linux-kernel - Re: [PATCH v2 03/14] tracing: Rename kvfree_rcu() to kvfree_rcu

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Date:   Thu, 16 Mar 2023 08:38:14 +0100
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/14] tracing: Rename kvfree_rcu() to
 kvfree_rcu_mightsleep()

On 3/15/23 19:18, Joel Fernandes (Google) wrote:
> From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
> 
> The kvfree_rcu() macro's single-argument form is deprecated.  Therefore
> switch to the new kvfree_rcu_mightsleep() variant. The goal is to
> avoid accidental use of the single-argument forms, which can introduce
> functionality bugs in atomic contexts and latency bugs in non-atomic
> contexts.
> 
> Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> ---
>  kernel/trace/trace_osnoise.c | 2 +-
>  kernel/trace/trace_probe.c   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
> index 04f0fdae19a1..f68ca1e6460f 100644
> --- a/kernel/trace/trace_osnoise.c
> +++ b/kernel/trace/trace_osnoise.c
> @@ -159,7 +159,7 @@ static void osnoise_unregister_instance(struct trace_array *tr)
>  	if (!found)
>  		return;
>  
> -	kvfree_rcu(inst);
> +	kvfree_rcu_mightsleep(inst);
>  }
>  
>  /*

Acked-by: Daniel Bristot de Oliveira <bristot@...nel.org>

Thanks!
-- Daniel