On Thu, Jul 27, 2000 at 03:12:54PM +0200, Jamie Lokier wrote:
> David S. Miller wrote:
> > Derefencing the return pointer from ioremap() and not using the readw
> > etc. interfaces is almost guarenteed to not work on any platform
> > other than x86. On Sparc64 for example the return from ioremap()
> > happens to be a physical address and will OOPS on you on any direct
> > derefence of that pointer, readw() and friends do the access in the
> > correct manner.
>
> Has anyone considered offsetting the ioremap() return address and
> subtracting that offset in readl() et al., to catch bogus drivers that
> dereference directly?
>
> I'd guess most drivers are tested only on x86 -- this is one way to
> check that they're getting at least one portability issue right.
We do this on MIPS and it caught a significant number of driver bugs.
Ralf
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