reg(void);
int foo_bar_reg(void);
void foo_bar_unreg(void);
/*