linux-kernel - [PATCH v1 06/12] trace: use TP_printk_no

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Date:   Fri,  3 Nov 2023 14:10:05 +0100
From:   Łukasz Bartosik <lb@...ihalf.com>
To:     Jason Baron <jbaron@...mai.com>, Jim Cromie <jim.cromie@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     Guenter Roeck <groeck@...gle.com>,
        Yaniv Tzoreff <yanivt@...gle.com>,
        Benson Leung <bleung@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        upstream@...ihalf.com
Subject: [PATCH v1 06/12] trace: use TP_printk_no_nl in dyndbg:prdbg,devdbg

From: Jim Cromie <jim.cromie@...il.com>

Recently added dyndbg events: prdbg, devdbg have code to strip the
trailing newline, if its there.  Drop that trimming (minimally), and
use the new TP_printk_no_nl macro instead.  Also converting to a
vstring is deferred for now.

This use is slightly premature/overkill, since some pr_debugs do not
have the expected trailing newline.  While those lacks are arguably
bugs, this doesn't fix them.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 include/trace/events/dyndbg.h | 24 ++----------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/include/trace/events/dyndbg.h b/include/trace/events/dyndbg.h
index ccc5bcb070f9..91dcdbe059c0 100644
--- a/include/trace/events/dyndbg.h
+++ b/include/trace/events/dyndbg.h
@@ -20,20 +20,10 @@ TRACE_EVENT(prdbg,
 
 	    TP_fast_assign(
 			__entry->desc = desc;
-			/*
-			 * Each trace entry is printed in a new line.
-			 * If the msg finishes with '\n', cut it off
-			 * to avoid blank lines in the trace.
-			 */
-			if (len > 0 && (text[len - 1] == '\n'))
-				len -= 1;
-
 			memcpy(__get_str(msg), text, len);
-			__get_str(msg)[len] = 0;
 		    ),
 
-	    TP_printk("%s.%s %s", __entry->desc->modname,
-		      __entry->desc->function, __get_str(msg))
+	    TP_printk_no_nl("%s", __get_str(msg))
 );
 
 /* capture dev_dbg() callsite descriptor, device, and message */
@@ -52,20 +42,10 @@ TRACE_EVENT(devdbg,
 	    TP_fast_assign(
 			__entry->desc = desc;
 			__entry->dev = (struct device *) dev;
-			/*
-			 * Each trace entry is printed in a new line.
-			 * If the msg finishes with '\n', cut it off
-			 * to avoid blank lines in the trace.
-			 */
-			if (len > 0 && (text[len - 1] == '\n'))
-				len -= 1;
-
 			memcpy(__get_str(msg), text, len);
-			__get_str(msg)[len] = 0;
 		    ),
 
-	    TP_printk("%s.%s %s", __entry->desc->modname,
-		      __entry->desc->function, __get_str(msg))
+	    TP_printk_no_nl("%s", __get_str(msg))
 );
 
 #endif /* _TRACE_DYNDBG_H */
-- 
2.42.0.869.gea05f2083d-goog