linux-kernel - [PATCH] tracing: Export tracing_start() and tracing

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Message-ID: <20210602080118.21627-1-vincent.whitchurch@axis.com>
Date:   Wed, 2 Jun 2021 10:01:18 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
CC:     <kernel@...s.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] tracing: Export tracing_start() and tracing_stop()

tracing_stop() is very useful during hands-on debugging for getting the
trace to stop exactly when the problem is detected.  Export this to
modules.

Personally, I haven't yet found the need to use tracing_start() from
code since I usually start tracing via tracefs, but export that too for
symmetry since it may have its uses together with tracing_stop().

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 kernel/trace/trace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a21ef9cd2aae..5fa36f0705b7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2301,6 +2301,7 @@ void tracing_start(void)
  out:
 	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
 }
+EXPORT_SYMBOL_GPL(tracing_start);
 
 static void tracing_start_tr(struct trace_array *tr)
 {
@@ -2366,6 +2367,7 @@ void tracing_stop(void)
  out:
 	raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
 }
+EXPORT_SYMBOL_GPL(tracing_stop);
 
 static void tracing_stop_tr(struct trace_array *tr)
 {
-- 
2.28.0