# Re: \[PATCH 00/10\] mm: adjust get\_user\_pages\* functions to explicitly pass FOLL\_\* flags

- From: Michal Hocko \<mhocko@kernel.org\>
- Date: 2016-10-20 19:26:47 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2016/10/113064
- Thread: https://ratatoskr.run/linux-mm/2016/10/113072/t.md

```text
On Wed 19-10-16 10:23:55, Dave Hansen wrote:
> On 10/19/2016 10:01 AM, Michal Hocko wrote:
> > The question I had earlier was whether this has to be an explicit FOLL
> > flag used by g-u-p users or we can just use it internally when mm !> > current->mm
> 
> The reason I chose not to do that was that deferred work gets run under
> a basically random 'current'.  If we just use 'mm != current->mm', then
> the deferred work will sometimes have pkeys enforced and sometimes not,
> basically randomly.

OK, I see (async_pf_execute and ksm ). It makes more sense to me. Thanks
for the clarification.

-- 
Michal Hocko
SUSE Labs
```