linux-kernel - [PATCH 3/4] PM: tracing: Hide device_pm_callback events under PM

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Message-ID: <20250612145408.246703478@goodmis.org>
Date: Thu, 12 Jun 2025 10:53:13 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 3/4] PM: tracing: Hide device_pm_callback events under PM_SLEEP

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

The events device_pm_callback_start and device_pm_callback_end events are
only called when CONFIG_PM_SLEEP is defined. As each event can take up to
5K regardless if they are used or not, it's best not to define them when
they are not used. Add #ifdef around these events when they are not used.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 include/trace/events/power.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index a10ad300d660..5b1df5e1e092 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -212,6 +212,7 @@ TRACE_EVENT(cpu_frequency_limits,
 		  (unsigned long)__entry->cpu_id)
 );

+#ifdef CONFIG_PM_SLEEP
 TRACE_EVENT(device_pm_callback_start,

 	TP_PROTO(struct device *dev, const char *pm_ops, int event),
@@ -260,6 +261,7 @@ TRACE_EVENT(device_pm_callback_end,
 	TP_printk("%s %s, err=%d",
 		__get_str(driver), __get_str(device), __entry->error)
 );
+#endif

 TRACE_EVENT(suspend_resume,

-- 
2.47.2