tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/urgent head: ba6c8462bab44ff40793f21b7f3e61facd523a8a commit: 8f745a625b82040ca1f13643aaba2f19913b0a0b [7/11] tracing: Do not create tracefs files if tracefs lockdown is in effect config: i386-randconfig-b001-201940 (attached as .config) compiler: gcc-7 (Debian 7.4.0-13) 7.4.0 reproduce: git checkout 8f745a625b82040ca1f13643aaba2f19913b0a0b # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): fs/tracefs/inode.c: In function 'tracefs_create_file': if (security_locked_down(LOCKDOWN_TRACEFS)) ^~~~~~~~~~~~~~~~~~~~ get_locked_pte if (security_locked_down(LOCKDOWN_TRACEFS)) ^~~~~~~~~~~~~~~~ fs/tracefs/inode.c:393:27: note: each undeclared identifier is reported only once for each function it appears in cc1: some warnings being treated as errors vim +393 fs/tracefs/inode.c 359 360 /** 361 * tracefs_create_file - create a file in the tracefs filesystem 362 * @name: a pointer to a string containing the name of the file to create. 363 * @mode: the permission that the file should have. 364 * @parent: a pointer to the parent dentry for this file. This should be a 365 * directory dentry if set. If this parameter is NULL, then the 366 * file will be created in the root of the tracefs filesystem. 367 * @data: a pointer to something that the caller will want to get to later 368 * on. The inode.i_private pointer will point to this value on 369 * the open() call. 370 * @fops: a pointer to a struct file_operations that should be used for 371 * this file. 372 * 373 * This is the basic "create a file" function for tracefs. It allows for a 374 * wide range of flexibility in creating a file, or a directory (if you want 375 * to create a directory, the tracefs_create_dir() function is 376 * recommended to be used instead.) 377 * 378 * This function will return a pointer to a dentry if it succeeds. This 379 * pointer must be passed to the tracefs_remove() function when the file is 380 * to be removed (no automatic cleanup happens if your module is unloaded, 381 * you are responsible here.) If an error occurs, %NULL will be returned. 382 * 383 * If tracefs is not enabled in the kernel, the value -%ENODEV will be 384 * returned. 385 */ 386 struct dentry *tracefs_create_file(const char *name, umode_t mode, 387 struct dentry *parent, void *data, 388 const struct file_operations *fops) 389 { 390 struct dentry *dentry; 391 struct inode *inode; 392 394 return NULL; 395 396 if (!(mode & S_IFMT)) 397 mode |= S_IFREG; 398 BUG_ON(!S_ISREG(mode)); 399 dentry = start_creating(name, parent); 400 401 if (IS_ERR(dentry)) 402 return NULL; 403 404 inode = tracefs_get_inode(dentry->d_sb); 405 if (unlikely(!inode)) 406 return failed_creating(dentry); 407 408 inode->i_mode = mode; 409 inode->i_fop = fops ? fops : &tracefs_file_operations; 410 inode->i_private = data; 411 d_instantiate(dentry, inode); 412 fsnotify_create(dentry->d_parent->d_inode, dentry); 413 return end_creating(dentry); 414 } 415 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation