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authorMasami Hiramatsu <mhiramat@kernel.org>2019-03-31 18:48:19 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-04-02 18:24:07 -0400
commitab105a4fb89496c71c5a0f3222347c506c30feb0 (patch)
treeda80bd38ba018fa16b460171b7da52117974aa15 /kernel/trace/trace_uprobe.c
parent34f76afaac7a437a2ce381225135563928b359dd (diff)
tracing: Use tracing error_log with probe events
Use tracing error_log with probe events for logging error more precisely. This also makes all parse error returns -EINVAL (except for -ENOMEM), because user can see better error message in error_log file now. Link: http://lkml.kernel.org/r/6a4d90e141d138040ea61f4776b991597077451e.1554072478.git.tom.zanussi@linux.intel.com Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_uprobe.c')
-rw-r--r--kernel/trace/trace_uprobe.c44
1 files changed, 31 insertions, 13 deletions
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index be78d99ee6bc..cd8750a72768 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -457,13 +457,19 @@ static int trace_uprobe_create(int argc, const char **argv)
return -ECANCELED;
}
+ trace_probe_log_init("trace_uprobe", argc, argv);
+ trace_probe_log_set_index(1); /* filename is the 2nd argument */
+
*arg++ = '\0';
ret = kern_path(filename, LOOKUP_FOLLOW, &path);
if (ret) {
+ trace_probe_log_err(0, FILE_NOT_FOUND);
kfree(filename);
+ trace_probe_log_clear();
return ret;
}
if (!d_is_reg(path.dentry)) {
+ trace_probe_log_err(0, NO_REGULAR_FILE);
ret = -EINVAL;
goto fail_address_parse;
}
@@ -472,9 +478,16 @@ static int trace_uprobe_create(int argc, const char **argv)
rctr = strchr(arg, '(');
if (rctr) {
rctr_end = strchr(rctr, ')');
- if (rctr > rctr_end || *(rctr_end + 1) != 0) {
+ if (!rctr_end) {
+ ret = -EINVAL;
+ rctr_end = rctr + strlen(rctr);
+ trace_probe_log_err(rctr_end - filename,
+ REFCNT_OPEN_BRACE);
+ goto fail_address_parse;
+ } else if (rctr_end[1] != '\0') {
ret = -EINVAL;
- pr_info("Invalid reference counter offset.\n");
+ trace_probe_log_err(rctr_end + 1 - filename,
+ BAD_REFCNT_SUFFIX);
goto fail_address_parse;
}
@@ -482,22 +495,23 @@ static int trace_uprobe_create(int argc, const char **argv)
*rctr_end = '\0';
ret = kstrtoul(rctr, 0, &ref_ctr_offset);
if (ret) {
- pr_info("Invalid reference counter offset.\n");
+ trace_probe_log_err(rctr - filename, BAD_REFCNT);
goto fail_address_parse;
}
}
/* Parse uprobe offset. */
ret = kstrtoul(arg, 0, &offset);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS);
goto fail_address_parse;
-
- argc -= 2;
- argv += 2;
+ }
/* setup a probe */
+ trace_probe_log_set_index(0);
if (event) {
- ret = traceprobe_parse_event_name(&event, &group, buf);
+ ret = traceprobe_parse_event_name(&event, &group, buf,
+ event - argv[0]);
if (ret)
goto fail_address_parse;
} else {
@@ -519,6 +533,9 @@ static int trace_uprobe_create(int argc, const char **argv)
kfree(tail);
}
+ argc -= 2;
+ argv += 2;
+
tu = alloc_trace_uprobe(group, event, argc, is_return);
if (IS_ERR(tu)) {
ret = PTR_ERR(tu);
@@ -539,6 +556,7 @@ static int trace_uprobe_create(int argc, const char **argv)
goto error;
}
+ trace_probe_log_set_index(i + 2);
ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
is_return ? TPARG_FL_RETURN : 0);
kfree(tmp);
@@ -547,20 +565,20 @@ static int trace_uprobe_create(int argc, const char **argv)
}
ret = register_trace_uprobe(tu);
- if (ret)
- goto error;
- return 0;
+ if (!ret)
+ goto out;
error:
free_trace_uprobe(tu);
+out:
+ trace_probe_log_clear();
return ret;
fail_address_parse:
+ trace_probe_log_clear();
path_put(&path);
kfree(filename);
- pr_info("Failed to parse address or file.\n");
-
return ret;
}