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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) {


  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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