Paul Mackerras wrote:
Note that that check is also wrong for ppc64. I think it is going to
be wrong for most 64-bit platforms, since it is assuming that you can
never have ram at a higher physical address than any I/O devices. On
64-bit platforms it is quite common to have some ram and some I/O
below 4GB, and some more ram above 4GB.
I don't see why we need the check anyway, unless some architecture
(x86?) will actually panic if you try to ioremap a physical address
that is below virt_to_phys(high_memory) or something.
Wouldn't this check even break on x86 with PAE? Those boxes certainly
have parts of their ram mapped above io memory too. Or does that
high_memory variable stay below 4GB with PAE?
Roland
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