In commit 
9c0ece069b32 ("Get rid of Documentation/feature-removal.txt"),
Linus removed feature-removal-schedule.txt from Documentation, but there
is still some reference to this file.  So remove them.
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
        if (ret)
                goto out_unlock;
 
-       /* See feature-removal-schedule.txt */
        if (opts.subsys_mask != root->actual_subsys_mask || opts.release_agent)
                pr_warning("cgroup: option changes via remount are deprecated (pid=%d comm=%s)\n",
                           task_tgid_nr(current), current->comm);
 
                        printk(KERN_WARNING "Symbol %s is being used "
                               "by a non-GPL module, which will not "
                               "be allowed in the future\n", fsa->name);
-                       printk(KERN_WARNING "Please see the file "
-                              "Documentation/feature-removal-schedule.txt "
-                              "in the kernel source tree for more details.\n");
                }
        }