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tracing/eprobe: Show syntax error logs in error_log file 

Show the syntax errors for event probes in error_log file as same as
other dynamic events, so that user can understand what is the problem.

Link: https://lkml.kernel.org/r/165932113556.2850673.3483079297896607612.stgit@devnote2

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google) 2022-08-01 11:32:15 +09:00 committed by Steven Rostedt (Google)
parent 95522f0b18
commit 2f63e5d2e3
2 changed files with 13 additions and 3 deletions
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11
kernel/trace/trace_eprobe.c
View File

@ -839,8 +839,11 @@ static int trace_eprobe_tp_update_arg(struct trace_eprobe *ep, const char *argv[
if (ret)
return ret;
if (ep->tp.args[i].code->op == FETCH_OP_TP_ARG)
if (ep->tp.args[i].code->op == FETCH_OP_TP_ARG) {
ret = trace_eprobe_tp_arg_update(ep, i);
if (ret)
trace_probe_log_err(0, BAD_ATTACH_ARG);
}
return ret;
}
@ -880,8 +883,10 @@ static int __trace_eprobe_create(int argc, const char *argv[])
trace_probe_log_set_index(1);
sys_event = argv[1];
ret = traceprobe_parse_event_name(&sys_event, &sys_name, buf2, 0);
if (!sys_event || !sys_name)
if (!sys_event || !sys_name) {
trace_probe_log_err(0, NO_EVENT_INFO);
goto parse_error;
}
if (!event) {
strscpy(buf1, argv[1], MAX_EVENT_NAME_LEN);
@ -896,6 +901,8 @@ static int __trace_eprobe_create(int argc, const char *argv[])
if (IS_ERR(ep)) {
ret = PTR_ERR(ep);
if (ret == -ENODEV)
trace_probe_log_err(0, BAD_ATTACH_EVENT);
/* This must return -ENOMEM or missing event, else there is a bug */
WARN_ON_ONCE(ret != -ENOMEM && ret != -ENODEV);
ep = NULL;

5
kernel/trace/trace_probe.h
View File

@ -442,7 +442,10 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
C(FAIL_REG_PROBE, "Failed to register probe event"),\
C(DIFF_PROBE_TYPE, "Probe type is different from existing probe"),\
C(DIFF_ARG_TYPE, "Argument type or name is different from existing probe"),\
C(SAME_PROBE, "There is already the exact same probe event"),
C(SAME_PROBE, "There is already the exact same probe event"),\
C(NO_EVENT_INFO, "This requires both group and event name to attach"),\
C(BAD_ATTACH_EVENT, "Attached event does not exist"),\
C(BAD_ATTACH_ARG, "Attached event does not have this field"),
#undef C
#define C(a, b) TP_ERR_##a