Ability to force the physical location of a kmalloc for testing purposes

From: Kumar Gala
Date: Tue Jun 16 2009 - 17:48:21 EST

We are trying to test some IO DMA code and want to make sure the physical address is in a given range for testing. For example on PPC32 w/have 36-bit physical and some of IO devices are capable of DMAing to the full 36-bit address. However we want to test things like making sure a physical address >4G works properly.

- k
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