linux-kernel - [PATCH] tracing: Clean up use of trace_create_maxlat

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Message-ID: <20260206121242.6cb1934d@gandalf.local.home>
Date: Fri, 6 Feb 2026 12:12:42 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>
Subject: [PATCH] tracing: Clean up use of trace_create_maxlat_file()

From: Steven Rostedt <rostedt@...dmis.org>

In trace.c, the function trace_create_maxlat_file() is defined behind the
 #ifdef CONFIG_TRACER_MAX_TRACE block. The #else part defines it as:

 #define trace_create_maxlat_file(tr, d_tracer)				\
	trace_create_file("tracing_max_latency", TRACE_MODE_WRITE,	\
			  d_tracer, tr, &tracing_max_lat_fops)

But the one place that it it used has:

 #ifdef CONFIG_TRACER_MAX_TRACE
	trace_create_maxlat_file(tr, d_tracer);
 #endif

Which is pointless.

Define trace_create_maxlat_file() when CONFIG_TRACER_MAX_TRACE is not
defined as:

 static inline void trace_create_maxlat_file(struct trace_array *tr,
				     struct dentry *d_tracer) { }

And remove the #ifdef's from the code.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index dfa30711c6e2..5bc22d966834 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1547,10 +1547,8 @@ void latency_fsnotify(struct trace_array *tr)
 
 #else /* !LATENCY_FS_NOTIFY */
 
-#define trace_create_maxlat_file(tr, d_tracer)				\
-	trace_create_file("tracing_max_latency", TRACE_MODE_WRITE,	\
-			  d_tracer, tr, &tracing_max_lat_fops)
-
+static inline void trace_create_maxlat_file(struct trace_array *tr,
+					    struct dentry *d_tracer) { }
 #endif
 
 /*
@@ -9909,9 +9907,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 
 	create_trace_options_dir(tr);
 
-#ifdef CONFIG_TRACER_MAX_TRACE
 	trace_create_maxlat_file(tr, d_tracer);
-#endif
 
 	if (ftrace_create_function_files(tr, d_tracer))
 		MEM_FAIL(1, "Could not allocate function filter files");
-- 
2.51.0