Function to manually trigger a revert of all buffers presently visiting a file

gistfile1.el

(defun revert-all-buffers ()
  "Reverts all buffers that are visiting a file."
  (interactive)
  (mapcar
   (lambda (buf)
     (with-current-buffer buf
       (when (buffer-file-name)
         (revert-buffer t t t))))
   (buffer-list)))