I get the following new message in my dmesg:

[    0.155476] ACPI: bus type pci registered
[    0.155567] PCI: Found Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub with MMCONFIG support.
[    0.161149] PCI: Cannot map mmconfig aperture for segment 0
[    0.161181] PCI: Using configuration type 1
[    0.165980] ACPI: EC: Look up EC in DSDT

when previously i'd have:

[    0.156577] PCI: Found Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub with MMCONFIG support.
[    0.166403] PCI: Using MMCONFIG at e0000000 - efffffff
[    0.166407] PCI: Using configuration type 1
[    0.171548] ACPI: EC: Look up EC in DSDT


No idea if this is a regression or not, or what it means, the system works well.
git-bisect says the problem cames from:

commit c31c7d4844ea4817692ae16bf70f9c96c05a50eb
Author: Thomas Gleixner <tglx@linutronix.de>
Date:   Mon Feb 18 20:54:14 2008 +0100

    x86: CPA, fix alias checks
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