x86, NUMA: Enable emulation on 32bit too

Now that NUMA init path is unified, NUMA emulation can be enabled on
32bit.  Make numa_emluation.c safe on 32bit by doing the followings.

* Define MAX_DMA32_PFN on 32bit too.

* Include bootmem.h for max_pfn declaration.

* Use u64 explicitly and always use PFN_PHYS() when converting page
  number to address.

* Avoid __udivdi3() generation on 32bit by doing number of pages
  calculation instead in split_nodes_interleave().

And drop X86_64 dependency from Kconfig.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 50cb68d2901d..648fca42ae6a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1201,7 +1201,7 @@ config NODES_SPAN_OTHER_NODES
 
 config NUMA_EMU
         bool "NUMA emulation"
-        depends on X86_64 && NUMA
+        depends on NUMA
         ---help---
           Enable NUMA emulation. A flat machine will be split
           into virtual nodes when booted with "numa=fake=N", where N is the