Can't that fire when changing the max count from user space at just the
wrong time?
You are right: technically it's possible if it was raised between the
time of checking and when the new VMA is added.
I assume we'll have to tolerated that and might just want to drop this
patch from the series.
It is compiled out in !CONFIG_VM_DEBUG builds, would we still want to drop it?
Due to the racy nature I think any kinds of assertions would be wrong.
Without any such races possible I would agree that the checks would be
nice to have.
--
Cheers
David / dhildenb