linux-kernel - [hare-scsi-devel:ata-trace.v4 16/68] drivers/ata/sata_mv.c:1276:30: warning: 'dw' is used uninitialized

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Message-ID: <202112102158.vl74bmsi-lkp@intel.com>
Date:   Fri, 10 Dec 2021 21:17:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Hannes Reinecke <hare@...e.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [hare-scsi-devel:ata-trace.v4 16/68] drivers/ata/sata_mv.c:1276:30:
 warning: 'dw' is used uninitialized

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git ata-trace.v4
head:   543d0f43ed9c7b04ab463b52f2e59fd406b4bde8
commit: f3e85aba1ba67f2efcc34413ed9546be69229179 [16/68] sata_mv: replace DPRINTK with dynamic debugging
config: m68k-randconfig-r006-20211210 (https://download.01.org/0day-ci/archive/20211210/202112102158.vl74bmsi-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git/commit/?id=f3e85aba1ba67f2efcc34413ed9546be69229179
        git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git
        git fetch --no-tags hare-scsi-devel ata-trace.v4
        git checkout f3e85aba1ba67f2efcc34413ed9546be69229179
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/ata/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/ata/sata_mv.c:790:35: warning: 'mv_pci_tbl' defined but not used [-Wunused-const-variable=]
     790 | static const struct pci_device_id mv_pci_tbl[] = {
         |                                   ^~~~~~~~~~
   drivers/ata/sata_mv.c: In function 'mv_pci_error':
>> drivers/ata/sata_mv.c:1276:30: warning: 'dw' is used uninitialized [-Wuninitialized]
    1276 |                         o += snprintf(linebuf + o, 38 - o,
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1277 |                                       "%08x ", dw);
         |                                       ~~~~~~~~~~~~
   drivers/ata/sata_mv.c:1270:13: note: 'dw' was declared here
    1270 |         u32 dw;
         |             ^~


vim +/dw +1276 drivers/ata/sata_mv.c

  1266	
  1267	static void mv_dump_pci_cfg(struct pci_dev *pdev, unsigned bytes)
  1268	{
  1269		int b, w, o;
  1270		u32 dw;
  1271		unsigned char linebuf[38];
  1272	
  1273		for (b = 0; b < bytes; ) {
  1274			for (w = 0, o = 0; b < bytes && w < 4; w++) {
  1275				(void) pci_read_config_dword(pdev, b, &dw);
> 1276				o += snprintf(linebuf + o, 38 - o,
  1277					      "%08x ", dw);
  1278				b += sizeof(u32);
  1279			}
  1280			dev_dbg(&pdev->dev, "%s: %02x: %s\n",
  1281				__func__, b, linebuf);
  1282		}
  1283	}
  1284	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org