linux-kernel - [PATCH] ring-buffer: Simplify reset_disabled_cpu

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Message-ID: <20250527144623.77a9cc47@gandalf.local.home>
Date: Tue, 27 May 2025 14:46:23 -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>
Subject: [PATCH] ring-buffer: Simplify reset_disabled_cpu_buffer() with use
 of guard()

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

Use guard(raw_spinlock_irqsave)() in reset_disabled_cpu_buffer() to
simplify the locking.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/ring_buffer.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 10a4b26929ae..0b21d64e90c8 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -6112,21 +6112,16 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
 /* Must have disabled the cpu buffer then done a synchronize_rcu */
 static void reset_disabled_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
 {
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+	guard(raw_spinlock_irqsave)(&cpu_buffer->reader_lock);
 
 	if (RB_WARN_ON(cpu_buffer, local_read(&cpu_buffer->committing)))
-		goto out;
+		return;
 
 	arch_spin_lock(&cpu_buffer->lock);
 
 	rb_reset_cpu(cpu_buffer);
 
 	arch_spin_unlock(&cpu_buffer->lock);
-
- out:
-	raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 }
 
 /**
-- 
2.47.2