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tracing/kprobes: Add failure messages for debugging

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Add verbose failure messages to kprobe-tracer for debugging.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20091017000728.16556.16713.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-10-16 20:07:28 -04:00 committed by Ingo Molnar
parent f397af06e4
commit e63cc2397e
1 changed files with 27 additions and 8 deletions
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35
kernel/trace/trace_kprobe.c
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@ -597,15 +597,19 @@ static int create_trace_probe(int argc, char **argv)
void *addr = NULL;
char buf[MAX_EVENT_NAME_LEN];
if (argc < 2)
if (argc < 2) {
pr_info("Probe point is not specified.\n");
return -EINVAL;
}
if (argv[0][0] == 'p')
is_return = 0;
else if (argv[0][0] == 'r')
is_return = 1;
else
else {
pr_info("Probe definition must be started with 'p' or 'r'.\n");
return -EINVAL;
}
if (argv[0][1] == ':') {
event = &argv[0][2];
@ -625,21 +629,29 @@ static int create_trace_probe(int argc, char **argv)
}
if (isdigit(argv[1][0])) {
if (is_return)
if (is_return) {
pr_info("Return probe point must be a symbol.\n");
return -EINVAL;
}
/* an address specified */
ret = strict_strtoul(&argv[0][2], 0, (unsigned long *)&addr);
if (ret)
if (ret) {
pr_info("Failed to parse address.\n");
return ret;
}
} else {
/* a symbol specified */
symbol = argv[1];
/* TODO: support .init module functions */
ret = split_symbol_offset(symbol, &offset);
if (ret)
if (ret) {
pr_info("Failed to parse symbol.\n");
return ret;
if (offset && is_return)
}
if (offset && is_return) {
pr_info("Return probe must be used without offset.\n");
return -EINVAL;
}
}
argc -= 2; argv += 2;
@ -658,8 +670,11 @@ static int create_trace_probe(int argc, char **argv)
}
tp = alloc_trace_probe(group, event, addr, symbol, offset, argc,
is_return);
if (IS_ERR(tp))
if (IS_ERR(tp)) {
pr_info("Failed to allocate trace_probe.(%d)\n",
(int)PTR_ERR(tp));
return PTR_ERR(tp);
}
/* parse arguments */
ret = 0;
@ -672,6 +687,8 @@ static int create_trace_probe(int argc, char **argv)
arg = argv[i];
if (conflict_field_name(argv[i], tp->args, i)) {
pr_info("Argument%d name '%s' conflicts with "
"another field.\n", i, argv[i]);
ret = -EINVAL;
goto error;
}
@ -685,8 +702,10 @@ static int create_trace_probe(int argc, char **argv)
goto error;
}
ret = parse_probe_arg(arg, &tp->args[i].fetch, is_return);
if (ret)
if (ret) {
pr_info("Parse error at argument%d. (%d)\n", i, ret);
goto error;
}
}
tp->nr_args = i;