2005-04-17 06:20:36 +08:00
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/*
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* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
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*
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*/
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#ifndef _ASM_MMZONE_H_
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#define _ASM_MMZONE_H_
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#include <asm/smp.h>
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#ifdef CONFIG_DISCONTIGMEM
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extern struct pglist_data *node_data[];
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#define NODE_DATA(nid) (node_data[nid])
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#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
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#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
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#define node_end_pfn(nid) \
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({ \
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pg_data_t *__pgdat = NODE_DATA(nid); \
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__pgdat->node_start_pfn + __pgdat->node_spanned_pages - 1; \
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})
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#define pfn_to_page(pfn) \
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({ \
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unsigned long __pfn = pfn; \
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int __node = pfn_to_nid(__pfn); \
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[PATCH] remove non-DISCONTIG use of pgdat->node_mem_map
This patch effectively eliminates direct use of pgdat->node_mem_map outside
of the DISCONTIG code. On a flat memory system, these fields aren't
currently used, neither are they on a sparsemem system.
There was also a node_mem_map(nid) macro on many architectures. Its use
along with the use of ->node_mem_map itself was not consistent. It has
been removed in favor of two new, more explicit, arch-independent macros:
pgdat_page_nr(pgdat, pagenr)
nid_page_nr(nid, pagenr)
I called them "pgdat" and "nid" because we overload the term "node" to mean
"NUMA node", "DISCONTIG node" or "pg_data_t" in very confusing ways. I
believe the newer names are much clearer.
These macros can be overridden in the sparsemem case with a theoretically
slower operation using node_start_pfn and pfn_to_page(), instead. We could
make this the only behavior if people want, but I don't want to change too
much at once. One thing at a time.
This patch removes more code than it adds.
Compile tested on alpha, alpha discontig, arm, arm-discontig, i386, i386
generic, NUMAQ, Summit, ppc64, ppc64 discontig, and x86_64. Full list
here: http://sr71.net/patches/2.6.12/2.6.12-rc1-mhp2/configs/
Boot tested on NUMAQ, x86 SMP and ppc64 power4/5 LPARs.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin J. Bligh <mbligh@aracnet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 15:07:37 +08:00
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&NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)]; \
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2005-04-17 06:20:36 +08:00
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})
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#define page_to_pfn(pg) \
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({ \
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struct page *__page = pg; \
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struct zone *__zone = page_zone(__page); \
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(unsigned long)(__page - __zone->zone_mem_map) \
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+ __zone->zone_start_pfn; \
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})
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#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
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/*
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* pfn_valid should be made as fast as possible, and the current definition
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* is valid for machines that are NUMA, but still contiguous, which is what
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* is currently supported. A more generalised, but slower definition would
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* be something like this - mbligh:
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* ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
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*/
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#if 1 /* M32R_FIXME */
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#define pfn_valid(pfn) (1)
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#else
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#define pfn_valid(pfn) ((pfn) < num_physpages)
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#endif
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/*
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* generic node memory support, the following assumptions apply:
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*/
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static __inline__ int pfn_to_nid(unsigned long pfn)
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{
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int node;
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for (node = 0 ; node < MAX_NUMNODES ; node++)
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if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
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break;
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return node;
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}
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static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
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{
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return(NODE_DATA(pfn_to_nid(pfn)));
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}
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#endif /* CONFIG_DISCONTIGMEM */
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#endif /* _ASM_MMZONE_H_ */
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