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[PATCH] unify pfn_to_page: generic functions

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There are 3 memory models, FLATMEM, DISCONTIGMEM, SPARSEMEM.
Each arch has its own page_to_pfn(), pfn_to_page() for each models.
But most of them can use the same arithmetic.

This patch adds asm-generic/memory_model.h, which includes generic
page_to_pfn(), pfn_to_page() definitions for each memory model.

When CONFIG_OUT_OF_LINE_PFN_TO_PAGE=y, out-of-line functions are
used instead of macro. This is enabled by some archs and  reduces
text size.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2006-03-27 01:15:25 -08:00 • committed by Linus Torvalds
parent b06be912a3
commit a117e66ed4
4 changed files with 121 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

42
mm/page_alloc.c
View file

@ -2745,3 +2745,45 @@ void *__init alloc_large_system_hash(const char *tablename,
return table;
}
#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);
}
unsigned long page_to_pfn(struct page *page)
{
return (page - mem_map) + ARCH_PFN_OFFSET;
}
#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 zone *zone = page_zone(page);
return (page - zone->zone_mem_map) + zone->zone_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 */