linux-kernel - Re: [PATCH v6 1/1] serial: core: Start managing serial controllers to enable runtime PM

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Date:   Tue, 14 Mar 2023 09:06:22 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     kernel test robot <lkp@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        oe-kbuild-all@...ts.linux.dev,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v6 1/1] serial: core: Start managing serial controllers
 to enable runtime PM

Hi,

* Andy Shevchenko <andriy.shevchenko@...el.com> [230310 13:46]:
> On Fri, Mar 10, 2023 at 08:52:38AM +0200, Tony Lindgren wrote:
> > * kernel test robot <lkp@...el.com> [230309 21:31]:
> > > >> drivers/tty/serial/serial_ctrl.c:17:34: warning: 'serial_ctrl_pm' defined but not used [-Wunused-const-variable=]
> > >       17 | static DEFINE_RUNTIME_DEV_PM_OPS(serial_ctrl_pm, NULL, NULL, NULL);
> > >          |                                  ^~~~~~~~~~~~~~
> > 
> > Thanks I'll tag it with __maybe_unused.
> 
> It requires to use pm_ptr() macro, it was designed exactly to *not* spread
> __maybe_unused.

Heh yeah.. Turns out the issue here is that the serial_ctrl_pm ops is not
used at all for serial_ctrl.c and can be just dropped.

Regards,

Tony