[CVE-2014-3122][Lucid][Precise/lts-backport-quantal] mm: try_to_unmap_cluster() should lock_page() before mlocking

[Andy Whitcroft]

I see you say lts-quantal, acking for either/both depending if there
are any more quantals.

> Subject: Re: [CVE-2014-3122][Lucid][Precise/lts-backport-quantal] mm:
>  try_to_unmap_cluster() should lock_page() before mlocking

-apw