linux-kernel - [ogabbay:accel 1/2] drivers/accelerators/accel_sysfs.c:66:5: warning: no previous prototype for 'accel_sysfs

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Date:   Wed, 10 Aug 2022 20:56:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Oded Gabbay <ogabbay@...ana.ai>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [ogabbay:accel 1/2] drivers/accelerators/accel_sysfs.c:66:5:
 warning: no previous prototype for 'accel_sysfs_init'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git accel
head:   7cd6e545486f8ead2f046747a9557f62e8bbfff3
commit: ddc47a3f6a4387c32ae88c644a65529533f28d96 [1/2] accel: initial commit
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220810/202208102011.HntMqTCc-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git/commit/?id=ddc47a3f6a4387c32ae88c644a65529533f28d96
        git remote add ogabbay https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git
        git fetch --no-tags ogabbay accel
        git checkout ddc47a3f6a4387c32ae88c644a65529533f28d96
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/accelerators/

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

All warnings (new ones prefixed by >>):

>> drivers/accelerators/accel_sysfs.c:66:5: warning: no previous prototype for 'accel_sysfs_init' [-Wmissing-prototypes]
      66 | int accel_sysfs_init(void)
         |     ^~~~~~~~~~~~~~~~
>> drivers/accelerators/accel_sysfs.c:91:6: warning: no previous prototype for 'accel_sysfs_destroy' [-Wmissing-prototypes]
      91 | void accel_sysfs_destroy(void)
         |      ^~~~~~~~~~~~~~~~~~~
>> drivers/accelerators/accel_sysfs.c:105:16: warning: no previous prototype for 'accel_sysfs_minor_alloc' [-Wmissing-prototypes]
     105 | struct device *accel_sysfs_minor_alloc(struct accel_minor *minor)
         |                ^~~~~~~~~~~~~~~~~~~~~~~


vim +/accel_sysfs_init +66 drivers/accelerators/accel_sysfs.c

    55	
    56	/**
    57	 * accel_sysfs_init - initialize sysfs helpers
    58	 *
    59	 * This is used to create the ACCEL class, which is the implicit parent of any
    60	 * other top-level ACCEL sysfs objects.
    61	 *
    62	 * You must call accel_sysfs_destroy() to release the allocated resources.
    63	 *
    64	 * Return: 0 on success, negative error code on failure.
    65	 */
  > 66	int accel_sysfs_init(void)
    67	{
    68		int err;
    69	
    70		accel_class = class_create(THIS_MODULE, "accel");
    71		if (IS_ERR(accel_class))
    72			return PTR_ERR(accel_class);
    73	
    74		err = class_create_file(accel_class, &class_attr_version.attr);
    75		if (err) {
    76			class_destroy(accel_class);
    77			accel_class = NULL;
    78			return err;
    79		}
    80	
    81		accel_class->devnode = accel_devnode;
    82	
    83		return 0;
    84	}
    85	
    86	/**
    87	 * accel_sysfs_destroy - destroys ACCEL class
    88	 *
    89	 * Destroy the ACCEL device class.
    90	 */
  > 91	void accel_sysfs_destroy(void)
    92	{
    93		if (IS_ERR_OR_NULL(accel_class))
    94			return;
    95		class_remove_file(accel_class, &class_attr_version.attr);
    96		class_destroy(accel_class);
    97		accel_class = NULL;
    98	}
    99	
   100	static void accel_sysfs_release(struct device *dev)
   101	{
   102		kfree(dev);
   103	}
   104	
 > 105	struct device *accel_sysfs_minor_alloc(struct accel_minor *minor)
   106	{
   107		const char *minor_str;
   108		struct device *kdev;
   109		int r;
   110	
   111		if (minor->type == ACCEL_MINOR_CONTROL)
   112			minor_str = "ac_ControlD%d";
   113		else
   114			minor_str = "ac%d";
   115	
   116		kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
   117		if (!kdev)
   118			return ERR_PTR(-ENOMEM);
   119	
   120		device_initialize(kdev);
   121		kdev->devt = MKDEV(ACCEL_MAJOR, minor->index);
   122		kdev->class = accel_class;
   123		kdev->type = &accel_sysfs_device_minor;
   124		kdev->parent = minor->dev->dev;
   125		kdev->release = accel_sysfs_release;
   126		dev_set_drvdata(kdev, minor);
   127	
   128		r = dev_set_name(kdev, minor_str, minor->index);
   129		if (r < 0)
   130			goto err_free;
   131	
   132		return kdev;
   133	
   134	err_free:
   135		put_device(kdev);
   136		return ERR_PTR(r);
   137	}
   138	

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