sound/usb/usx2y/us144mkii.c:27:12: warning: 'index' defined but not used

[kernel test robot <lkp@intel.com>]

Hi Šerif,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   37a93dd5c49b5fda807fd204edf2547c3493319c
commit: 0ec417aa85467c6fad0563621b74868be0faf00d ALSA: usb-audio: Add infrastructure for TASCAM US-144MKII
date:   6 months ago
config: loongarch-randconfig-r133-20260212 (https://download.01.org/0day-ci/archive/20260212/202602121917.O39hNVas-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260212/202602121917.O39hNVas-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602121917.O39hNVas-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/irqflags.h:19,
                    from include/linux/spinlock.h:59,
                    from include/linux/kfifo.h:40,
                    from sound/usb/usx2y/us144mkii.h:7,
                    from sound/usb/usx2y/us144mkii.c:7:
   arch/loongarch/include/asm/percpu.h:20:4: error: #error compiler support for the model attribute is necessary when a recent assembler is used
      20 | #  error compiler support for the model attribute is necessary when a recent assembler is used
         |    ^~~~~
>> sound/usb/usx2y/us144mkii.c:27:12: warning: 'index' defined but not used [-Wunused-variable]
      27 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
         |            ^~~~~


vim +/index +27 sound/usb/usx2y/us144mkii.c

dee1bcf28a3dd1 Šerif Rami 2025-08-14  12  
dee1bcf28a3dd1 Šerif Rami 2025-08-14  13  /**
dee1bcf28a3dd1 Šerif Rami 2025-08-14  14   * @brief Module parameters for ALSA card instantiation.
dee1bcf28a3dd1 Šerif Rami 2025-08-14  15   *
dee1bcf28a3dd1 Šerif Rami 2025-08-14  16   * These parameters allow users to configure how the ALSA sound card
dee1bcf28a3dd1 Šerif Rami 2025-08-14  17   * for the TASCAM US-144MKII is instantiated.
dee1bcf28a3dd1 Šerif Rami 2025-08-14  18   *
dee1bcf28a3dd1 Šerif Rami 2025-08-14  19   * @param index: Array of integers specifying the ALSA card index for each
dee1bcf28a3dd1 Šerif Rami 2025-08-14  20   * device. Defaults to -1 (automatic).
dee1bcf28a3dd1 Šerif Rami 2025-08-14  21   * @param id: Array of strings specifying the ALSA card ID for each device.
dee1bcf28a3dd1 Šerif Rami 2025-08-14  22   *            Defaults to "US144MKII".
dee1bcf28a3dd1 Šerif Rami 2025-08-14  23   * @param enable: Array of booleans to enable or disable each device.
dee1bcf28a3dd1 Šerif Rami 2025-08-14  24   *                Defaults to {1, 0, ..., 0} (first device enabled).
5c8c10796e274d Šerif Rami 2025-08-14  25   * @param dev_idx: Internal counter for the number of TASCAM devices probed.
dee1bcf28a3dd1 Šerif Rami 2025-08-14  26   */
dee1bcf28a3dd1 Šerif Rami 2025-08-14 @27  static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
dee1bcf28a3dd1 Šerif Rami 2025-08-14  28  static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
dee1bcf28a3dd1 Šerif Rami 2025-08-14  29  static bool enable[SNDRV_CARDS] = { 1, [1 ...(SNDRV_CARDS - 1)] = 0 };
dee1bcf28a3dd1 Šerif Rami 2025-08-14  30  static int dev_idx;
dee1bcf28a3dd1 Šerif Rami 2025-08-14  31  

:::::: The code at line 27 was first introduced by commit
:::::: dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 ALSA: usb-audio: Add initial driver for TASCAM US-144MKII

:::::: TO: Šerif Rami <ramiserifpersia@gmail.com>
:::::: CC: Takashi Iwai <tiwai@suse.de>

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