when to switch from early_ioremap to ioremap

[Olaf Hering]

To obtain an address to a PFN in init_hypervisor_platform (called from
arch/x86/kernel/setup.c:setup_arch) I use early_ioremap. Later the
address to that PFN needs to be obtained with ioremap, and early_iounmap
needs to be called on the first address.

When is the time to obtain and use the new pointer, and to release to
old pointer? Right now I do that in the pci-device setup code, which
happens to work. Unfortunately early_ioremap is not mentioned in
Documentation/, hence the question.

Olaf
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