Someone

(defun match-alist (str list)
    (while (and (not (string-match (car (car list)) str))
		(setq list (cdr list))))
    (cdr (car list)))

(c-add-style "linux"  '("k&r" (c-basic-offset . 8) (indent-tabs-mode . t)))
(c-add-style "notabs" '("k&r" (c-basic-offset . 4) (indent-tabs-mode . nil)))

(setq c-file-style-alist '(("/linux.*/"   . "linux")
			   ("/u-boot/"    . "linux")
			   ("/x-load/"    . "linux")
			   ("/x264/"      . "notabs")
			   ("/ffmpeg.*/"  . "notabs")
			   (""            . "notabs")))

(defun fixup-c-style ()
  (c-set-style (match-alist (or (buffer-file-name) "") c-file-style-alist)))