Semphore -> mutex in the device tree

[Alan Stern]

Peter:

The obstacle to converting the semaphore in struct device to a mutex 
has been that its tree-oriented usage pattern isn't compatible with 
lockdep.

In order to get around this and at least begin the conversion process,
how about adding a provision for making some classes of mutex invisible
to lockdep?  I know it doesn't solve the fundamental problem, but maybe
it's a step in the right direction.

Alan Stern

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