linux-kernel - [PATCH] trace/hwlat: Add WARN_ON in move_to_next

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Message-ID: <20250811080109.8417-1-wangfushuai@baidu.com>
Date: Mon, 11 Aug 2025 16:01:09 +0800
From: Fushuai Wang <wangfushuai@...du.com>
To: <linux-trace-kernel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <rostedt@...dmis.org>, <mhiramat@...nel.org>,
	<mathieu.desnoyers@...icios.com>, Fushuai Wang <wangfushuai@...du.com>
Subject: [PATCH] trace/hwlat: Add WARN_ON in move_to_next_cpu()

Add a WARN_ON check in move_to_next_cpu(). Next_cpu should
never be greater than or equal to nr_cpu_ids.

Signed-off-by: Fushuai Wang <wangfushuai@...du.com>
---
 kernel/trace/trace_hwlat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 2f7b94e98317..5024b0dcdbba 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -328,7 +328,7 @@ static void move_to_next_cpu(void)
 	next_cpu = cpumask_next_wrap(raw_smp_processor_id(), current_mask);
 	cpus_read_unlock();
 
-	if (next_cpu >= nr_cpu_ids) /* Shouldn't happen! */
+	if (WARN_ON(next_cpu >= nr_cpu_ids)) /* Shouldn't happen! */
 		goto change_mode;
 
 	cpumask_clear(current_mask);
-- 
2.36.1