tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git debugfs_cleanup head: 8247270bcf99bc7bf661ae2a3f2ee6e64c7f957d commit: 8247270bcf99bc7bf661ae2a3f2ee6e64c7f957d [1/1] fs: make d_path-like functions all have unsigned size compiler: ia64-linux-gcc (GCC) 11.2.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; cppcheck possible warnings: (new ones prefixed by >>, may not real problems) if (likely(p->len >= 0)) ^ vim +20 fs/d_path.c 7a5cf791a74764 Al Viro 2018-03-05 10 ad08ae586586ea Al Viro 2021-05-12 11 struct prepend_buffer { ad08ae586586ea Al Viro 2021-05-12 12 char *buf; 8247270bcf99bc Greg Kroah-Hartman 2021-07-27 13 unsigned int len; ad08ae586586ea Al Viro 2021-05-12 14 }; ad08ae586586ea Al Viro 2021-05-12 15 #define DECLARE_BUFFER(__name, __buf, __len) \ ad08ae586586ea Al Viro 2021-05-12 16 struct prepend_buffer __name = {.buf = __buf + __len, .len = __len} ad08ae586586ea Al Viro 2021-05-12 17 ad08ae586586ea Al Viro 2021-05-12 18 static char *extract_string(struct prepend_buffer *p) 7a5cf791a74764 Al Viro 2018-03-05 19 { ad08ae586586ea Al Viro 2021-05-12 @20 if (likely(p->len >= 0)) ad08ae586586ea Al Viro 2021-05-12 21 return p->buf; ad08ae586586ea Al Viro 2021-05-12 22 return ERR_PTR(-ENAMETOOLONG); ad08ae586586ea Al Viro 2021-05-12 23 } ad08ae586586ea Al Viro 2021-05-12 24 :::::: The code at line 20 was first introduced by commit :::::: ad08ae586586ea9e2c0228a3d5a083500ea54202 d_path: introduce struct prepend_buffer :::::: TO: Al Viro <viro(a)zeniv.linux.org.uk&gt; :::::: CC: Al Viro <viro(a)zeniv.linux.org.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org