91ea820716
Make sure that we really return -1 (instead of 0x00ff) as node id for page frame numbers which are not physically available. This finally fixes the kernel panic when running cat /proc/kpageflags /proc/kpagecount. Theoretically this patch now limits the number of physical memory ranges to 127 instead of 254, but currently we have MAX_PHYSMEM_RANGES hardcoded to 8 which is sufficient for all existing parisc machines. Signed-off-by: Helge Deller <deller@gmx.de>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
#ifndef _PARISC_MMZONE_H
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#define _PARISC_MMZONE_H
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#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
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#ifdef CONFIG_DISCONTIGMEM
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extern int npmem_ranges;
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struct node_map_data {
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pg_data_t pg_data;
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};
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extern struct node_map_data node_data[];
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#define NODE_DATA(nid) (&node_data[nid].pg_data)
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/* We have these possible memory map layouts:
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* Astro: 0-3.75, 67.75-68, 4-64
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* zx1: 0-1, 257-260, 4-256
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* Stretch (N-class): 0-2, 4-32, 34-xxx
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*/
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/* Since each 1GB can only belong to one region (node), we can create
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* an index table for pfn to nid lookup; each entry in pfnnid_map
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* represents 1GB, and contains the node that the memory belongs to. */
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#define PFNNID_SHIFT (30 - PAGE_SHIFT)
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#define PFNNID_MAP_MAX 512 /* support 512GB */
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extern signed char pfnnid_map[PFNNID_MAP_MAX];
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#ifndef CONFIG_64BIT
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#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
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#else
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/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
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#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
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#endif
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static inline int pfn_to_nid(unsigned long pfn)
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{
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unsigned int i;
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if (unlikely(pfn_is_io(pfn)))
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return 0;
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i = pfn >> PFNNID_SHIFT;
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BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
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return pfnnid_map[i];
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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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#endif
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#endif /* _PARISC_MMZONE_H */
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