On Fri, Apr 17, 2020 at 01:43:12PM +0200, Michal Hocko wrote: > On Fri 17-04-20 18:31:54, qiwuchen55@xxxxxxxxx wrote: > > From: chenqiwu <chenqiwu@xxxxxxxxxx> > > > > If we get a special mapping page like device mapping page or zero page > > when copy_one_pte, it's necessary add the page refcount count. > > From the changelog it is not clear what is the actual problem and how > the patch address it. Please be more verbose. > I don't find any actual problem, but I think there should be addressed to update the page refcount for special mappings include devmap and zero page instead of doing nothing else, since we copy the pte from one task to the other.
