ioremap.

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Eheu all, 

 Man page for ioremap says
 "The returned address is not guaranteed to be usable directly
 as a virtual address. "
(source can be found at:
 http://lxr.linux.no/source/include/asm-i386/io.h?v=2.4.26#L108  )
 
 what does that mean? How can I know if I can use that address can be
 usable or not? If i can't use directly that addrewss as a virtual
 address, how can I get a suitable one? And finally, 
 what was linus  thinking when wrote that code?

Uale,
Riba
 





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