[PATCH v3 0/7] kernel: Add support for restart notifier call chain

[Andrew Morton]

On Thu, 10 Jul 2014 17:15:49 -0700 Guenter Roeck <linux at roeck-us.net> wrote:

> Error on my part - I thought lower numbers would
> have higher priority, but after looking into the code again that
> is wrong.

You shouldn't have needed to look into the code :( Maybe a
documentation patch for notifier_block.priority for the next person?

> To avoid making things too complicated, maybe it would make sense to
> specify guidelines for notifier priorities, such as
> 0   - restart notifier of last resort, with least reset capabilities
> 128 - default; use if no other notifier is expected to be available
>        and/or if restart functionality is acceptable
> 255 - highest priority notifier which _must_ be used
> 
> Would that make sense and be acceptable ? In this context, I would then
> set the notifier priorities for the callers in the patch set to 128.

Yep, that sounds nice.  It's unlikely to see a lot of use, but at least
we showed we thought about it ;)