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authorJiri Olsa <jolsa@redhat.com>2011-08-11 16:25:46 +0200
committerSteven Rostedt <rostedt@goodmis.org>2011-08-19 14:35:51 -0400
commit9d96cd1743547f07a8a6c51a3f7741cfca0a0bee (patch)
treeb013bf238a63661eccb7134b0e9631ff09464a47 /kernel/trace
parent81570d9caaad46a056580c9af078c5c55e6c764f (diff)
downloadlinux-9d96cd1743547f07a8a6c51a3f7741cfca0a0bee.tar.bz2
tracing/filter: Separate predicate init and filter addition
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_events_filter.c56
1 files changed, 23 insertions, 33 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index cb295a117ee7..61c8dec3b2b7 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -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;
}