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tracing/filter: Remove field_name from filter_pred struct 

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>
This commit is contained in:
Jiri Olsa 2011-08-11 16:25:47 +02:00 committed by Steven Rostedt
parent 9d96cd1743
commit 61aaef5530
2 changed files with 13 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/trace/trace.h
View File

@ -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;

53
kernel/trace/trace_events_filter.c
View File

@ -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;
}