linux-kernel - [PATCH] tracing/ipi: Hide ARM specific IPI trace events from other architectures

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Message-ID: <20250612093802.77cdcc9c@batman.local.home>
Date: Thu, 12 Jun 2025 09:38:02 -0400
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>, Peter Zijlstra <peterz@...radead.org>,
 Mark Rutland <mark.rutland@....com>, Valentin Schneider
 <vschneid@...hat.com>
Subject: [PATCH] tracing/ipi: Hide ARM specific IPI trace events from other
 architectures

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

The IPI trace events ipi_raise, ipi_handler, ipi_entry and ipi_exit are
only used by the arm and arm64 architectures. As each trace event can take
up to 5K in size, regardless if they are used or not, add #ifdef around
these events so that they are only defined for arm and they do not waste
memory in other architectures.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
Note, I'll be adding code soon that will make unused events cause a warning.

 include/trace/events/ipi.h | 58 ++++++++++++++++++++------------------
 1 file changed, 30 insertions(+), 28 deletions(-)

diff --git a/include/trace/events/ipi.h b/include/trace/events/ipi.h
index 3de9bfc982ce..e5c7998f636c 100644
--- a/include/trace/events/ipi.h
+++ b/include/trace/events/ipi.h
@@ -7,34 +7,6 @@
 
 #include <linux/tracepoint.h>
 
-/**
- * ipi_raise - called when a smp cross call is made
- *
- * @mask: mask of recipient CPUs for the IPI
- * @reason: string identifying the IPI purpose
- *
- * It is necessary for @reason to be a static string declared with
- * __tracepoint_string.
- */
-TRACE_EVENT(ipi_raise,
-
-	TP_PROTO(const struct cpumask *mask, const char *reason),
-
-	TP_ARGS(mask, reason),
-
-	TP_STRUCT__entry(
-		__bitmask(target_cpus, nr_cpumask_bits)
-		__field(const char *, reason)
-	),
-
-	TP_fast_assign(
-		__assign_bitmask(target_cpus, cpumask_bits(mask), nr_cpumask_bits);
-		__entry->reason = reason;
-	),
-
-	TP_printk("target_mask=%s (%s)", __get_bitmask(target_cpus), __entry->reason)
-);
-
 TRACE_EVENT(ipi_send_cpu,
 
 	TP_PROTO(const unsigned int cpu, unsigned long callsite, void *callback),
@@ -79,6 +51,35 @@ TRACE_EVENT(ipi_send_cpumask,
 		  __get_cpumask(cpumask), __entry->callsite, __entry->callback)
 );
 
+#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+/**
+ * ipi_raise - called when a smp cross call is made
+ *
+ * @mask: mask of recipient CPUs for the IPI
+ * @reason: string identifying the IPI purpose
+ *
+ * It is necessary for @reason to be a static string declared with
+ * __tracepoint_string.
+ */
+TRACE_EVENT(ipi_raise,
+
+	TP_PROTO(const struct cpumask *mask, const char *reason),
+
+	TP_ARGS(mask, reason),
+
+	TP_STRUCT__entry(
+		__bitmask(target_cpus, nr_cpumask_bits)
+		__field(const char *, reason)
+	),
+
+	TP_fast_assign(
+		__assign_bitmask(target_cpus, cpumask_bits(mask), nr_cpumask_bits);
+		__entry->reason = reason;
+	),
+
+	TP_printk("target_mask=%s (%s)", __get_bitmask(target_cpus), __entry->reason)
+);
+
 DECLARE_EVENT_CLASS(ipi_handler,
 
 	TP_PROTO(const char *reason),
@@ -127,6 +128,7 @@ DEFINE_EVENT(ipi_handler, ipi_exit,
 
 	TP_ARGS(reason)
 );
+#endif /* defined(CONFIG_ARM) || defined(CONFIG_ARM64) */
 
 #endif /* _TRACE_IPI_H */
 
-- 
2.47.2