Jens, any comments?

On Tue, Sep 04, 2018 at 12:14:18PM -0700, Christoph Hellwig wrote:

Hi Jens,

this series moves various helpers related to merging based on physical
addresses from the public headers into block/, moves the Xen special
case from arch hooks into common code, cleans up the code a bit, and
removes not nessecary includes from the block headers.

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