Andreas Kling abe3f515b1 Make font loading use mmap(). ...

This exposed a serious race condition in page_in_from_inode().
Reordered the logic and added a paging lock to VMObject.
Now, only one process can page in from a VMObject at a time.
There are definitely ways to optimize this, for instance by making
the locking be per-page instead. It's not something that I'm going
to worry about right now though.

2019-02-03 01:36:25 +01:00

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