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Re: Unifying /dev/{mem,kmem,zero,null} implementations

On Feb 25, 2008, at 5:03 AM, Ignatios Souvatzis wrote:

On Sun, Feb 24, 2008 at 11:56:52PM +0000, Chris Gilbert wrote:

Perhaps I'm just being overly paranoid, and worried that something
somewhere will allow a memory access it shouldn't rather than causing a
trap or access fault.

I think the idea is to do several _remove() or _add calls and then
synchronize the hardware with the expected state just once, for expensive
MMU hardware accesses.

I think you should update as long as you have control of the
program flow - something like within the same system call, unless you
depend on the access control yourself.

PMAP experts may correct me of course.

Your interpretation is correct.

-- thorpej

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