linux-kernel - [PATCH] trace/ring_buffer: remove unused arguments

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Date:   Thu, 20 Oct 2022 22:06:51 +0800
From:   Song Chen <chensong_2000@....cn>
To:     rostedt@...dmis.org, mingo@...hat.com, mhiramat@...nel.org
Cc:     linux-kernel@...r.kernel.org, xiehuan09@...il.com,
        Song Chen <chensong_2000@....cn>
Subject: [PATCH] trace/ring_buffer: remove unused arguments

As a argument, event has nothing to do with either
ring_buffer_unlock_commit or rb_commit and cleaning
it up has no side effect.

Signed-off-by: Song Chen <chensong_2000@....cn>
---
 include/linux/ring_buffer.h          |  3 +--
 kernel/trace/ring_buffer.c           | 12 +++++-------
 kernel/trace/ring_buffer_benchmark.c |  2 +-
 kernel/trace/trace.c                 |  2 +-
 4 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index dac53fd3afea..a1483e5dd846 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -113,8 +113,7 @@ void ring_buffer_change_overwrite(struct trace_buffer *buffer, int val);
 
 struct ring_buffer_event *ring_buffer_lock_reserve(struct trace_buffer *buffer,
 						   unsigned long length);
-int ring_buffer_unlock_commit(struct trace_buffer *buffer,
-			      struct ring_buffer_event *event);
+int ring_buffer_unlock_commit(struct trace_buffer *buffer);
 int ring_buffer_write(struct trace_buffer *buffer,
 		      unsigned long length, void *data);
 
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index d59b6a328b7f..fbadfeff6542 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -3088,8 +3088,7 @@ static inline void rb_event_discard(struct ring_buffer_event *event)
 		event->time_delta = 1;
 }
 
-static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
-		      struct ring_buffer_event *event)
+static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer)
 {
 	local_inc(&cpu_buffer->entries);
 	rb_end_commit(cpu_buffer);
@@ -3298,15 +3297,14 @@ void ring_buffer_nest_end(struct trace_buffer *buffer)
  *
  * Must be paired with ring_buffer_lock_reserve.
  */
-int ring_buffer_unlock_commit(struct trace_buffer *buffer,
-			      struct ring_buffer_event *event)
+int ring_buffer_unlock_commit(struct trace_buffer *buffer)
 {
 	struct ring_buffer_per_cpu *cpu_buffer;
 	int cpu = raw_smp_processor_id();
 
 	cpu_buffer = buffer->buffers[cpu];
 
-	rb_commit(cpu_buffer, event);
+	rb_commit(cpu_buffer);
 
 	rb_wakeups(buffer, cpu_buffer);
 
@@ -3892,7 +3890,7 @@ int ring_buffer_write(struct trace_buffer *buffer,
 
 	memcpy(body, data, length);
 
-	rb_commit(cpu_buffer, event);
+	rb_commit(cpu_buffer);
 
 	rb_wakeups(buffer, cpu_buffer);
 
@@ -5877,7 +5875,7 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested)
 	}
 
  out:
-	ring_buffer_unlock_commit(data->buffer, event);
+	ring_buffer_unlock_commit(data->buffer);
 
 	return 0;
 }
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index 78e576575b79..aef34673d79d 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -258,7 +258,7 @@ static void ring_buffer_producer(void)
 				hit++;
 				entry = ring_buffer_event_data(event);
 				*entry = smp_processor_id();
-				ring_buffer_unlock_commit(buffer, event);
+				ring_buffer_unlock_commit(buffer);
 			}
 		}
 		end_time = ktime_get();
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 31dd208a3d4e..d79d1a341f38 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -999,7 +999,7 @@ __buffer_unlock_commit(struct trace_buffer *buffer, struct ring_buffer_event *ev
 		/* ring_buffer_unlock_commit() enables preemption */
 		preempt_enable_notrace();
 	} else
-		ring_buffer_unlock_commit(buffer, event);
+		ring_buffer_unlock_commit(buffer);
 }
 
 /**
-- 
2.25.1