[PATCH 13/13] mac80211: tracing: Use the new __vstring() helper

[Steven Rostedt]

From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>

Instead of open coding a __dynamic_array() with a fixed length (which
defeats the purpose of the dynamic array in the first place). Use the new
__vstring() helper that will use a va_list and only write enough of the
string into the ring buffer that is needed.

Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: linux-wireless@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
 net/mac80211/trace_msg.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/trace_msg.h b/net/mac80211/trace_msg.h
index 40141df09f25..c9dbe9aab7bd 100644
--- a/net/mac80211/trace_msg.h
+++ b/net/mac80211/trace_msg.h
@@ -24,13 +24,11 @@ DECLARE_EVENT_CLASS(mac80211_msg_event,
 	TP_ARGS(vaf),
 
 	TP_STRUCT__entry(
-		__dynamic_array(char, msg, MAX_MSG_LEN)
+		__vstring(msg, vaf->fmt, vaf->va)
 	),
 
 	TP_fast_assign(
-		WARN_ON_ONCE(vsnprintf(__get_dynamic_array(msg),
-				       MAX_MSG_LEN, vaf->fmt,
-				       *vaf->va) >= MAX_MSG_LEN);
+		__assign_vstr(msg, vaf->fmt, vaf->va);
 	),
 
 	TP_printk("%s", __get_str(msg))
-- 
2.35.1