linux-kernel - [for-next][PATCH 02/21] batman-adv: tracing: Use the new _

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Message-ID: <20220731190432.106094347@goodmis.org>
Date:   Sun, 31 Jul 2022 15:03:31 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marek Lindner <mareklindner@...mailbox.ch>,
        Simon Wunderlich <sw@...onwunderlich.de>,
        Antonio Quartulli <a@...table.cc>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
        Sven Eckelmann <sven@...fation.org>
Subject: [for-next][PATCH 02/21] batman-adv: tracing: Use the new __vstring() helper

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

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.

Link: https://lkml.kernel.org/r/20220724191650.236b1355@rorschach.local.home

Cc: Marek Lindner <mareklindner@...mailbox.ch>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Simon Wunderlich <sw@...onwunderlich.de>
Cc: Antonio Quartulli <a@...table.cc>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: b.a.t.m.a.n@...ts.open-mesh.org
Cc: netdev@...r.kernel.org
Acked-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 net/batman-adv/trace.h | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/net/batman-adv/trace.h b/net/batman-adv/trace.h
index d673ebdd0426..31c8f922651d 100644
--- a/net/batman-adv/trace.h
+++ b/net/batman-adv/trace.h
@@ -28,8 +28,6 @@
 
 #endif /* CONFIG_BATMAN_ADV_TRACING */
 
-#define BATADV_MAX_MSG_LEN	256
-
 TRACE_EVENT(batadv_dbg,
 
 	    TP_PROTO(struct batadv_priv *bat_priv,
@@ -40,16 +38,13 @@ TRACE_EVENT(batadv_dbg,
 	    TP_STRUCT__entry(
 		    __string(device, bat_priv->soft_iface->name)
 		    __string(driver, KBUILD_MODNAME)
-		    __dynamic_array(char, msg, BATADV_MAX_MSG_LEN)
+		    __vstring(msg, vaf->fmt, vaf->va)
 	    ),
 
 	    TP_fast_assign(
 		    __assign_str(device, bat_priv->soft_iface->name);
 		    __assign_str(driver, KBUILD_MODNAME);
-		    WARN_ON_ONCE(vsnprintf(__get_dynamic_array(msg),
-					   BATADV_MAX_MSG_LEN,
-					   vaf->fmt,
-					   *vaf->va) >= BATADV_MAX_MSG_LEN);
+		    __assign_vstr(msg, vaf->fmt, vaf->va);
 	    ),
 
 	    TP_printk(
-- 
2.35.1