linux-kernel - drivers/iio/magnetometer/bmc150_magn_spi.c:48:36: warning: 'bmc150_magn_acpi

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Date:   Sat, 18 Nov 2023 12:43:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Daniel Baluta <daniel.baluta@...el.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jonathan Cameron <jic23@...nel.org>
Subject: drivers/iio/magnetometer/bmc150_magn_spi.c:48:36: warning:
 'bmc150_magn_acpi_match' defined but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   791c8ab095f71327899023223940dd52257a4173
commit: 534536acdb25bae85a5333b7085837b3f1f72b73 iio: magn: bmc150: Introduce SPI support
date:   8 years ago
config: x86_64-buildonly-randconfig-001-20231012 (https://download.01.org/0day-ci/archive/20231118/202311181254.T7DGa79n-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231118/202311181254.T7DGa79n-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/202311181254.T7DGa79n-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/kobject.h:21,
                    from include/linux/module.h:17,
                    from drivers/iio/magnetometer/bmc150_magn_spi.c:12:
   include/linux/sysfs.h: In function 'sysfs_get_dirent':
   include/linux/sysfs.h:517:44: warning: pointer targets in passing argument 2 of 'kernfs_find_and_get' differ in signedness [-Wpointer-sign]
     517 |         return kernfs_find_and_get(parent, name);
         |                                            ^~~~
         |                                            |
         |                                            const unsigned char *
   In file included from include/linux/sysfs.h:15:
   include/linux/kernfs.h:437:57: note: expected 'const char *' but argument is of type 'const unsigned char *'
     437 | kernfs_find_and_get(struct kernfs_node *kn, const char *name)
         |                                             ~~~~~~~~~~~~^~~~
   drivers/iio/magnetometer/bmc150_magn_spi.c: At top level:
   drivers/iio/magnetometer/bmc150_magn_spi.c:49:9: warning: missing initializer for field 'cls' of 'const struct acpi_device_id' [-Wmissing-field-initializers]
      49 |         {"BMC150B", 0},
         |         ^
   In file included from drivers/iio/magnetometer/bmc150_magn_spi.c:13:
   include/linux/mod_devicetable.h:192:15: note: 'cls' declared here
     192 |         __u32 cls;
         |               ^~~
   drivers/iio/magnetometer/bmc150_magn_spi.c:50:9: warning: missing initializer for field 'cls' of 'const struct acpi_device_id' [-Wmissing-field-initializers]
      50 |         {"BMC156B", 0},
         |         ^
   include/linux/mod_devicetable.h:192:15: note: 'cls' declared here
     192 |         __u32 cls;
         |               ^~~
>> drivers/iio/magnetometer/bmc150_magn_spi.c:48:36: warning: 'bmc150_magn_acpi_match' defined but not used [-Wunused-const-variable=]
      48 | static const struct acpi_device_id bmc150_magn_acpi_match[] = {
         |                                    ^~~~~~~~~~~~~~~~~~~~~~


vim +/bmc150_magn_acpi_match +48 drivers/iio/magnetometer/bmc150_magn_spi.c

    47	
  > 48	static const struct acpi_device_id bmc150_magn_acpi_match[] = {
    49		{"BMC150B", 0},
    50		{"BMC156B", 0},
    51		{},
    52	};
    53	MODULE_DEVICE_TABLE(acpi, bmc150_magn_acpi_match);
    54	

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https://github.com/intel/lkp-tests/wiki