mm/mlock.c: document scary-looking stack expansion mlock chain
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. Signed-off-by:Johannes Weiner <hannes@cmpxchg.org> Reported-by:
Al Viro <viro@ZenIV.linux.org.uk> Cc: Hugh Dickins <hughd@google.com> Acked-by:
Michel Lespinasse <walken@google.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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e3790144
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