[morse:mpam/snapshot/v6.2 136/139] fs/debugfs/file.c:959:9: warning: no previous prototype for 'debugfs_read_file_cpumask'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v6.2
head:   b04a157f0da06d80607a04ca0c1f58b610ba4a44
commit: eca824efb549effb3884515952c8587ee46cc8fb [136/139] debugfs: Add helpers for creating cpumask entries in debugfs
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230307/202303072202.jsd0sqAM-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
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/morse/linux.git/commit/?id=eca824efb549effb3884515952c8587ee46cc8fb
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/snapshot/v6.2
        git checkout eca824efb549effb3884515952c8587ee46cc8fb
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash fs/debugfs/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303072202.jsd0sqAM-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/debugfs/file.c:959:9: warning: no previous prototype for 'debugfs_read_file_cpumask' [-Wmissing-prototypes]
     959 | ssize_t debugfs_read_file_cpumask(struct file *file, char __user *user_buf,
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/debugfs_read_file_cpumask +959 fs/debugfs/file.c

   958	
 > 959	ssize_t debugfs_read_file_cpumask(struct file *file, char __user *user_buf,
   960					   size_t count, loff_t *ppos)
   961	{
   962		struct dentry *dentry = F_DENTRY(file);
   963		struct cpumask *cpumask;
   964		char *kernel_buf;
   965		ssize_t ret;
   966		int len;
   967	
   968		ret = debugfs_file_get(dentry);
   969		if (unlikely(ret))
   970			return ret;
   971	
   972		/* How long is a piece of string? */
   973		kernel_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
   974		if (!kernel_buf) {
   975			debugfs_file_put(dentry);
   976			return -ENOMEM;
   977		}
   978	
   979		cpumask = (struct cpumask *)file->private_data;
   980		len = scnprintf(kernel_buf, PAGE_SIZE,
   981				"%*pb\n", cpumask_pr_args(cpumask));
   982		debugfs_file_put(dentry);
   983		if (len + 1 >= PAGE_SIZE) {
   984			kfree(kernel_buf);
   985			return -EIO;
   986		}
   987	
   988		ret = simple_read_from_buffer(user_buf, count, ppos, kernel_buf, len);
   989		kfree(kernel_buf);
   990	
   991		return ret;
   992	}
   993	

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