From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>, Shuah Khan <shuah@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [PATCH v2 1/3] tracing: Fix synthetic event to accept unsigned modifier
Date: Thu, 18 Oct 2018 22:12:05 +0900
Message-ID: <153986832571.18251.8448135724590496531.stgit@devbox> (raw)
In-Reply-To: <153986829702.18251.1286066460999338772.stgit@devbox>
Fix synthetic event to accept unsigned modifier for its field type
correctly.
Currently, synthetic_events interface returns error for "unsigned"
modifiers as below;
# echo "myevent unsigned long var" >> synthetic_events
sh: write error: Invalid argument
This is because argv_split() breaks "unsigned long" into "unsigned"
and "long", but parse_synth_field() doesn't expected it.
With this fix, synthetic_events can handle the "unsigned long"
correctly like as below;
# echo "myevent unsigned long var" >> synthetic_events
# cat synthetic_events
myevent unsigned long var
Fixes: commit 4b147936fa50 ("tracing: Add support for 'synthetic' events")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
---
Changes in v2:
- Fix a typo of stable ML.
---
kernel/trace/trace_events_hist.c | 30 ++++++++++++++++++++++++------
1 file changed, 24 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 85f6b01431c7..6ff83941065a 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -738,16 +738,30 @@ static void free_synth_field(struct synth_field *field)
kfree(field);
}
-static struct synth_field *parse_synth_field(char *field_type,
- char *field_name)
+static struct synth_field *parse_synth_field(int argc, char **argv,
+ int *consumed)
{
struct synth_field *field;
+ const char *prefix = NULL;
+ char *field_type = argv[0], *field_name;
int len, ret = 0;
char *array;
if (field_type[0] == ';')
field_type++;
+ if (!strcmp(field_type, "unsigned")) {
+ if (argc < 3)
+ return ERR_PTR(-EINVAL);
+ prefix = "unsigned ";
+ field_type = argv[1];
+ field_name = argv[2];
+ *consumed = 3;
+ } else {
+ field_name = argv[1];
+ *consumed = 2;
+ }
+
len = strlen(field_name);
if (field_name[len - 1] == ';')
field_name[len - 1] = '\0';
@@ -760,11 +774,15 @@ static struct synth_field *parse_synth_field(char *field_type,
array = strchr(field_name, '[');
if (array)
len += strlen(array);
+ if (prefix)
+ len += strlen(prefix);
field->type = kzalloc(len, GFP_KERNEL);
if (!field->type) {
ret = -ENOMEM;
goto free;
}
+ if (prefix)
+ strcat(field->type, prefix);
strcat(field->type, field_type);
if (array) {
strcat(field->type, array);
@@ -1009,7 +1027,7 @@ static int create_synth_event(int argc, char **argv)
struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
struct synth_event *event = NULL;
bool delete_event = false;
- int i, n_fields = 0, ret = 0;
+ int i, consumed = 0, n_fields = 0, ret = 0;
char *name;
mutex_lock(&synth_event_mutex);
@@ -1061,13 +1079,13 @@ static int create_synth_event(int argc, char **argv)
goto err;
}
- field = parse_synth_field(argv[i], argv[i + 1]);
+ field = parse_synth_field(argc - i, &argv[i], &consumed);
if (IS_ERR(field)) {
ret = PTR_ERR(field);
goto err;
}
- fields[n_fields] = field;
- i++; n_fields++;
+ fields[n_fields++] = field;
+ i += consumed - 1;
}
if (i < argc) {
next prev parent reply index
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-18 13:11 [PATCH v2 0/3] tracing: Fix synthetic event parser Masami Hiramatsu
2018-10-18 13:12 ` Masami Hiramatsu [this message]
2018-10-18 13:12 ` [PATCH v2 2/3] tracing: Fix synthetic event to allow semicolon at end Masami Hiramatsu
2018-10-18 13:13 ` [PATCH v2 3/3] selftests: ftrace: Add synthetic event syntax testcase Masami Hiramatsu
2018-10-18 20:34 ` Steven Rostedt
2018-10-18 20:38 ` Shuah Khan
2018-10-18 20:45 ` Steven Rostedt
2018-10-19 0:38 ` Masami Hiramatsu
2018-10-19 0:46 ` Steven Rostedt
2018-10-22 20:10 ` [PATCH v2 0/3] tracing: Fix synthetic event parser Tom Zanussi
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