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Date: Fri, 16 Oct 2020 16:48:23 -0500
From: Tom Zanussi <zanussi@...nel.org>
To: rostedt@...dmis.org, axelrasmussen@...gle.com
Cc: mhiramat@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] tracing: Use new trace_run_command() options
Now that the synthetic event command passes in ';' as an additional
separator to trace_parse_run_command(), all of the parsing related to
semicolon can be removed.
Additionally, the since create_or_delete_synth_event() now receives
the raw command string, it doesn't need save_cmdstr(), which can also
be removed.
Signed-off-by: Tom Zanussi <zanussi@...nel.org>
---
kernel/trace/trace_events_synth.c | 65 ++++---------------------------
1 file changed, 8 insertions(+), 57 deletions(-)
diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index e6659bb9a500..2333025ef31e 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -48,7 +48,7 @@ static int errpos(const char *str)
return err_pos(last_cmd, str);
}
-static void last_cmd_set(char *str)
+static void last_cmd_set(const char *str)
{
if (!str)
return;
@@ -587,9 +587,6 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
int len, ret = 0;
ssize_t size;
- if (field_type[0] == ';')
- field_type++;
-
if (!strcmp(field_type, "unsigned")) {
if (argc < 3) {
synth_err(SYNTH_ERR_INCOMPLETE_TYPE, errpos(field_type));
@@ -612,8 +609,6 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
array = strchr(field_name, '[');
if (array)
len -= strlen(array);
- else if (field_name[len - 1] == ';')
- len--;
field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
if (!field->name) {
@@ -626,17 +621,11 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
goto free;
}
- if (field_type[0] == ';')
- field_type++;
len = strlen(field_type) + 1;
- if (array) {
- int l = strlen(array);
+ if (array)
+ len += strlen(array);
- if (l && array[l - 1] == ';')
- l--;
- len += l;
- }
if (prefix)
len += strlen(prefix);
@@ -648,11 +637,8 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
if (prefix)
strcat(field->type, prefix);
strcat(field->type, field_type);
- if (array) {
+ if (array)
strcat(field->type, array);
- if (field->type[len - 1] == ';')
- field->type[len - 1] = '\0';
- }
size = synth_field_size(field->type);
if (size < 0) {
@@ -1155,47 +1141,12 @@ int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd, const char *name,
}
EXPORT_SYMBOL_GPL(synth_event_gen_cmd_array_start);
-static int save_cmdstr(int argc, const char *name, const char **argv)
-{
- struct seq_buf s;
- char *buf;
- int i;
-
- buf = kzalloc(MAX_DYNEVENT_CMD_LEN, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- seq_buf_init(&s, buf, MAX_DYNEVENT_CMD_LEN);
-
- seq_buf_puts(&s, name);
-
- for (i = 0; i < argc; i++) {
- seq_buf_putc(&s, ' ');
- seq_buf_puts(&s, argv[i]);
- }
-
- if (!seq_buf_buffer_left(&s)) {
- synth_err(SYNTH_ERR_CMD_TOO_LONG, 0);
- kfree(buf);
- return -EINVAL;
- }
- buf[s.len] = 0;
- last_cmd_set(buf);
-
- kfree(buf);
- return 0;
-}
-
static int __create_synth_event(int argc, const char *name, const char **argv)
{
struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
struct synth_event *event = NULL;
int i, consumed = 0, n_fields = 0, ret = 0;
- ret = save_cmdstr(argc, name, argv);
- if (ret)
- return ret;
-
/*
* Argument syntax:
* - Add synthetic event: <event_name> field[;field] ...
@@ -1224,8 +1175,6 @@ static int __create_synth_event(int argc, const char *name, const char **argv)
}
for (i = 0; i < argc - 1; i++) {
- if (strcmp(argv[i], ";") == 0)
- continue;
if (n_fields == SYNTH_FIELDS_MAX) {
synth_err(SYNTH_ERR_TOO_MANY_FIELDS, 0);
ret = -EINVAL;
@@ -1241,7 +1190,7 @@ static int __create_synth_event(int argc, const char *name, const char **argv)
i += consumed - 1;
}
- if (i < argc && strcmp(argv[i], ";") != 0) {
+ if (i < argc) {
synth_err(SYNTH_ERR_INVALID_FIELD, errpos(argv[i]));
ret = -EINVAL;
goto err;
@@ -1384,6 +1333,8 @@ static int create_or_delete_synth_event(int argc, char **argv,
const char *name = argv[0];
int ret;
+ last_cmd_set(raw_cmd);
+
/* trace_run_command() ensures argc != 0 */
if (name[0] == '!') {
ret = synth_event_delete(name + 1);
@@ -1399,7 +1350,7 @@ static int synth_event_run_command(struct dynevent_cmd *cmd)
struct synth_event *se;
int ret;
- ret = trace_run_command(cmd->seq.buffer, create_or_delete_synth_event);
+ ret = trace_run_command_add_sep(cmd->seq.buffer, create_or_delete_synth_event, ';');
if (ret)
return ret;
--
2.17.1
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