Re: [PATCH 06/12] drm/client: Constify modes

[kernel test robot <lkp@intel.com>]

Hi Ville,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.9-rc2 next-20240405]
[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-client-Fully-protect-modes-with-dev-mode_config-mutex/20240405-043540
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240404203336.10454-7-ville.syrjala%40linux.intel.com
patch subject: [PATCH 06/12] drm/client: Constify modes
config: i386-randconfig-012-20240405 (https://download.01.org/0day-ci/archive/20240405/202404051422.BpYVK6TP-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240405/202404051422.BpYVK6TP-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404051422.BpYVK6TP-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_client_modeset.c:1241:0:
   drivers/gpu/drm/tests/drm_client_modeset_test.c: In function 'drm_test_pick_cmdline_res_1920_1080_60':
>> drivers/gpu/drm/tests/drm_client_modeset_test.c:108:7: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     mode = drm_connector_pick_cmdline_mode(connector);
          ^


vim +/const +108 drivers/gpu/drm/tests/drm_client_modeset_test.c

8fc0380f6ba7e9 Maxime Ripard 2022-11-14   84  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   85  static void drm_test_pick_cmdline_res_1920_1080_60(struct kunit *test)
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   86  {
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   87  	struct drm_client_modeset_test_priv *priv = test->priv;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   88  	struct drm_device *drm = priv->drm;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   89  	struct drm_connector *connector = &priv->connector;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   90  	struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   91  	struct drm_display_mode *expected_mode, *mode;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   92  	const char *cmdline = "1920x1080@60";
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   93  	int ret;
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   94  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   95  	expected_mode = drm_mode_find_dmt(priv->drm, 1920, 1080, 60, false);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   96  	KUNIT_ASSERT_NOT_NULL(test, expected_mode);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   97  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   98  	KUNIT_ASSERT_TRUE(test,
8fc0380f6ba7e9 Maxime Ripard 2022-11-14   99  			  drm_mode_parse_command_line_for_connector(cmdline,
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  100  								    connector,
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  101  								    cmdline_mode));
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  102  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  103  	mutex_lock(&drm->mode_config.mutex);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  104  	ret = drm_helper_probe_single_connector_modes(connector, 1920, 1080);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  105  	mutex_unlock(&drm->mode_config.mutex);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  106  	KUNIT_ASSERT_GT(test, ret, 0);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  107  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14 @108  	mode = drm_connector_pick_cmdline_mode(connector);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  109  	KUNIT_ASSERT_NOT_NULL(test, mode);
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  110  
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  111  	KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected_mode, mode));
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  112  }
8fc0380f6ba7e9 Maxime Ripard 2022-11-14  113  

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