On Thu, 2025-09-18 at 16:39 +0900, Hajime Tazaki wrote:
> The commit 8fe743b5eba0 ("PCI: Add CONFIG_MMU dependency") restricts the
> PCI base driver to depend on MMU. While nommu UML _can_ implement PCI
> drivers over PCI devices (e.g., virtio-pci), the current nommu UML
> doesn't implement it.
>
> But without PCI drivers kunit complains as config for kunit
> (arch_uml.config) defines the dependency to PCI drivers.
>
> This commit fixes the issue of this compile failures when building PCI
> drivers with nommu UML. In particular, the fix is to undefine the
> constant PCI_IOBASE to be able to bypass pci_unmap_iospace() call.
This doesn't make a lot of sense to me. Why would we even want to build
PCI on NOMMU-UML if PCI in general is dependent on MMU now?
It's not like ARCH=um with PCI and NOMMU has any value even for testing
if such a configuration cannot exist in reality?
johannes
