Re: mlockall and mmap of IO devices don't mix

[Andi Kleen]

> It is not a trivial thing to do now we no longer have a single mem_map[].

2.4/DISCONTIGMEM also didn't have a single mem_map and it worked there
fine.

I implemented it for x86-64. Arguably it was a bit ugly, but not too bad.

-Andi
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