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Subject[PATCH 1/4] tracing: introduce for_each_token macro
Date
Introduce for_each_token macro to parse the trace event list.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
kernel/trace/trace_events.c | 14 ++++++--------
1 files changed, 6 insertions(+), 8 deletions(-)
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 0725eea..fe15b7c 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1218,6 +1218,11 @@ void trace_remove_event_call(struct ftrace_event_call *call)
mutex_unlock(&event_mutex);
}

+#define for_each_token(token, buf) \
+ for (token = strsep(&buf, ","); \
+ token && *token; \
+ token = strsep(&buf, ","))
+
#define for_each_event(event, start, end) \
for (event = start; \
(unsigned long)event < (unsigned long)end; \
@@ -1430,14 +1435,7 @@ static __init int event_trace_init(void)
&ftrace_event_format_fops);
}

- while (true) {
- token = strsep(&buf, ",");
-
- if (!token)
- break;
- if (!*token)
- continue;
-
+ for_each_token(token, buf) {
ret = ftrace_set_clr_event(token, 1);
if (ret)
pr_warning("Failed to enable trace event: %s\n", token);
--
1.7.2.3


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