[tglx-devel:x86/topology 22/41] arch/x86/kernel/cpu/debugfs.c:53:35: warning: 'sprintf' may write a terminating nul past the end of the destination

[tglx-devel:x86/topology 22/41] arch/x86/kernel/cpu/debugfs.c:53:35: warning: 'sprintf' may write a terminating nul past the end of the destination

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/topology
head:   68e2a6fab985dc1ed5e9e7e2b0a8998ef2951772
commit: b8f285eb46639df7f680c92122aa65302f32e2cd [22/41] x86/cpu: Provide debug interface
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230919/202309192324.p3ySFahn-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/20230919/202309192324.p3ySFahn-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/202309192324.p3ySFahn-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/kernel/cpu/debugfs.c: In function 'cpu_init_debugfs':
>> arch/x86/kernel/cpu/debugfs.c:53:35: warning: 'sprintf' may write a terminating nul past the end of the destination [-Wformat-overflow=]
      53 |                 sprintf(name, "%lu", id);
         |                                   ^
   arch/x86/kernel/cpu/debugfs.c:53:17: note: 'sprintf' output between 2 and 11 bytes into a destination of size 10
      53 |                 sprintf(name, "%lu", id);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~


vim +/sprintf +53 arch/x86/kernel/cpu/debugfs.c

    44	
    45	static __init int cpu_init_debugfs(void)
    46	{
    47		struct dentry *dir, *base = debugfs_create_dir("topo", arch_debugfs_dir);
    48		unsigned long id;
    49		char name[10];
    50	
    51		dir = debugfs_create_dir("cpus", base);
    52		for_each_possible_cpu(id) {
  > 53			sprintf(name, "%lu", id);

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