linux-kernel - [PATCH] neighbor: tracing: Have neigh_create event use _

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Message-ID: <20220705183741.35387e3f@rorschach.local.home>
Date:   Tue, 5 Jul 2022 18:37:41 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     David Ahern <dsahern@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH] neighbor: tracing: Have neigh_create event use __string()

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

The dev field of the neigh_create event uses __dynamic_array() with a
fixed size, which defeats the purpose of __dynamic_array(). Looking at the
logic, as it already uses __assign_str(), just use the same logic in
__string to create the size needed. It appears that because "dev" can be
NULL, it needs the check. But __string() can have the same checks as
__assign_str() so use them there too.

Cc: David Ahern <dsahern@...il.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---

[ This is simpler logic than the fib* events, so I figured just
  convert to __string() instead of a static __array() ]

 include/trace/events/neigh.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/trace/events/neigh.h b/include/trace/events/neigh.h
index 62bb17516713..5eaa1fa99171 100644
--- a/include/trace/events/neigh.h
+++ b/include/trace/events/neigh.h
@@ -30,7 +30,7 @@ TRACE_EVENT(neigh_create,
 
 	TP_STRUCT__entry(
 		__field(u32, family)
-		__dynamic_array(char,  dev,   IFNAMSIZ )
+		__string(dev, dev ? dev->name : "NULL")
 		__field(int, entries)
 		__field(u8, created)
 		__field(u8, gc_exempt)
-- 
2.35.1