linux-kernel - Re: [PATCH v7 1/2] mmc: core: Add infrastructure for undervoltage handling

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Message-ID: <202508141139.psCBtuQz-lkp@intel.com>
Date: Thu, 14 Aug 2025 11:49:54 +0800
From: kernel test robot <lkp@...el.com>
To: Oleksij Rempel <o.rempel@...gutronix.de>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Søren Andersen <san@...v.dk>,
	Christian Loehle <christian.loehle@....com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Avri Altman <Avri.Altman@...disk.com>
Subject: Re: [PATCH v7 1/2] mmc: core: Add infrastructure for undervoltage
 handling

Hi Oleksij,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on ulf-hansson-mmc-mirror/next v6.17-rc1 next-20250813]
[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/Oleksij-Rempel/mmc-core-add-undervoltage-handler-for-MMC-eMMC-devices/20250813-193625
base:   linus/master
patch link:    https://lore.kernel.org/r/20250813103309.3810728-2-o.rempel%40pengutronix.de
patch subject: [PATCH v7 1/2] mmc: core: Add infrastructure for undervoltage handling
config: x86_64-buildonly-randconfig-002-20250814 (https://download.01.org/0day-ci/archive/20250814/202508141139.psCBtuQz-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250814/202508141139.psCBtuQz-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/202508141139.psCBtuQz-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/mmc/core/core.c:1412:6: warning: unused variable 'ret' [-Wunused-variable]
    1412 |         int ret;
         |             ^~~
   1 warning generated.


vim +/ret +1412 drivers/mmc/core/core.c

  1400	
  1401	/**
  1402	 * mmc_handle_undervoltage - Handle an undervoltage event on the MMC bus
  1403	 * @host: The MMC host that detected the undervoltage condition
  1404	 *
  1405	 * This function is called when an undervoltage event is detected on one of
  1406	 * the MMC regulators.
  1407	 *
  1408	 * Returns: 0 on success or a negative error code on failure.
  1409	 */
  1410	int mmc_handle_undervoltage(struct mmc_host *host)
  1411	{
> 1412		int ret;
  1413	
  1414		/* Stop the host to prevent races with card removal */
  1415		__mmc_stop_host(host);
  1416	
  1417		if (!host->bus_ops || !host->bus_ops->handle_undervoltage)
  1418			return 0;
  1419	
  1420		dev_warn(mmc_dev(host), "%s: Undervoltage detected, initiating emergency stop\n",
  1421			 mmc_hostname(host));
  1422	
  1423		return host->bus_ops->handle_undervoltage(host);
  1424	}
  1425	

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