From mboxrd@z Thu Jan  1 00:00:00 1970
From: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Subject: Re: Should mmap MAP_LOCKED fail if mm_poppulate fails?
Date: Tue, 28 Apr 2015 11:38:35 -0700
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To: Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>
Cc: linux-mm <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>, Cyril Hrubis <chrubis-AlSwsSmVLrQ@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Michel Lespinasse <walken-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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On Tue, Apr 28, 2015 at 11:35 AM, Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org> wrote:
>
> I am still not sure I see the problem here.

Basically, I absolutely hate the notion of us doing something
unsynchronized, when I can see us undoing a mmap that another thread
is doing. It's wrong.

You also didn't react to all the *other* things that were wrong in
that patch-set. The games you play with !fatal_signal_pending() etc
are just crazy.

End result: I absolutely detest the whole thing. I told you what I
consider an acceptable solution instead, that is much simpler and
doesn't have any of the problems of your patchset.

                      Linus