[PATCH] unify pfn_to_page take3 [0/23]

[KAMEZAWA Hiroyuki]

Hi, this is unify-pfn_to_page patch take3. thank you for comments on
previous version.

This patch consolidates definitions of pfn_to_page/page_to_pfn which are
defined by each arch to generic one. Most of archs can use it.
This patch is against 2.6.16-rc3 and totally rewritten.

Changelog v2 -> v3
 - linux/memory_model.h is moved to asm-generic/memory_model.h
 - If an arch can use generic funcs, it includes asm-generic/memory_model.h.
   If not, it doesn't include them. (m68k, m68knommu, ia64 + virtual_mem_map)
 - remvoed CONFIG_ARCH_PFN_TO_PAGE
 - CONFIG_DONT_INLINE_PFN_TO_PAGE was renamed to CONFIG_OUT_OF_LINE_PFN_TO_PAGE
   This is used by x86_64+DISCONTIGMEM and sparc64.

Changelog: v1->v2
 - linux/memory_model.h is added. this defines pfn<->page translation.
 - new config options (set by arch) CONFIG_DONT_INLINE_PFN_TO_PAGE
   and CONFIG_ARCH_HAS_PFN_TO_PAGE are added.
 - SPARSEMEM's page_to_pfn is moved to linux/memory_model.h

-- Kame.

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