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/* K8 NUMA support */
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/* Copyright 2002,2003 by Andi Kleen, SuSE Labs */
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/* 2.5 Version loosely based on the NUMAQ Code by Pat Gaughen. */
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#ifndef _ASM_X86_64_MMZONE_H
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#define _ASM_X86_64_MMZONE_H 1
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#include <linux/config.h>
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#ifdef CONFIG_NUMA
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#define VIRTUAL_BUG_ON(x)
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#include <asm/smp.h>
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#define NODEMAPSIZE 0xff
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/* Simple perfect hash to map physical addresses to node numbers */
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extern int memnode_shift;
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extern u8 memnodemap[NODEMAPSIZE];
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extern int maxnode;
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extern struct pglist_data *node_data[];
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static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
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{
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int nid;
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VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
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nid = memnodemap[addr >> memnode_shift];
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VIRTUAL_BUG_ON(nid > maxnode);
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return nid;
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}
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#define NODE_DATA(nid) (node_data[nid])
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#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
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#define node_end_pfn(nid) (NODE_DATA(nid)->node_start_pfn + \
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NODE_DATA(nid)->node_spanned_pages)
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#ifdef CONFIG_DISCONTIGMEM
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#define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
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#define kvaddr_to_nid(kaddr) phys_to_nid(__pa(kaddr))
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/* AK: this currently doesn't deal with invalid addresses. We'll see
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if the 2.5 kernel doesn't pass them
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(2.4 used to). */
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#define pfn_to_page(pfn) ({ \
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int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT); \
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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>
20 years ago
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((pfn) - node_start_pfn(nid)) + NODE_DATA(nid)->node_mem_map; \
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})
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#define page_to_pfn(page) \
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(long)(((page) - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)
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#define pfn_valid(pfn) ((pfn) >= num_physpages ? 0 : \
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({ u8 nid__ = pfn_to_nid(pfn); \
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nid__ != 0xff && (pfn) >= node_start_pfn(nid__) && (pfn) <= node_end_pfn(nid__); }))
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#endif
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#define local_mapnr(kvaddr) \
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( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) )
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#endif
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#endif
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