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Subject[PATCH 06/20] tracing/filter: Remove field_name from filter_pred struct
From: Jiri Olsa <jolsa@redhat.com>

The field_name was used just for finding event's fields. This way we
don't need to care about field_name allocation/free.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-4-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/trace.h | 11 +-------
kernel/trace/trace_events_filter.c | 53 ++++++++---------------------------
2 files changed, 13 insertions(+), 51 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 616846b..2eb3cf6 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -761,16 +761,7 @@ struct filter_pred {
filter_pred_fn_t fn;
u64 val;
struct regex regex;
- /*
- * Leaf nodes use field_name, ops is used by AND and OR
- * nodes. The field_name is always freed when freeing a pred.
- * We can overload field_name for ops and have it freed
- * as well.
- */
- union {
- char *field_name;
- unsigned short *ops;
- };
+ unsigned short *ops;
int offset;
int not;
int op;
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 61c8dec..97b93f3 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -628,18 +628,6 @@ find_event_field(struct ftrace_event_call *call, char *name)
return __find_event_field(head, name);
}

-static void filter_free_pred(struct filter_pred *pred)
-{
- kfree(pred->field_name);
-}
-
-static void filter_clear_pred(struct filter_pred *pred)
-{
- kfree(pred->field_name);
- pred->field_name = NULL;
- pred->regex.len = 0;
-}
-
static int __alloc_pred_stack(struct pred_stack *stack, int n_preds)
{
stack->preds = kzalloc(sizeof(*stack->preds)*(n_preds + 1), GFP_KERNEL);
@@ -692,11 +680,6 @@ static int filter_set_pred(struct event_filter *filter,
struct filter_pred *right;

*dest = *src;
- if (src->field_name) {
- dest->field_name = kstrdup(src->field_name, GFP_KERNEL);
- if (!dest->field_name)
- return -ENOMEM;
- }
dest->index = idx;

if (dest->op == OP_OR || dest->op == OP_AND) {
@@ -737,11 +720,7 @@ static int filter_set_pred(struct event_filter *filter,

static void __free_preds(struct event_filter *filter)
{
- int i;
-
if (filter->preds) {
- for (i = 0; i < filter->a_preds; i++)
- kfree(filter->preds[i].field_name);
kfree(filter->preds);
filter->preds = NULL;
}
@@ -839,16 +818,14 @@ static int filter_add_pred(struct filter_parse_state *ps,
struct filter_pred *pred,
struct pred_stack *stack)
{
- int idx, err;
+ int err;

if (WARN_ON(filter->n_preds == filter->a_preds)) {
parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
return -ENOSPC;
}

- idx = filter->n_preds;
- filter_clear_pred(&filter->preds[idx]);
- err = filter_set_pred(filter, idx, stack, pred);
+ err = filter_set_pred(filter, filter->n_preds, stack, pred);
if (err)
return err;

@@ -930,21 +907,14 @@ static filter_pred_fn_t select_comparison_fn(int op, int field_size,
}

static int init_pred(struct filter_parse_state *ps,
- struct ftrace_event_call *call,
+ struct ftrace_event_field *field,
struct filter_pred *pred)

{
- struct ftrace_event_field *field;
filter_pred_fn_t fn = filter_pred_none;
unsigned long long val;
int ret;

- field = find_event_field(call, pred->field_name);
- if (!field) {
- parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
- return -EINVAL;
- }
-
pred->offset = field->offset;

if (!is_legal_op(field, pred->op)) {
@@ -1287,6 +1257,7 @@ static struct filter_pred *create_pred(struct filter_parse_state *ps,
struct ftrace_event_call *call,
int op, char *operand1, char *operand2)
{
+ struct ftrace_event_field *field;
static struct filter_pred pred;

memset(&pred, 0, sizeof(pred));
@@ -1300,14 +1271,16 @@ static struct filter_pred *create_pred(struct filter_parse_state *ps,
return NULL;
}

- pred.field_name = kstrdup(operand1, GFP_KERNEL);
- if (!pred.field_name)
+ field = find_event_field(call, operand1);
+ if (!field) {
+ parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
return NULL;
+ }

strcpy(pred.regex.pattern, operand2);
pred.regex.len = strlen(pred.regex.pattern);

- return init_pred(ps, call, &pred) ? NULL : &pred;
+ return init_pred(ps, field, &pred) ? NULL : &pred;
}

static int check_preds(struct filter_parse_state *ps)
@@ -1618,18 +1591,16 @@ static int replace_preds(struct ftrace_event_call *call,

pred = create_pred(ps, call, elt->op, operand1, operand2);
if (!pred) {
- err = -ENOMEM;
+ err = -EINVAL;
goto fail;
}
+
if (!dry_run) {
err = filter_add_pred(ps, filter, pred, &stack);
- if (err) {
- filter_free_pred(pred);
+ if (err)
goto fail;
- }
}

- filter_free_pred(pred);
operand1 = operand2 = NULL;
}

--
1.7.6.3

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