Regression: bug #81431 (v3.15..V3.16) pci=realloc fails to modify bridge windows, causing devices to fail BAR allocation

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I've finally had the opportunity to bisect this regession down to:

 PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources

commit 5b28541552ef5eeffc41d6936105f38c2508e566
Author: Yinghai Lu <yinghai@xxxxxxxxxx>
Date:   Mon May 19 17:01:55 2014 -0600

The patch is quite involved so could someone with familiarity with the allocation strategies take a look please?

https://bugzilla.kernel.org/show_bug.cgi?id=81431
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