From: Artem Bityutskiy on
Hi Linus,

would it be possible to add the following patch to your tree. I'm trying
to lessen amount of useless wake-ups in the kernel, and the 'sync_supers'
thread if one of those kernel threads which wakes up every 5 seconds to
(mostly) do nothing.

This is still work in progress, but putting the below patch to your tree
would make life easier at the next merge window. This patch just adds 3
accessor functions, but no one will use them so fare, so it must be
harmless. This was suggested by Ted and supported by Al:

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