Emacs + whitespace: ignoring 'normal' spaces

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http://unix.stackexchange.com – I would like to use whitespace to detect wrong whitespace (i.e. trailing whitespace on line, tabs instead of spaces etc.). However I would like to still have spaces displayed as spaces. I tried to use whitespace-space variable but I have not managed to do it. Is it possible? How to do it? (HowTos)