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tracing: Use seq_buf for building dynevent_cmd string 

The dynevent_cmd commands that build up the command string don't need
to do that themselves - there's a seq_buf facility that does pretty
much the same thing those command are doing manually, so use it
instead.

Link: http://lkml.kernel.org/r/eb8a6e835c964d0ab8a38cbf5ffa60746b54a465.1580506712.git.zanussi@kernel.org

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2020-01-31 15:55:34 -06:00 committed by Steven Rostedt (VMware)
parent e9260f6257
commit 2b90927c77
4 changed files with 16 additions and 40 deletions
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4
include/linux/trace_events.h
View File

@ -367,10 +367,8 @@ struct dynevent_cmd;
typedef int (*dynevent_create_fn_t)(struct dynevent_cmd *cmd);
struct dynevent_cmd {
char *buf;
struct seq_buf seq;
const char *event_name;
int maxlen;
int remaining;
unsigned int n_fields;
enum dynevent_type type;
dynevent_create_fn_t run_command;

48
kernel/trace/trace_dynevent.c
View File

@ -247,8 +247,6 @@ int dynevent_arg_add(struct dynevent_cmd *cmd,
dynevent_check_arg_fn_t check_arg)
{
int ret = 0;
int delta;
char *q;
if (check_arg) {
ret = check_arg(arg);
@ -256,14 +254,11 @@ int dynevent_arg_add(struct dynevent_cmd *cmd,
return ret;
}
q = cmd->buf + (cmd->maxlen - cmd->remaining);
delta = snprintf(q, cmd->remaining, " %s%c", arg->str, arg->separator);
if (delta >= cmd->remaining) {
pr_err("String is too long: %s\n", arg->str);
ret = seq_buf_printf(&cmd->seq, " %s%c", arg->str, arg->separator);
if (ret) {
pr_err("String is too long: %s%c\n", arg->str, arg->separator);
return -E2BIG;
}
cmd->remaining -= delta;
return ret;
}
@ -297,8 +292,6 @@ int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
dynevent_check_arg_fn_t check_arg)
{
int ret = 0;
int delta;
char *q;
if (check_arg) {
ret = check_arg(arg_pair);
@ -306,23 +299,15 @@ int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
return ret;
}
q = cmd->buf + (cmd->maxlen - cmd->remaining);
delta = snprintf(q, cmd->remaining, " %s%c", arg_pair->lhs,
arg_pair->operator);
if (delta >= cmd->remaining) {
pr_err("field string is too long: %s\n", arg_pair->lhs);
ret = seq_buf_printf(&cmd->seq, " %s%c%s%c", arg_pair->lhs,
arg_pair->operator, arg_pair->rhs,
arg_pair->separator);
if (ret) {
pr_err("field string is too long: %s%c%s%c\n", arg_pair->lhs,
arg_pair->operator, arg_pair->rhs,
arg_pair->separator);
return -E2BIG;
}
cmd->remaining -= delta; q += delta;
delta = snprintf(q, cmd->remaining, "%s%c", arg_pair->rhs,
arg_pair->separator);
if (delta >= cmd->remaining) {
pr_err("field string is too long: %s\n", arg_pair->rhs);
return -E2BIG;
}
cmd->remaining -= delta;
return ret;
}
@ -340,17 +325,12 @@ int dynevent_arg_pair_add(struct dynevent_cmd *cmd,
int dynevent_str_add(struct dynevent_cmd *cmd, const char *str)
{
int ret = 0;
int delta;
char *q;
q = cmd->buf + (cmd->maxlen - cmd->remaining);
delta = snprintf(q, cmd->remaining, "%s", str);
if (delta >= cmd->remaining) {
ret = seq_buf_puts(&cmd->seq, str);
if (ret) {
pr_err("String is too long: %s\n", str);
return -E2BIG;
}
cmd->remaining -= delta;
return ret;
}
@ -381,9 +361,7 @@ void dynevent_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen,
{
memset(cmd, '\0', sizeof(*cmd));
cmd->buf = buf;
cmd->maxlen = maxlen;
cmd->remaining = cmd->maxlen;
seq_buf_init(&cmd->seq, buf, maxlen);
cmd->type = type;
cmd->run_command = run_command;
}

2
kernel/trace/trace_events_hist.c
View File

@ -1762,7 +1762,7 @@ static int synth_event_run_command(struct dynevent_cmd *cmd)
struct synth_event *se;
int ret;
ret = trace_run_command(cmd->buf, create_or_delete_synth_event);
ret = trace_run_command(cmd->seq.buffer, create_or_delete_synth_event);
if (ret)
return ret;

2
kernel/trace/trace_kprobe.c
View File

@ -903,7 +903,7 @@ static int create_or_delete_trace_kprobe(int argc, char **argv)
static int trace_kprobe_run_command(struct dynevent_cmd *cmd)
{
return trace_run_command(cmd->buf, create_or_delete_trace_kprobe);
return trace_run_command(cmd->seq.buffer, create_or_delete_trace_kprobe);
}
/**