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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2006-03-27 04:15:25 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 11:44:44 -0500
commita117e66ed45ac0569c039ea60bd7a9a61e031858 (patch)
tree292367ab930f83c418c34d4c46f95717e5e6394e /mm
parentb06be912a3ad68c69dba0ed6e92723140020e392 (diff)
[PATCH] unify pfn_to_page: generic functions
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 338a02bb004d..349b328763b7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2745,3 +2745,45 @@ void *__init alloc_large_system_hash(const char *tablename,
2745 2745
2746 return table; 2746 return table;
2747} 2747}
2748
2749#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
2750/*
2751 * pfn <-> page translation. out-of-line version.
2752 * (see asm-generic/memory_model.h)
2753 */
2754#if defined(CONFIG_FLATMEM)
2755struct page *pfn_to_page(unsigned long pfn)
2756{
2757 return mem_map + (pfn - ARCH_PFN_OFFSET);
2758}
2759unsigned long page_to_pfn(struct page *page)
2760{
2761 return (page - mem_map) + ARCH_PFN_OFFSET;
2762}
2763#elif defined(CONFIG_DISCONTIGMEM)
2764struct page *pfn_to_page(unsigned long pfn)
2765{
2766 int nid = arch_pfn_to_nid(pfn);
2767 return NODE_DATA(nid)->node_mem_map + arch_local_page_offset(pfn,nid);
2768}
2769unsigned long page_to_pfn(struct page *page)
2770{
2771 struct zone *zone = page_zone(page);
2772 return (page - zone->zone_mem_map) + zone->zone_start_pfn;
2773
2774}
2775#elif defined(CONFIG_SPARSEMEM)
2776struct page *pfn_to_page(unsigned long pfn)
2777{
2778 return __section_mem_map_addr(__pfn_to_section(pfn)) + pfn;
2779}
2780
2781unsigned long page_to_pfn(struct page *page)
2782{
2783 long section_id = page_to_section(page);
2784 return page - __section_mem_map_addr(__nr_to_section(section_id));
2785}
2786#endif /* CONFIG_FLATMEM/DISCONTIGMME/SPARSEMEM */
2787EXPORT_SYMBOL(pfn_to_page);
2788EXPORT_SYMBOL(page_to_pfn);
2789#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */