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tracing/filter: Separate predicate init and filter addition

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Making the code cleaner by having one function to fully prepare
the predicate (create_pred), and another to add the predicate to
the filter (filter_add_pred).

As a benefit, this way the dry_run flag stays only inside the
replace_preds function and is not passed deeper.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-3-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2011-08-11 16:25:46 +02:00 committed by Steven Rostedt
parent 81570d9caa
commit 9d96cd1743
1 changed files with 23 additions and 33 deletions
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56
kernel/trace/trace_events_filter.c
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@ -685,8 +685,7 @@ __pop_pred_stack(struct pred_stack *stack)
static int filter_set_pred(struct event_filter *filter,
int idx,
struct pred_stack *stack,
struct filter_pred *src,
filter_pred_fn_t fn)
struct filter_pred *src)
{
struct filter_pred *dest = &filter->preds[idx];
struct filter_pred *left;
@ -698,7 +697,6 @@ static int filter_set_pred(struct event_filter *filter,
if (!dest->field_name)
return -ENOMEM;
}
dest->fn = fn;
dest->index = idx;
if (dest->op == OP_OR || dest->op == OP_AND) {
@ -836,12 +834,10 @@ static void filter_free_subsystem_filters(struct event_subsystem *system)
}
}
static int filter_add_pred_fn(struct filter_parse_state *ps,
struct ftrace_event_call *call,
struct event_filter *filter,
struct filter_pred *pred,
struct pred_stack *stack,
filter_pred_fn_t fn)
static int filter_add_pred(struct filter_parse_state *ps,
struct event_filter *filter,
struct filter_pred *pred,
struct pred_stack *stack)
{
int idx, err;
@ -852,7 +848,7 @@ static int filter_add_pred_fn(struct filter_parse_state *ps,
idx = filter->n_preds;
filter_clear_pred(&filter->preds[idx]);
err = filter_set_pred(filter, idx, stack, pred, fn);
err = filter_set_pred(filter, idx, stack, pred);
if (err)
return err;
@ -933,25 +929,16 @@ static filter_pred_fn_t select_comparison_fn(int op, int field_size,
return fn;
}
static int filter_add_pred(struct filter_parse_state *ps,
struct ftrace_event_call *call,
struct event_filter *filter,
struct filter_pred *pred,
struct pred_stack *stack,
bool dry_run)
static int init_pred(struct filter_parse_state *ps,
struct ftrace_event_call *call,
struct filter_pred *pred)
{
struct ftrace_event_field *field;
filter_pred_fn_t fn;
filter_pred_fn_t fn = filter_pred_none;
unsigned long long val;
int ret;
fn = pred->fn = filter_pred_none;
if (pred->op == OP_AND)
goto add_pred_fn;
else if (pred->op == OP_OR)
goto add_pred_fn;
field = find_event_field(call, pred->field_name);
if (!field) {
parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
@ -997,9 +984,7 @@ static int filter_add_pred(struct filter_parse_state *ps,
if (pred->op == OP_NE)
pred->not = 1;
add_pred_fn:
if (!dry_run)
return filter_add_pred_fn(ps, call, filter, pred, stack, fn);
pred->fn = fn;
return 0;
}
@ -1299,6 +1284,7 @@ parse_operand:
}
static struct filter_pred *create_pred(struct filter_parse_state *ps,
struct ftrace_event_call *call,
int op, char *operand1, char *operand2)
{
static struct filter_pred pred;
@ -1321,7 +1307,7 @@ static struct filter_pred *create_pred(struct filter_parse_state *ps,
strcpy(pred.regex.pattern, operand2);
pred.regex.len = strlen(pred.regex.pattern);
return &pred;
return init_pred(ps, call, &pred) ? NULL : &pred;
}
static int check_preds(struct filter_parse_state *ps)
@ -1630,16 +1616,20 @@ static int replace_preds(struct ftrace_event_call *call,
goto fail;
}
pred = create_pred(ps, elt->op, operand1, operand2);
pred = create_pred(ps, call, elt->op, operand1, operand2);
if (!pred) {
err = -ENOMEM;
goto fail;
}
err = filter_add_pred(ps, call, filter, pred, &stack, dry_run);
filter_free_pred(pred);
if (err)
goto fail;
if (!dry_run) {
err = filter_add_pred(ps, filter, pred, &stack);
if (err) {
filter_free_pred(pred);
goto fail;
}
}
filter_free_pred(pred);
operand1 = operand2 = NULL;
}