linux/arch/x86/include/asm/mmzone_32.h
Tejun Heo d0ead15738 x86, mm: s/PAGES_PER_ELEMENT/PAGES_PER_SECTION/
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>
2011-07-12 21:58:11 -07:00

71 lines
1.5 KiB
C

/*
* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
*
*/
#ifndef _ASM_X86_MMZONE_32_H
#define _ASM_X86_MMZONE_32_H
#include <asm/smp.h>
#ifdef CONFIG_NUMA
extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[nid])
#include <asm/numaq.h>
extern void resume_map_numa_kva(pgd_t *pgd);
#else /* !CONFIG_NUMA */
static inline void resume_map_numa_kva(pgd_t *pgd) {}
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DISCONTIGMEM
/*
* generic node memory support, the following assumptions apply:
*
* 1) memory comes in 64Mb contiguous chunks which are either present or not
* 2) we will not have more than 64Gb in total
*
* for now assume that 64Gb is max amount of RAM for whole system
* 64Gb / 4096bytes/page = 16777216 pages
*/
#define MAX_NR_PAGES 16777216
#define MAX_SECTIONS 1024
#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
extern s8 physnode_map[];
static inline int pfn_to_nid(unsigned long pfn)
{
#ifdef CONFIG_NUMA
return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
#else
return 0;
#endif
}
static inline int pfn_valid(int pfn)
{
int nid = pfn_to_nid(pfn);
if (nid >= 0)
return (pfn < node_end_pfn(nid));
return 0;
}
#define early_pfn_valid(pfn) pfn_valid((pfn))
#endif /* CONFIG_DISCONTIGMEM */
#ifdef CONFIG_NEED_MULTIPLE_NODES
/* always use node 0 for bootmem on this numa platform */
#define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \
(NODE_DATA(0)->bdata)
#endif /* CONFIG_NEED_MULTIPLE_NODES */
#endif /* _ASM_X86_MMZONE_32_H */