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Date:   Thu, 20 Oct 2016 21:26:47 +0200
From:   Michal Hocko <>
To:     Dave Hansen <>
Cc:     Lorenzo Stoakes <>,,
        Linus Torvalds <>,
        Jan Kara <>, Hugh Dickins <>,
        Rik van Riel <>,
        Mel Gorman <>,
        Andrew Morton <>,,,,,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH 00/10] mm: adjust get_user_pages* functions to explicitly
 pass FOLL_* flags

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

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