On Mon, Jul 29, 2019 at 07:30:44PM -0400, Jerome Glisse wrote: > On Mon, Jul 29, 2019 at 05:28:43PM +0300, Christoph Hellwig wrote: > > The MIGRATE_PFN_WRITE is only used locally in migrate_vma_collect_pmd, > > where it can be replaced with a simple boolean local variable. > > > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > > NAK that flag is useful, for instance a anonymous vma might have > some of its page read only even if the vma has write permission. > > It seems that the code in nouveau is wrong (probably lost that > in various rebase/rework) as this flag should be use to decide > wether to map the device memory with write permission or not. > > I am traveling right now, i will investigate what happened to > nouveau code. We can add it back when needed pretty easily. Much of this has bitrotted way to fast, and the pending ppc kvmhmm code doesn't need it either.
