Re: [PATCH RESEND 1/2] drm: panel-orientation-quirks: Get rid of superfluous (void *) casting

[Jani Nikula <jani.nikula@linux.intel.com>]

On Fri, 22 Feb 2019, kbuild test robot <lkp@intel.com> wrote:
> Hi David,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v5.0-rc4 next-20190221]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/David-Santamar-a-Rogado/drm-panel-orientation-quirks-Get-rid-of-superfluous-void-casting/20190222-044326
> config: i386-randconfig-x019-201907 (attached as .config)
> compiler: gcc-8 (Debian 8.2.0-20) 8.2.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386 
>
> All warnings (new ones prefixed by >>):
>
>>> drivers/gpu/drm/drm_panel_orientation_quirks.c:89:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &acer_s1003,

*facepalm*

I overlooked that .driver_data is void *, not const void *. IMO it's
ugly to use (void *) to cast the const away, but it is what it is and
not doing so will lead to these warnings.

So I'm really sorry I'm going to have to ask you to revert back to just
patch 2/2 without this. My mistake.

BR,
Jani.


>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:95:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &asus_t100ha,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:108:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &gpd_pocket,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:116:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &gpd_win,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:124:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &gpd_win2,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:132:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &itworks_tw891,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:143:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &lcd800x1280_rightside_up,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:150:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &lcd800x1280_rightside_up,
>                      ^
>    drivers/gpu/drm/drm_panel_orientation_quirks.c:156:18: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
>       .driver_data = &lcd800x1280_rightside_up,
>                      ^
>
> vim +/const +89 drivers/gpu/drm/drm_panel_orientation_quirks.c
>
>     82	
>     83	static const struct dmi_system_id orientation_data[] = {
>     84		{	/* Acer One 10 (S1003) */
>     85			.matches = {
>     86			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Acer"),
>     87			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "One S1003"),
>     88			},
>   > 89			.driver_data = &acer_s1003,
>     90		}, {	/* Asus T100HA */
>     91			.matches = {
>     92			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
>     93			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100HAN"),
>     94			},
>     95			.driver_data = &asus_t100ha,
>     96		}, {	/*
>     97			 * GPD Pocket, note that the the DMI data is less generic then
>     98			 * it seems, devices with a board-vendor of "AMI Corporation"
>     99			 * are quite rare, as are devices which have both board- *and*
>    100			 * product-id set to "Default String"
>    101			 */
>    102			.matches = {
>    103			  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
>    104			  DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
>    105			  DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
>    106			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
>    107			},
>    108			.driver_data = &gpd_pocket,
>    109		}, {	/* GPD Win (same note on DMI match as GPD Pocket) */
>    110			.matches = {
>    111			  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
>    112			  DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
>    113			  DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
>    114			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
>    115			},
>    116			.driver_data = &gpd_win,
>    117		}, {	/* GPD Win 2 (too generic strings, also match on bios date) */
>    118			.matches = {
>    119			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Default string"),
>    120			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
>    121			  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Default string"),
>    122			  DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
>    123			},
>    124			.driver_data = &gpd_win2,
>    125		}, {	/* I.T.Works TW891 */
>    126			.matches = {
>    127			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "To be filled by O.E.M."),
>    128			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "TW891"),
>    129			  DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
>    130			  DMI_EXACT_MATCH(DMI_BOARD_NAME, "TW891"),
>    131			},
>    132			.driver_data = &itworks_tw891,
>    133		}, {	/*
>    134			 * Lenovo Ideapad Miix 310 laptop, only some production batches
>    135			 * have a portrait screen, the resolution checks makes the quirk
>    136			 * apply only to those batches.
>    137			 */
>    138			.matches = {
>    139			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
>    140			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80SG"),
>    141			  DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10ICR"),
>    142			},
>    143			.driver_data = &lcd800x1280_rightside_up,
>    144		}, {	/* Lenovo Ideapad Miix 320 */
>    145			.matches = {
>    146			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
>    147			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"),
>    148			  DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
>    149			},
>    150			.driver_data = &lcd800x1280_rightside_up,
>    151		}, {	/* VIOS LTH17 */
>    152			.matches = {
>    153			  DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VIOS"),
>    154			  DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "LTH17"),
>    155			},
>    156			.driver_data = &lcd800x1280_rightside_up,
>    157		},
>    158		{}
>    159	};
>    160	
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

-- 
Jani Nikula, Intel Open Source Graphics Center
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