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On systems where there is MMIO space between different blocks of RAM in
the physical address space, __ioremap_caller did not allow mapping these
MMIO areas, because they were below the end RAM and thus considered RAM
as well. Use the memblock-based page_is_ram function, which returns
false for such MMIO holes.
v2:
Keep the check for p < virt_to_phys(high_memory). On 32-bit systems
with high memory (memory above physical address 4GiB), the high memory
is expected to be available though ioremap. The high_memory variable
marks the end of low memory; comparing against it means that only
ioremap requests for low RAM will be denied.
Reported by Michael Ellerman.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2bbf63264a