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[PATCH] squash duplicate page_to_pfn and pfn_to_page

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We have architectures where the size of page_to_pfn and pfn_to_page are
significant enough to overall image size that they wish to push them out of
line.  However, in the process we have grown a second copy of the
implementation of each of these routines for each memory model.  Share the
implmentation exposing it either inline or out-of-line as required.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andy Whitcroft
2006-06-23 02:03:12 -07:00
committed by Linus Torvalds
parent 6811378e7d
commit 67de648211
2 changed files with 17 additions and 42 deletions
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32
mm/page_alloc.c
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@ -2879,42 +2879,14 @@ void *__init alloc_large_system_hash(const char *tablename,
}
#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
/*
* pfn <-> page translation. out-of-line version.
* (see asm-generic/memory_model.h)
*/
#if defined(CONFIG_FLATMEM)
struct page *pfn_to_page(unsigned long pfn)
{
return mem_map + (pfn - ARCH_PFN_OFFSET);
return __pfn_to_page(pfn);
}
unsigned long page_to_pfn(struct page *page)
{
return (page - mem_map) + ARCH_PFN_OFFSET;
return __page_to_pfn(page);
}
#elif defined(CONFIG_DISCONTIGMEM)
struct page *pfn_to_page(unsigned long pfn)
{
int nid = arch_pfn_to_nid(pfn);
return NODE_DATA(nid)->node_mem_map + arch_local_page_offset(pfn,nid);
}
unsigned long page_to_pfn(struct page *page)
{
struct pglist_data *pgdat = NODE_DATA(page_to_nid(page));
return (page - pgdat->node_mem_map) + pgdat->node_start_pfn;
}
#elif defined(CONFIG_SPARSEMEM)
struct page *pfn_to_page(unsigned long pfn)
{
return __section_mem_map_addr(__pfn_to_section(pfn)) + pfn;
}
unsigned long page_to_pfn(struct page *page)
{
long section_id = page_to_section(page);
return page - __section_mem_map_addr(__nr_to_section(section_id));
}
#endif /* CONFIG_FLATMEM/DISCONTIGMME/SPARSEMEM */
EXPORT_SYMBOL(pfn_to_page);
EXPORT_SYMBOL(page_to_pfn);
#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */