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

[kernel test robot]

Hi Tony,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tty/tty-testing]
[also build test WARNING on tty/tty-next tty/tty-linus rafael-pm/linux-next usb/usb-testing usb/usb-next usb/usb-linus linus/master v6.3-rc1 next-20230309]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Tony-Lindgren/serial-core-Start-managing-serial-controllers-to-enable-runtime-PM/20230309-170149
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
patch link:    https://lore.kernel.org/r/20230309085713.57700-1-tony%40atomide.com
patch subject: [PATCH v6 1/1] serial: core: Start managing serial controllers to enable runtime PM
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20230310/202303100516.22vtkWv4-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/08f76f28e32bcd3c093e4af349b0e1b60328395e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tony-Lindgren/serial-core-Start-managing-serial-controllers-to-enable-runtime-PM/20230309-170149
        git checkout 08f76f28e32bcd3c093e4af349b0e1b60328395e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/tty/serial/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202303100516.22vtkWv4-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from include/linux/device.h:25,
                    from include/linux/pm_runtime.h:11,
                    from drivers/tty/serial/serial_ctrl.c:12:
>> 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);
         |                                  ^~~~~~~~~~~~~~
   include/linux/pm.h:372:25: note: in definition of macro '_DEFINE_DEV_PM_OPS'
     372 | const struct dev_pm_ops name = { \
         |                         ^~~~
   drivers/tty/serial/serial_ctrl.c:17:8: note: in expansion of macro 'DEFINE_RUNTIME_DEV_PM_OPS'
      17 | static DEFINE_RUNTIME_DEV_PM_OPS(serial_ctrl_pm, NULL, NULL, NULL);
         |        ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/serial_ctrl_pm +17 drivers/tty/serial/serial_ctrl.c

     2	
     3	/*
     4	 * Serial core controller driver
     5	 *
     6	 * This driver manages the serial core controller struct device instances.
     7	 * The serial core controller devices are children of the physical serial
     8	 * port device.
     9	 */
    10	
    11	#include <linux/module.h>
  > 12	#include <linux/pm_runtime.h>
    13	#include <linux/serial_core.h>
    14	
    15	#include "serial_base.h"
    16	
  > 17	static DEFINE_RUNTIME_DEV_PM_OPS(serial_ctrl_pm, NULL, NULL, NULL);
    18	

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