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authorTom Zanussi <zanussi@kernel.org>2020-01-31 15:55:31 -0600
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-01-31 18:35:17 -0500
commit249d7b2ef674cdae28c377cfe6f56696548305d5 (patch)
treed93bafddf525efe45410389e5b4b9753d1b9365d /kernel
parentd380dcde9a07ca5de4805dee11f58a98ec0ad6ff (diff)
tracing: Consolidate some synth_event_trace code
The synth_event trace code contains some almost identical functions and some small functions that are called only once - consolidate the common code into single functions and fold in the small functions to simplify the code overall. Link: http://lkml.kernel.org/r/d1c8d8ad124a653b7543afe801d38c199ca5c20e.1580506712.git.zanussi@kernel.org Signed-off-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events_hist.c141
1 files changed, 57 insertions, 84 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 5b4e04780411..42058a1b5146 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2053,24 +2053,72 @@ out:
}
EXPORT_SYMBOL_GPL(synth_event_trace_start);
-static int save_synth_val(struct synth_field *field, u64 val,
- struct synth_event_trace_state *trace_state)
+static int __synth_event_add_val(const char *field_name, u64 val,
+ struct synth_event_trace_state *trace_state)
{
- struct synth_trace_event *entry = trace_state->entry;
+ struct synth_field *field = NULL;
+ struct synth_trace_event *entry;
+ struct synth_event *event;
+ int i, ret = 0;
+
+ if (!trace_state) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* can't mix add_next_synth_val() with add_synth_val() */
+ if (field_name) {
+ if (trace_state->add_next) {
+ ret = -EINVAL;
+ goto out;
+ }
+ trace_state->add_name = true;
+ } else {
+ if (trace_state->add_name) {
+ ret = -EINVAL;
+ goto out;
+ }
+ trace_state->add_next = true;
+ }
+
+ if (!trace_state->enabled)
+ goto out;
+
+ event = trace_state->event;
+ if (trace_state->add_name) {
+ for (i = 0; i < event->n_fields; i++) {
+ field = event->fields[i];
+ if (strcmp(field->name, field_name) == 0)
+ break;
+ }
+ if (!field) {
+ ret = -EINVAL;
+ goto out;
+ }
+ } else {
+ if (trace_state->cur_field >= event->n_fields) {
+ ret = -EINVAL;
+ goto out;
+ }
+ field = event->fields[trace_state->cur_field++];
+ }
+ entry = trace_state->entry;
if (field->is_string) {
char *str_val = (char *)(long)val;
char *str_field;
- if (!str_val)
- return -EINVAL;
+ if (!str_val) {
+ ret = -EINVAL;
+ goto out;
+ }
str_field = (char *)&entry->fields[field->offset];
strscpy(str_field, str_val, STR_VAR_LEN_MAX);
} else
entry->fields[field->offset] = val;
-
- return 0;
+ out:
+ return ret;
}
/**
@@ -2104,54 +2152,10 @@ static int save_synth_val(struct synth_field *field, u64 val,
int synth_event_add_next_val(u64 val,
struct synth_event_trace_state *trace_state)
{
- struct synth_field *field;
- struct synth_event *event;
- int ret = 0;
-
- if (!trace_state) {
- ret = -EINVAL;
- goto out;
- }
-
- /* can't mix add_next_synth_val() with add_synth_val() */
- if (trace_state->add_name) {
- ret = -EINVAL;
- goto out;
- }
- trace_state->add_next = true;
-
- if (!trace_state->enabled)
- goto out;
-
- event = trace_state->event;
-
- if (trace_state->cur_field >= event->n_fields) {
- ret = -EINVAL;
- goto out;
- }
-
- field = event->fields[trace_state->cur_field++];
- ret = save_synth_val(field, val, trace_state);
- out:
- return ret;
+ return __synth_event_add_val(NULL, val, trace_state);
}
EXPORT_SYMBOL_GPL(synth_event_add_next_val);
-static struct synth_field *find_synth_field(struct synth_event *event,
- const char *field_name)
-{
- struct synth_field *field = NULL;
- unsigned int i;
-
- for (i = 0; i < event->n_fields; i++) {
- field = event->fields[i];
- if (strcmp(field->name, field_name) == 0)
- return field;
- }
-
- return NULL;
-}
-
/**
* synth_event_add_val - Add a named field's value to an open synth trace
* @field_name: The name of the synthetic event field value to set
@@ -2183,38 +2187,7 @@ static struct synth_field *find_synth_field(struct synth_event *event,
int synth_event_add_val(const char *field_name, u64 val,
struct synth_event_trace_state *trace_state)
{
- struct synth_trace_event *entry;
- struct synth_event *event;
- struct synth_field *field;
- int ret = 0;
-
- if (!trace_state) {
- ret = -EINVAL;
- goto out;
- }
-
- /* can't mix add_next_synth_val() with add_synth_val() */
- if (trace_state->add_next) {
- ret = -EINVAL;
- goto out;
- }
- trace_state->add_name = true;
-
- if (!trace_state->enabled)
- goto out;
-
- event = trace_state->event;
- entry = trace_state->entry;
-
- field = find_synth_field(event, field_name);
- if (!field) {
- ret = -EINVAL;
- goto out;
- }
-
- ret = save_synth_val(field, val, trace_state);
- out:
- return ret;
+ return __synth_event_add_val(field_name, val, trace_state);
}
EXPORT_SYMBOL_GPL(synth_event_add_val);