[2.6.15-rc2-mm1] Disabled flatmem on ppc32? (ARCH=powerpc)

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There is a Kconfig problem for ppc32 in the latest -mm kernel. It seems that somehow the Kconfig logic for selecting memory models under ARCH=powerpc doesn't quite get it right for standard flatmem ppc32 systems. When I look at the memory model selection, I only see sparsemem, whereas on a normal -rc2 kernel, I can see both flatmem and sparsemem. This somehow triggers a #error where the number of reserved bits is less than the number necessary for the sparsemem layout (because we're on a 32-bit arch without the address space for sparsemem?).

Cheers,
Kyle Moffett

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