Hello Hamish,

> I believe they have

> > Then that suggests they haven't been changed, at least if that old
> > kernel matches mine here.

Do a remount changing an option line barrier between 0 and 1 and back
again.  Each time observe whether mount and mountinfo reflect the latest
change and whether they tally.  This should give you confidence in what
to trust when observing your final desired settings.

> I'm reasonably sure they have applied, but I could be wrong. Is there
> another different way to check?

-- 
Cheers, Ralph.

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