1dff7f3db5
pfn_to_page really requires pfn_valid to be true now, no question. Some people stumbled over it, but it was misleading and wrong. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* 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 0xfff
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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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/* Requires pfn_valid(pfn) to be true */
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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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((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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