Re: [PATCH v1] mm: Fix access of uninitialized memmaps in fs/proc/page.c

[Michal Hocko]

On Wed 09-10-19 15:24:05, David Hildenbrand wrote:
> On 09.10.19 15:22, Michal Hocko wrote:
> > On Wed 09-10-19 14:58:24, David Hildenbrand wrote:
> > [...]
> >> I would be fine with this, but it means that - for now - the three
> >> /proc/ files won't be able to deal with ZONE_DEVICE memory.
> > 
> > Thanks for the clarification. Is this an actual problem though? Do we
> > have any consumers of the functionality?
> > 
> 
> I don't know, that's why I was being careful in not changing its behavior.

Can we simply go with pfn_to_online_page. I would be quite surprised if
anybody was really examining zone device memory ranges as they are
static IIUC. If there is some usecase I am pretty sure we will learn
that and can address it accordingly.
-- 
Michal Hocko
SUSE Labs