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

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Date:   Thu, 16 Mar 2023 11:11:46 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "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 Thu, Mar 16, 2023 at 3:38 AM Daniel Bristot de Oliveira
<bristot@...nel.org> wrote:
>
> 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!

 - Joel