linux-kernel - Re: [PATCH 2/4] backlight: add max25014atg backlight

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <202507270543.G0TT6f25-lkp@intel.com>
Date: Sun, 27 Jul 2025 05:50:14 +0800
From: kernel test robot <lkp@...el.com>
To: Maud Spierings via B4 Relay <devnull+maudspierings.gocontroll.com@...nel.org>,
	Lee Jones <lee@...nel.org>, Daniel Thompson <danielt@...nel.org>,
	Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Helge Deller <deller@....de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	Maud Spierings <maudspierings@...ontroll.com>,
	MaudSpieringsmaudspierings@...ontroll.com
Subject: Re: [PATCH 2/4] backlight: add max25014atg backlight

Hi Maud,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d7af19298454ed155f5cf67201a70f5cf836c842]

url:    https://github.com/intel-lab-lkp/linux/commits/Maud-Spierings-via-B4-Relay/dt-bindings-backlight-Add-max25014-bindings/20250725-191221
base:   d7af19298454ed155f5cf67201a70f5cf836c842
patch link:    https://lore.kernel.org/r/20250725-max25014-v1-2-0e8cce92078e%40gocontroll.com
patch subject: [PATCH 2/4] backlight: add max25014atg backlight
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20250727/202507270543.G0TT6f25-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250727/202507270543.G0TT6f25-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507270543.G0TT6f25-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/video/backlight/max25014.c:86:4: warning: variable 'res' is uninitialized when used here [-Wuninitialized]
      86 |                         res |= 1 << i;
         |                         ^~~
   drivers/video/backlight/max25014.c:82:13: note: initialize the variable 'res' to silence this warning
      82 |         uint8_t res, i;
         |                    ^
         |                     = '\0'
   1 warning generated.


vim +/res +86 drivers/video/backlight/max25014.c

    73	
    74	/**
    75	 * @brief get the bit mask for the DISABLE register.
    76	 *
    77	 * @param strings the led string configuration array.
    78	 * @return uint8_t bits to set in the register.
    79	 */
    80	static uint8_t strings_mask(struct max25014 *maxim)
    81	{
    82		uint8_t res, i;
    83	
    84		for (i = 0; i < 4; i++) {
    85			if (maxim->pdata->strings[i] == 0)
  > 86				res |= 1 << i;
    87		}
    88		return res;
    89	}
    90	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki