d0ead15738
DISCONTIGMEM on x86-32 implements pfn -> nid mapping similarly to SPARSEMEM; however, it calls each mapping unit ELEMENT instead of SECTION. This patch renames it to SECTION so that PAGES_PER_SECTION is valid for both DISCONTIGMEM and SPARSEMEM. This will be used by the next patch to implement mapping granularity check. This patch is trivial constant rename. Signed-off-by: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/20110712074422.GA2872@htj.dyndns.org Cc: Hans Rosenfeld <hans.rosenfeld@amd.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
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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_X86_MMZONE_32_H
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#define _ASM_X86_MMZONE_32_H
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#include <asm/smp.h>
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#ifdef CONFIG_NUMA
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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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#include <asm/numaq.h>
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extern void resume_map_numa_kva(pgd_t *pgd);
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#else /* !CONFIG_NUMA */
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static inline void resume_map_numa_kva(pgd_t *pgd) {}
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#endif /* CONFIG_NUMA */
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* generic node memory support, the following assumptions apply:
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*
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* 1) memory comes in 64Mb contiguous chunks which are either present or not
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* 2) we will not have more than 64Gb in total
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*
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* for now assume that 64Gb is max amount of RAM for whole system
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* 64Gb / 4096bytes/page = 16777216 pages
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*/
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#define MAX_NR_PAGES 16777216
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#define MAX_SECTIONS 1024
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#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
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extern s8 physnode_map[];
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static inline int pfn_to_nid(unsigned long pfn)
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{
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#ifdef CONFIG_NUMA
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return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
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#else
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return 0;
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#endif
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}
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static inline int pfn_valid(int pfn)
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{
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int nid = pfn_to_nid(pfn);
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if (nid >= 0)
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return (pfn < node_end_pfn(nid));
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return 0;
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}
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#define early_pfn_valid(pfn) pfn_valid((pfn))
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#endif /* CONFIG_DISCONTIGMEM */
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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/* always use node 0 for bootmem on this numa platform */
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#define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \
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(NODE_DATA(0)->bdata)
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#endif /* CONFIG_NEED_MULTIPLE_NODES */
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#endif /* _ASM_X86_MMZONE_32_H */
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