Messages in this thread | | | Date | Wed, 20 Feb 2013 22:24:02 +0800 | Subject | Re: [patch] mm: mlock: document scary-looking stack expansion mlock chain | From | Michel Lespinasse <> |
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On Fri, Feb 1, 2013 at 2:10 PM, Johannes Weiner <hannes@cmpxchg.org> wrote: > The fact that mlock calls get_user_pages, and get_user_pages might > call mlock when expanding a stack looks like a potential recursion. > > However, mlock makes sure the requested range is already contained > within a vma, so no stack expansion will actually happen from mlock. > > Should this ever change: the stack expansion mlocks only the newly > expanded range and so will not result in recursive expansion. > > Reported-by: Al Viro <viro@ZenIV.linux.org.uk> > Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michel Lespinasse <walken@google.com>
-- Michel "Walken" Lespinasse A program is never fully debugged until the last user dies.
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