On Thu, Apr 01, 2021 at 12:27:52AM +1100, Alistair Popple wrote:

On Thursday, 1 April 2021 12:18:54 AM AEDT Jason Gunthorpe wrote:

quoted

On Wed, Mar 31, 2021 at 11:59:28PM +1100, Alistair Popple wrote:

quoted

I guess that makes sense as the split could go either way at the
moment but I should add a check to make sure this isn't used with
pinned pages anyway.

Is it possible to have a pinned page under one of these things? If I
pin it before you migrate it then it remains pinned but hidden under
the swap entry?

At the moment yes. But I had planned (and this reminded me) to add a check to 
prevent marking pinned pages for exclusive access. 

How do you even do that without races with GUP fast?

Jason