consistent_alloc() revisited

[David Gibson]

On Sat, Jul 20, 2002 at 05:22:13PM +0200, Benjamin Herrenschmidt wrote:
>
> >
> >Arguably setting PageReserved is the Right Thing, since
> >consistent_alloc() memory obviously shouldn't be swapped or paged.
> >However, it's only relevant if the memory is mapped into userspace,
> >and then a driver can set VM_IO on the vma to prevent this.
>
> An other issue I had with AGP is, I think, killing the userspace
> process mmap'ing some of this memory will cause the kernel to try
> to free the pages if not PageReserved

Surely it shouldn't if VM_IO is set.

--
David Gibson			| For every complex problem there is a
david at gibson.dropbear.id.au	| solution which is simple, neat and
				| wrong.
http://www.ozlabs.org/people/dgibson

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