Re: mlockall and mmap of IO devices don't mix
From: David S. Miller
Date: Sat Oct 04 2003 - 00:48:59 EST
On Fri, 3 Oct 2003 17:27:27 -0700
Andrew Morton <akpm@xxxxxxxx> wrote:
> Maybe it's best to not overload VM_RESERVED in this manner, but to always
> mark /dev/mem as VM_IO.
Just in cast is isn't clear, it should be defined that anything
that sets VM_IO on an mmap() area should prefill the page tables
as a side effect of such a mmap() request.
Then things like mlockall() have simple semantics on VM_IO area, they
end up being a nop.
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