Messages in this thread | | | Date | Tue, 11 Dec 2012 17:16:10 +0000 | From | Alan Cox <> | Subject | Re: [RFC v1 01/16] lib: devres: don't enclose pcim_*() functions in CONFIG_HAS_IOPORT |
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> Correct. If HAS_IOPORT is not selected then we are potentially missing > the dependent functions (because the platform has no IOPORT support) _or_ > it does have ISA/PCI IO spaces _but_ they're not mappable via the > ioport_map() mechanism due to some non-linearity involved in the > translation. > > To make that second point clear, that's platforms where: > > ioport_map(addr + 4) != ioport_map(addr) + 4.
For inb/inw and friends this shouldn't matter.
You can implement inl for example
as
if (unlikely(addr & 3)) // or in fact BUG on this for almost all h/w uninlined_hard_slow_inl(addr); else return *(u32 *)iospace_map[addr];
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