Regression: Kernel unbootable since commit 4d6b4e6 - found by bisection

[Larry Finger]

Since early in the 4.3-rcx series, my Dell Latitude D600 with a 32-bit kernel 
fails to boot. Unfortunately, I did not discover this until late in the 4.4-rcX 
cycle. The symptom is that the kernel echos the "Loading initial ramdisk ..." 
message and then hangs.

The problem was bisected to commit 4d6b4es" x86/PCI/ACPI: Use common interface 
to support PCI host bridge" from Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>.  The 
bisection was tested by reverting the commit in question. I have not yet tried 
to analyze the patch to see where it might be going wrong.

Please suggest any trial prints to debug this issue.

Thanks,

Larry
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