[trace:ftrace/urgent 7/11] fs/tracefs/inode.c:393:6: error: implicit declaration of function 'security_locked_down'; did you mean 'get_locked_pte'?

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

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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@intel.com>

All errors (new ones prefixed by >>):

   fs/tracefs/inode.c: In function 'tracefs_create_file':
>> fs/tracefs/inode.c:393:6: error: implicit declaration of function 'security_locked_down'; did you mean 'get_locked_pte'? [-Werror=implicit-function-declaration]
     if (security_locked_down(LOCKDOWN_TRACEFS))
         ^~~~~~~~~~~~~~~~~~~~
         get_locked_pte
>> fs/tracefs/inode.c:393:27: error: 'LOCKDOWN_TRACEFS' undeclared (first use in this function)
     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	
 > 393		if (security_locked_down(LOCKDOWN_TRACEFS))
   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	

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