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tracing/filter: Use static allocation for filter predicates

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Don't dynamically allocate filter_pred struct, use static memory.
This way we can get rid of the code managing the dynamic filter_pred
struct object.

The create_pred function integrates create_logical_pred function.
This way the static predicate memory is returned only from
one place.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-2-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2011-08-11 16:25:45 +02:00 committed by Steven Rostedt
parent 2f3aa7a06f
commit 81570d9caa
1 changed files with 16 additions and 41 deletions
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57
kernel/trace/trace_events_filter.c
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@ -630,11 +630,7 @@ find_event_field(struct ftrace_event_call *call, char *name)
static void filter_free_pred(struct filter_pred *pred)
{
if (!pred)
return;
kfree(pred->field_name);
kfree(pred);
}
static void filter_clear_pred(struct filter_pred *pred)
@ -1302,39 +1298,30 @@ static int filter_parse(struct filter_parse_state *ps)
return 0;
}
static struct filter_pred *create_pred(int op, char *operand1, char *operand2)
static struct filter_pred *create_pred(struct filter_parse_state *ps,
int op, char *operand1, char *operand2)
{
struct filter_pred *pred;
static struct filter_pred pred;
pred = kzalloc(sizeof(*pred), GFP_KERNEL);
if (!pred)
return NULL;
memset(&pred, 0, sizeof(pred));
pred.op = op;
pred->field_name = kstrdup(operand1, GFP_KERNEL);
if (!pred->field_name) {
kfree(pred);
if (op == OP_AND || op == OP_OR)
return &pred;
if (!operand1 || !operand2) {
parse_error(ps, FILT_ERR_MISSING_FIELD, 0);
return NULL;
}
strcpy(pred->regex.pattern, operand2);
pred->regex.len = strlen(pred->regex.pattern);
pred->op = op;
return pred;
}
static struct filter_pred *create_logical_pred(int op)
{
struct filter_pred *pred;
pred = kzalloc(sizeof(*pred), GFP_KERNEL);
if (!pred)
pred.field_name = kstrdup(operand1, GFP_KERNEL);
if (!pred.field_name)
return NULL;
pred->op = op;
strcpy(pred.regex.pattern, operand2);
pred.regex.len = strlen(pred.regex.pattern);
return pred;
return &pred;
}
static int check_preds(struct filter_parse_state *ps)
@ -1643,19 +1630,7 @@ static int replace_preds(struct ftrace_event_call *call,
goto fail;
}
if (elt->op == OP_AND || elt->op == OP_OR) {
pred = create_logical_pred(elt->op);
goto add_pred;
}
if (!operand1 || !operand2) {
parse_error(ps, FILT_ERR_MISSING_FIELD, 0);
err = -EINVAL;
goto fail;
}
pred = create_pred(elt->op, operand1, operand2);
add_pred:
pred = create_pred(ps, elt->op, operand1, operand2);
if (!pred) {
err = -ENOMEM;
goto fail;