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SubjectRe: mapping devices
   Date: Wed, 24 Apr 1996 19:46:53 +0959
From: Andrew Tridgell <tridge@cs.anu.edu.au>

Surely there are other devices out there that are sensitive to
unexpected reads?

Oh yeah, I just checked out the way things _really_ work... hmmm,
maybe we need a vm flag called "VM_DEVICE" which can exist at the same
time as the VM_LOCKED flag and inform the mmap() code you mention not
to try to force the pages in because "they already are in".

I bet this nuance slows down the X server startup a bit.

Later,
David S. Miller
davem@caip.rutgers.edu


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