linux-kernel - Re: [PATCH] mm/mlock: fix BUG_ON unlocked page for nolinear VMAs

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Message-ID: <CA+55aFzCdGR+cNkvBiwmpgnOwFrVD+K9t4JJnFOL0FE-EtFMwQ@mail.gmail.com>
Date:	Wed, 8 Jan 2014 10:44:28 +0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Motohiro Kosaki <Motohiro.Kosaki@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Michel Lespinasse <walken@...gle.com>,
	Bob Liu <bob.liu@...cle.com>, Nick Piggin <npiggin@...e.de>,
	Motohiro Kosaki JP <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH] mm/mlock: fix BUG_ON unlocked page for nolinear VMAs

On Tue, Jan 7, 2014 at 11:01 PM, Vlastimil Babka <vbabka@...e.cz> wrote:
>
> So here's a patch that if accepted should replace the removal of BUG_ON patch in
> -mm tree: http://ozlabs.org/~akpm/mmots/broken-out/mm-remove-bug_on-from-mlock_vma_page.patch
>
> The idea is that try_to_unmap_cluster() will try locking the page
> for mlock, and just leave it alone if lock cannot be obtained. Again
> that's not fatal, as eventually something will encounter and mlock the page.

This looks sane to me. Andrew?

            Linus
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