[PATCH 3/5] tracing: save one trace_event->type by using __TRACE_LAST_TYPE

From: Wei Yang
Date: Thu Jul 02 2020 - 22:06:30 EST


Static defined trace_event->type stops at (__TRACE_LAST_TYPE - 1) and
dynamic trace_event->type starts from (__TRACE_LAST_TYPE + 1).

To save one trace_event->type index, let's use __TRACE_LAST_TYPE.

Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_output.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index b704b3ef4264..818f0c9d10c5 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -20,7 +20,7 @@ DECLARE_RWSEM(trace_event_sem);

static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;

-static int next_event_type = __TRACE_LAST_TYPE + 1;
+static int next_event_type = __TRACE_LAST_TYPE;

enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
{
@@ -675,7 +675,7 @@ static LIST_HEAD(ftrace_event_list);
static int trace_search_list(struct list_head **list)
{
struct trace_event *e;
- int next = __TRACE_LAST_TYPE + 1;
+ int next = __TRACE_LAST_TYPE;

if (list_empty(&ftrace_event_list)) {
*list = &ftrace_event_list;
--
2.20.1 (Apple Git-117)