linux-kernel - Re: Should mmap MAP_LOCKED fail if mm

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Message-ID: <CA+55aFyajquhGhw59qNWKGK4dBV0TPmDD7-1XqPo7DZWvO_hPg@mail.gmail.com>
Date:	Tue, 28 Apr 2015 11:38:35 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm <linux-mm@...ck.org>, Cyril Hrubis <chrubis@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: Should mmap MAP_LOCKED fail if mm_poppulate fails?

On Tue, Apr 28, 2015 at 11:35 AM, Michal Hocko <mhocko@...e.cz> 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
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