On Tue, May 18, 2021 at 08:46:44AM +0200, Thomas Hellström wrote: > And worse, if we prefault a user-space buffer object map using > remap_io_sg() and then zap some ptes using madvise(), the next time those > ptes are accessed, we'd trigger a new call to remap_io_sg() which would now > find already populated ptes. While the old code looks to just silently > overwrite those, it looks like the new code would BUG in remap_pte_range()? How can you zap the PTEs using madvise?
