Proposed changes to io.h

[John Whitney]

> We could add a runtime check to pci_map_single() to verify it gets
> passed an address within the linear mapping though. That would catch
> the bugs you are afraid of.

Might not be bad to add this as a conditional under one of the SANITY
type kernel hacking config options.

> (Oh, and let's keep those discussions on-list).
>

Sorry, Ben.  I'll shut up about it now, I promise. :-)

John


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