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This replaces the manual read/write routines in debugfs with the common simple attribute helpers. Doing this gets rid of repeated copy/pasting of copy_from_user and value formatting code. Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> [danvet: Squash in follow-up fix from Kees Cook to fix u64 divides on 32bit platforms.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>