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Fri, 3 Jan 2025 00:38:27 +0000 Date: Fri, 3 Jan 2025 08:38:19 +0800 From: Philip Li To: kernel test robot CC: Jani Nikula , , , Hamza Mahfooz , "Javier Martinez Canillas" Subject: Re: drivers/gpu/drm/nouveau/nouveau_backlight.c:56:69: error: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 3 Message-ID: References: <202501022122.Pct9ERae-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <202501022122.Pct9ERae-lkp@intel.com> X-ClientProxiedBy: SG2PR04CA0164.apcprd04.prod.outlook.com (2603:1096:4::26) To DM4PR11MB5423.namprd11.prod.outlook.com (2603:10b6:5:39b::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB5423:EE_|CH0PR11MB5316:EE_ X-MS-Office365-Filtering-Correlation-Id: 77be8340-3c3b-4f48-e9e9-08dd2b8ef063 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|15866825006; 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Sorry, kindly ignore this report that the commit is not the initial cause of the issue. > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 56e6a3499e14716b9a28a307bb6d18c10e95301e > commit: f89632a9e5fa6c4787c14458cd42a9ef42025434 drm: Add CONFIG_DRM_WERROR > date: 10 months ago > config: loongarch-randconfig-002-20250102 (https://download.01.org/0day-ci/archive/20250102/202501022122.Pct9ERae-lkp@intel.com/config) > compiler: loongarch64-linux-gcc (GCC) 14.2.0 > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250102/202501022122.Pct9ERae-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 > | Closes: https://lore.kernel.org/oe-kbuild-all/202501022122.Pct9ERae-lkp@intel.com/ > > All errors (new ones prefixed by >>): > > drivers/gpu/drm/nouveau/nouveau_backlight.c: In function 'nouveau_backlight_init': > >> drivers/gpu/drm/nouveau/nouveau_backlight.c:56:69: error: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 3 [-Werror=format-truncation=] > 56 | snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); > | ^~ > In function 'nouveau_get_backlight_name', > inlined from 'nouveau_backlight_init' at drivers/gpu/drm/nouveau/nouveau_backlight.c:351:7: > drivers/gpu/drm/nouveau/nouveau_backlight.c:56:56: note: directive argument in the range [1, 2147483647] > 56 | snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); > | ^~~~~~~~~~~~~~~~ > drivers/gpu/drm/nouveau/nouveau_backlight.c:56:17: note: 'snprintf' output between 14 and 23 bytes into a destination of size 15 > 56 | snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > cc1: all warnings being treated as errors > > > vim +56 drivers/gpu/drm/nouveau/nouveau_backlight.c > > db1a0ae21461af Pierre Moreau 2016-12-08 46 > db1a0ae21461af Pierre Moreau 2016-12-08 47 static bool > 6d757753cef8d5 Lyude Paul 2018-09-06 48 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], > 6d757753cef8d5 Lyude Paul 2018-09-06 49 struct nouveau_backlight *bl) > db1a0ae21461af Pierre Moreau 2016-12-08 50 { > ab244be47a8f11 Christophe JAILLET 2022-02-09 51 const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL); > ab244be47a8f11 Christophe JAILLET 2022-02-09 52 > ab244be47a8f11 Christophe JAILLET 2022-02-09 53 if (nb < 0) > db1a0ae21461af Pierre Moreau 2016-12-08 54 return false; > db1a0ae21461af Pierre Moreau 2016-12-08 55 if (nb > 0) > db1a0ae21461af Pierre Moreau 2016-12-08 @56 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); > db1a0ae21461af Pierre Moreau 2016-12-08 57 else > db1a0ae21461af Pierre Moreau 2016-12-08 58 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight"); > 6d757753cef8d5 Lyude Paul 2018-09-06 59 bl->id = nb; > db1a0ae21461af Pierre Moreau 2016-12-08 60 return true; > db1a0ae21461af Pierre Moreau 2016-12-08 61 } > db1a0ae21461af Pierre Moreau 2016-12-08 62 > > :::::: The code at line 56 was first introduced by commit > :::::: db1a0ae21461afa4bc435651a6dd55e0e6ef4a8b drm/nouveau/bl: Assign different names to interfaces > > :::::: TO: Pierre Moreau > :::::: CC: Ben Skeggs > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki >