From: Alan Cox on
On Wed, 5 May 2010 00:33:41 +0200
Arnd Bergmann <arnd(a)arndb.de> wrote:

> atomic_write_lock never nests below BTM as far
> as I can tell, so this can eventually get
> reverted again unless it triggers bugs.

That appears correct to me as a working assumpion as well
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