global-whitespace-mode
global-whitespace-mode is an interactive autoloaded compiled Lisp function in `whitespace.el
'.
(global-whitespace-mode &optional ARG)
Toggle whitespace visualization globally (Global Whitespace mode).
With a prefix argument ARG, enable Global Whitespace mode if ARG
is positive, and disable it otherwise. If called from Lisp,
enable it if ARG is omitted or nil.
See also `whitespace-style', `whitespace-newline' and
`whitespace-display-mappings'.