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-rw-r--r--kernel/trace/trace_events.c60
1 files changed, 22 insertions, 38 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 7a75cb22eab7..76defd91f9b4 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -826,59 +826,33 @@ enum {
static void *f_next(struct seq_file *m, void *v, loff_t *pos)
{
struct ftrace_event_call *call = m->private;
- struct ftrace_event_field *field;
struct list_head *common_head = &ftrace_common_fields;
struct list_head *head = trace_get_fields(call);
+ struct list_head *node = v;
(*pos)++;
switch ((unsigned long)v) {
case FORMAT_HEADER:
- if (unlikely(list_empty(common_head)))
- return NULL;
-
- field = list_entry(common_head->prev,
- struct ftrace_event_field, link);
- return field;
+ node = common_head;
+ break;
case FORMAT_FIELD_SEPERATOR:
- if (unlikely(list_empty(head)))
- return NULL;
-
- field = list_entry(head->prev, struct ftrace_event_field, link);
- return field;
+ node = head;
+ break;
case FORMAT_PRINTFMT:
/* all done */
return NULL;
}
- field = v;
- if (field->link.prev == common_head)
+ node = node->prev;
+ if (node == common_head)
return (void *)FORMAT_FIELD_SEPERATOR;
- else if (field->link.prev == head)
+ else if (node == head)
return (void *)FORMAT_PRINTFMT;
-
- field = list_entry(field->link.prev, struct ftrace_event_field, link);
-
- return field;
-}
-
-static void *f_start(struct seq_file *m, loff_t *pos)
-{
- loff_t l = 0;
- void *p;
-
- /* Start by showing the header */
- if (!*pos)
- return (void *)FORMAT_HEADER;
-
- p = (void *)FORMAT_HEADER;
- do {
- p = f_next(m, p, &l);
- } while (p && l < *pos);
-
- return p;
+ else
+ return node;
}
static int f_show(struct seq_file *m, void *v)
@@ -904,8 +878,7 @@ static int f_show(struct seq_file *m, void *v)
return 0;
}
- field = v;
-
+ field = list_entry(v, struct ftrace_event_field, link);
/*
* Smartly shows the array type(except dynamic array).
* Normal:
@@ -932,6 +905,17 @@ static int f_show(struct seq_file *m, void *v)
return 0;
}
+static void *f_start(struct seq_file *m, loff_t *pos)
+{
+ void *p = (void *)FORMAT_HEADER;
+ loff_t l = 0;
+
+ while (l < *pos && p)
+ p = f_next(m, p, &l);
+
+ return p;
+}
+
static void f_stop(struct seq_file *m, void *p)
{
}