linux-kernel - Re: [PATCH v2] rcu-tasks: Update show_rcu_tasks_trace_gp

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Message-ID: <20240327125132.600d62a3@gandalf.local.home>
Date: Wed, 27 Mar 2024 12:51:32 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Nikita Kiryushin <kiryushin@...ud.ru>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, Frederic Weisbecker
 <frederic@...nel.org>, Neeraj Upadhyay <quic_neeraju@...cinc.com>, Joel
 Fernandes <joel@...lfernandes.org>, Josh Triplett <josh@...htriplett.org>,
 Boqun Feng <boqun.feng@...il.com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Lai Jiangshan <jiangshanlai@...il.com>,
 Zqiang <qiang.zhang1211@...il.com>, rcu@...r.kernel.org,
 linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH v2] rcu-tasks: Update show_rcu_tasks_trace_gp_kthread
 buffer size

On Wed, 27 Mar 2024 19:36:56 +0300
Nikita Kiryushin <kiryushin@...ud.ru> wrote:

> diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
> index 147b5945d67a..963ecae3c8e6 100644
> --- a/kernel/rcu/tasks.h
> +++ b/kernel/rcu/tasks.h
> @@ -1994,7 +1994,7 @@ void show_rcu_tasks_trace_gp_kthread(void)
>  {
>  	char buf[64];
>  
> -	sprintf(buf, "N%lu h:%lu/%lu/%lu",
> +	snprintf(buf, ARRAY_SIZE(buf), "N%lu h:%lu/%lu/%lu",

Nit, but I would have used sizeof(buf) instead of ARRAY_SIZE(buf) as that's
more common practice for this type of code.

[ do a: git grep 'sizeof(buf)' ]

-- Steve

>  		data_race(n_trc_holdouts),
>  		data_race(n_heavy_reader_ofl_updates),
>  		data_race(n_heavy_reader_updates),