Re: mapping user space buffer to kernel address space

[Stephen Tweedie]

Hi,

On Tue, Oct 17, 2000 at 09:26:07PM -0700, Linus Torvalds wrote:

> I hated people mis-using it the way it's being done by the sound drivers,
> but because I also realize that it allows for some simplifications I do
> accept it - it's basically an ugly hack that doesn't really matter because
> the exact same code _is_ needed for the real IO mapping case anyway, and
> as far as the kernel is concerned the whole thing with PG_reserved is all
> just a game to make the kernel VM subsystem think that some real RAM is
> actually IO space and shouldn't be touched.

I've got kiobuf diffs which allow you to (a) map any kernel memory
(including vmalloced areas) into a kiobuf, and then (b) mmap any
kiobuf into user space using sane, faulting vmas (with the option of
prefaulting for performance if you want it).  Nobody is using it right
now so I wasn't planning on resending it to you until 2.5, but if you
want to give people a chance to start using it earlier I can send it
in.

--Stephen
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