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tracing/probe: Add trace_event_call accesses APIs

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Add trace_event_call access APIs for trace_probe.
Instead of accessing trace_probe.call directly, use those
accesses by trace_probe_event_call() method. This hides
the relationship of trace_event_call and trace_probe from
trace_kprobe and trace_uprobe.

Link: http://lkml.kernel.org/r/155931587711.28323.8335129014686133120.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 00:17:57 +09:00
committed by Steven Rostedt (VMware)
parent b55ce203a8
commit e3dc9f898e
4 changed files with 40 additions and 28 deletions
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24
kernel/trace/trace_probe.c
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@@ -844,6 +844,7 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return)
{
struct trace_event_call *call = trace_probe_event_call(tp);
int len;
char *print_fmt;
@@ -855,7 +856,7 @@ int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return)
/* Second: actually write the @print_fmt */
__set_print_fmt(tp, print_fmt, len + 1, is_return);
tp->call.print_fmt = print_fmt;
call->print_fmt = print_fmt;
return 0;
}
@@ -888,31 +889,34 @@ int traceprobe_define_arg_fields(struct trace_event_call *event_call,
void trace_probe_cleanup(struct trace_probe *tp)
{
struct trace_event_call *call = trace_probe_event_call(tp);
int i;
for (i = 0; i < tp->nr_args; i++)
traceprobe_free_probe_arg(&tp->args[i]);
kfree(tp->call.class->system);
kfree(tp->call.name);
kfree(tp->call.print_fmt);
kfree(call->class->system);
kfree(call->name);
kfree(call->print_fmt);
}
int trace_probe_init(struct trace_probe *tp, const char *event,
const char *group)
{
struct trace_event_call *call = trace_probe_event_call(tp);
if (!event || !group)
return -EINVAL;
tp->call.class = &tp->class;
tp->call.name = kstrdup(event, GFP_KERNEL);
if (!tp->call.name)
call->class = &tp->class;
call->name = kstrdup(event, GFP_KERNEL);
if (!call->name)
return -ENOMEM;
tp->class.system = kstrdup(group, GFP_KERNEL);
if (!tp->class.system) {
kfree(tp->call.name);
tp->call.name = NULL;
kfree(call->name);
call->name = NULL;
return -ENOMEM;
}
INIT_LIST_HEAD(&tp->files);
@@ -923,7 +927,7 @@ int trace_probe_init(struct trace_probe *tp, const char *event,
int trace_probe_register_event_call(struct trace_probe *tp)
{
struct trace_event_call *call = &tp->call;
struct trace_event_call *call = trace_probe_event_call(tp);
int ret;
ret = register_trace_event(&call->event);