Fair enough. Here's an updated patch that respects global-font-lock-mode.

On 8 October 2016 at 14:42, Dmitry Gutov <dgutov@yandex.ru> wrote:
> On 08.10.2016 21:39, Wilfred Hughes wrote:
>>
>> hexl-mode does not ensure font-lock is enabled, so the faces
>> hexl-address-region and hexl-ascii-region are not applied.
>
>
> Would a user who disabled global-font-lock-mode really want that?
>