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Code Issues Releases Wiki Activity

tracing/kprobe: Set print format right after parsed command

Browse source 
Set event call's print format right after parsed command for
simplifying (un)register_kprobe_event().

Link: http://lkml.kernel.org/r/155931580625.28323.5158822928646225903.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2019-06-01 00:16:46 +09:00 committed by Steven Rostedt (VMware)
parent 65fc965c70
commit f730e0f2da
1 changed files with 9 additions and 16 deletions
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25
kernel/trace/trace_kprobe.c
View file

@ -272,6 +272,7 @@ static void free_trace_kprobe(struct trace_kprobe *tk)
kfree(tk->tp.call.class->system);
kfree(tk->tp.call.name);
kfree(tk->tp.call.print_fmt);
kfree(tk->symbol);
free_percpu(tk->nhit);
kfree(tk);
@ -730,6 +731,10 @@ static int trace_kprobe_create(int argc, const char *argv[])
goto error; /* This can be -ENOMEM */
}
ret = traceprobe_set_print_fmt(&tk->tp, is_return);
if (ret < 0)
goto error;
ret = register_trace_kprobe(tk);
if (ret) {
trace_probe_log_set_index(1);
@ -1416,18 +1421,14 @@ static int register_kprobe_event(struct trace_kprobe *tk)
init_trace_event_call(tk, call);
if (traceprobe_set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0)
return -ENOMEM;
ret = register_trace_event(&call->event);
if (!ret) {
kfree(call->print_fmt);
if (!ret)
return -ENODEV;
}
ret = trace_add_event_call(call);
if (ret) {
pr_info("Failed to register kprobe event: %s\n",
trace_event_name(call));
kfree(call->print_fmt);
unregister_trace_event(&call->event);
}
return ret;
@ -1435,13 +1436,8 @@ static int register_kprobe_event(struct trace_kprobe *tk)
static int unregister_kprobe_event(struct trace_kprobe *tk)
{
int ret;
/* tp->event is unregistered in trace_remove_event_call() */
ret = trace_remove_event_call(&tk->tp.call);
if (!ret)
kfree(tk->tp.call.print_fmt);
return ret;
return trace_remove_event_call(&tk->tp.call);
}
#ifdef CONFIG_PERF_EVENTS
@ -1479,10 +1475,8 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
}
ret = __register_trace_kprobe(tk);
if (ret < 0) {
kfree(tk->tp.call.print_fmt);
if (ret < 0)
goto error;
}
return &tk->tp.call;
error:
@ -1503,7 +1497,6 @@ void destroy_local_trace_kprobe(struct trace_event_call *event_call)
__unregister_trace_kprobe(tk);
kfree(tk->tp.call.print_fmt);
free_trace_kprobe(tk);
}
#endif /* CONFIG_PERF_EVENTS */