Hi Ville,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-tip/drm-tip]
[cannot apply to drm-i915/for-linux-next drm-i915/for-linux-next-fixes linus/master v6.18 next-20251208]
[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/Ville-Syrjala/drm-i915-vga-Register-vgaarb-client-later/20251209-030730
base:   https://gitlab.freedesktop.org/drm/tip.git drm-tip
patch link:    https://lore.kernel.org/r/20251208182637.334-15-ville.syrjala%40linux.intel.com
patch subject: [PATCH 14/19] video/vga: Add VGA_IS0_R
config: i386-randconfig-141-20251209 (https://download.01.org/0day-ci/archive/20251209/202512090603.ycfxEuHJ-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251209/202512090603.ycfxEuHJ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202512090603.ycfxEuHJ-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/tiny/bochs.c:29:
   include/video/vga.h:489:1: error: expected identifier or '(' before '?' token
     489 | ?
         | ^
   In file included from include/linux/module.h:23,
                    from drivers/gpu/drm/tiny/bochs.c:5:
   drivers/gpu/drm/tiny/bochs.c: In function '__check_modeset':
   drivers/gpu/drm/tiny/bochs.c:66:29: error: 'bochs_modeset' undeclared (first use in this function)
      66 | module_param_named(modeset, bochs_modeset, int, 0444);
         |                             ^~~~~~~~~~~~~
   include/linux/moduleparam.h:430:75: note: in definition of macro '__param_check'
     430 |         static inline type __always_unused *__check_##name(void) { return(p); }
         |                                                                           ^
   include/linux/moduleparam.h:155:9: note: in expansion of macro 'param_check_int'
     155 |         param_check_##type(name, &(value));                                \
         |         ^~~~~~~~~~~~
   drivers/gpu/drm/tiny/bochs.c:66:1: note: in expansion of macro 'module_param_named'
      66 | module_param_named(modeset, bochs_modeset, int, 0444);
         | ^~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tiny/bochs.c:66:29: note: each undeclared identifier is reported only once for each function it appears in
      66 | module_param_named(modeset, bochs_modeset, int, 0444);
         |                             ^~~~~~~~~~~~~
   include/linux/moduleparam.h:430:75: note: in definition of macro '__param_check'
     430 |         static inline type __always_unused *__check_##name(void) { return(p); }
         |                                                                           ^
   include/linux/moduleparam.h:155:9: note: in expansion of macro 'param_check_int'
     155 |         param_check_##type(name, &(value));                                \
         |         ^~~~~~~~~~~~
   drivers/gpu/drm/tiny/bochs.c:66:1: note: in expansion of macro 'module_param_named'
      66 | module_param_named(modeset, bochs_modeset, int, 0444);
         | ^~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/tiny/bochs.c: At top level:
   drivers/gpu/drm/tiny/bochs.c:66:29: error: 'bochs_modeset' undeclared here (not in a function)
      66 | module_param_named(modeset, bochs_modeset, int, 0444);
         |                             ^~~~~~~~~~~~~
   include/linux/moduleparam.h:298:61: note: in definition of macro '__module_param_call'
     298 |             VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }
         |                                                             ^~~
   include/linux/moduleparam.h:156:9: note: in expansion of macro 'module_param_cb'
     156 |         module_param_cb(name, &param_ops_##type, &value, perm);            \
         |         ^~~~~~~~~~~~~~~
   drivers/gpu/drm/tiny/bochs.c:66:1: note: in expansion of macro 'module_param_named'
      66 | module_param_named(modeset, bochs_modeset, int, 0444);
         | ^~~~~~~~~~~~~~~~~~
   In file included from include/linux/device.h:32,
                    from include/linux/pci.h:37,
                    from drivers/gpu/drm/tiny/bochs.c:6:
   drivers/gpu/drm/tiny/bochs.c: In function 'bochs_pci_driver_init':

quoted

include/linux/device/driver.h:261:1: warning: control reaches end of non-void function [-Wreturn-type]

     261 | } \
         | ^
   include/drm/drm_module.h:93:9: note: in expansion of macro 'module_driver'
      93 |         module_driver(__pci_drv, drm_pci_register_driver_if_modeset, \
         |         ^~~~~~~~~~~~~
   drivers/gpu/drm/tiny/bochs.c:835:1: note: in expansion of macro 'drm_module_pci_driver_if_modeset'
     835 | drm_module_pci_driver_if_modeset(bochs_pci_driver, bochs_modeset);
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +261 include/linux/device/driver.h

4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  242  
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  243  /**
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  244   * module_driver() - Helper macro for drivers that don't do anything
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  245   * special in module init/exit. This eliminates a lot of boilerplate.
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  246   * Each module may only use this macro once, and calling it replaces
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  247   * module_init() and module_exit().
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  248   *
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  249   * @__driver: driver name
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  250   * @__register: register function for this driver type
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  251   * @__unregister: unregister function for this driver type
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  252   * @...: Additional arguments to be passed to __register and __unregister.
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  253   *
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  254   * Use this macro to construct bus specific macros for registering
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  255   * drivers, and do not use it on its own.
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  256   */
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  257  #define module_driver(__driver, __register, __unregister, ...) \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  258  static int __init __driver##_init(void) \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  259  { \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  260  	return __register(&(__driver) , ##__VA_ARGS__); \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09 @261  } \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  262  module_init(__driver##_init); \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  263  static void __exit __driver##_exit(void) \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  264  { \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  265  	__unregister(&(__driver) , ##__VA_ARGS__); \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  266  } \
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  267  module_exit(__driver##_exit);
4c002c978b7f2f Greg Kroah-Hartman 2019-12-09  268  

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