linux-kernel - Re: [RFC][PATCH] ACPI: tracing: Have ACPI debug go to tracing ring buffer

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Message-ID: <CAJZ5v0ib+Xg_tXb9yURFt91kJ9cFT48KzLaOjJ94gefRHCMbag@mail.gmail.com>
Date:   Thu, 5 Jan 2023 15:55:33 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Brian Norris <briannorris@...omium.org>,
        Ross Zwisler <zwisler@...gle.com>,
        Ching-lin Yu <chinglinyu@...gle.com>
Subject: Re: [RFC][PATCH] ACPI: tracing: Have ACPI debug go to tracing ring buffer

On Wed, Jan 4, 2023 at 10:39 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Fri, 30 Dec 2022 16:52:36 +0100
> "Rafael J. Wysocki" <rafael@...nel.org> wrote:
>
> > Personally, I would use a command line option to control the behavior
> > and the Kconfig option to provide its default value.
> >
>
> I can add that.
>
> > This way it can be flipped without rebuilding the kernel if need be.
> >
> > I would also make the ACPI debug output go into the trace buffer so
> > long as the Kconfig option is not changed or the command line option
> > is not flipped.
>
> Not sure what you mean by the above? You mean to make going to both as the
> default?

No, just send them to the trace buffer alone unless specifically told
to printk() them.