On Tue, Nov 22, 2022 at 08:29:05PM +0100, Daniel Vetter wrote: > You nuke all the ptes. Drivers that move have slightly more than a > bare struct file, they also have a struct address_space so that > invalidate_mapping_range() works. Okay, this is one of the ways that this can be made to work correctly, as long as you never allow GUP/GUP_fast to succeed on the PTEs. (this was the DAX mistake) Jason
