percpu: handle __percpu notations in UP accessors
[linux-2.6.git] / include / asm-generic / memory_model.h
1 #ifndef __ASM_MEMORY_MODEL_H
2 #define __ASM_MEMORY_MODEL_H
3
4 #ifndef __ASSEMBLY__
5
6 #if defined(CONFIG_FLATMEM)
7
8 #ifndef ARCH_PFN_OFFSET
9 #define ARCH_PFN_OFFSET         (0UL)
10 #endif
11
12 #elif defined(CONFIG_DISCONTIGMEM)
13
14 #ifndef arch_pfn_to_nid
15 #define arch_pfn_to_nid(pfn)    pfn_to_nid(pfn)
16 #endif
17
18 #ifndef arch_local_page_offset
19 #define arch_local_page_offset(pfn, nid)        \
20         ((pfn) - NODE_DATA(nid)->node_start_pfn)
21 #endif
22
23 #endif /* CONFIG_DISCONTIGMEM */
24
25 /*
26  * supports 3 memory models.
27  */
28 #if defined(CONFIG_FLATMEM)
29
30 #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
31 #define __page_to_pfn(page)     ((unsigned long)((page) - mem_map) + \
32                                  ARCH_PFN_OFFSET)
33 #elif defined(CONFIG_DISCONTIGMEM)
34
35 #define __pfn_to_page(pfn)                      \
36 ({      unsigned long __pfn = (pfn);            \
37         unsigned long __nid = arch_pfn_to_nid(__pfn);  \
38         NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
39 })
40
41 #define __page_to_pfn(pg)                                               \
42 ({      struct page *__pg = (pg);                                       \
43         struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg));     \
44         (unsigned long)(__pg - __pgdat->node_mem_map) +                 \
45          __pgdat->node_start_pfn;                                       \
46 })
47
48 #elif defined(CONFIG_SPARSEMEM_VMEMMAP)
49
50 /* memmap is virtually contiguous.  */
51 #define __pfn_to_page(pfn)      (vmemmap + (pfn))
52 #define __page_to_pfn(page)     (unsigned long)((page) - vmemmap)
53
54 #elif defined(CONFIG_SPARSEMEM)
55 /*
56  * Note: section's mem_map is encorded to reflect its start_pfn.
57  * section[i].section_mem_map == mem_map's address - start_pfn;
58  */
59 #define __page_to_pfn(pg)                                       \
60 ({      struct page *__pg = (pg);                               \
61         int __sec = page_to_section(__pg);                      \
62         (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
63 })
64
65 #define __pfn_to_page(pfn)                              \
66 ({      unsigned long __pfn = (pfn);                    \
67         struct mem_section *__sec = __pfn_to_section(__pfn);    \
68         __section_mem_map_addr(__sec) + __pfn;          \
69 })
70 #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
71
72 #define page_to_pfn __page_to_pfn
73 #define pfn_to_page __pfn_to_page
74
75 #endif /* __ASSEMBLY__ */
76
77 #endif