1 #ifndef _ASM_POWERPC_SPARSEMEM_H
2 #define _ASM_POWERPC_SPARSEMEM_H 1
3 #ifdef __KERNEL__
4 
5 #ifdef CONFIG_SPARSEMEM
6 /*
7  * SECTION_SIZE_BITS		2^N: how big each section will be
8  * MAX_PHYSADDR_BITS		2^N: how much physical address space we have
9  * MAX_PHYSMEM_BITS		2^N: how much memory we can have in that space
10  */
11 #define SECTION_SIZE_BITS       24
12 
13 #define MAX_PHYSADDR_BITS       46
14 #define MAX_PHYSMEM_BITS        46
15 
16 #endif /* CONFIG_SPARSEMEM */
17 
18 #ifdef CONFIG_MEMORY_HOTPLUG
19 extern int create_section_mapping(unsigned long start, unsigned long end);
20 extern int remove_section_mapping(unsigned long start, unsigned long end);
21 
22 #ifdef CONFIG_PPC_BOOK3S_64
23 extern void resize_hpt_for_hotplug(unsigned long new_mem_size);
24 #else
25 static inline void resize_hpt_for_hotplug(unsigned long new_mem_size) { }
26 #endif
27 
28 #ifdef CONFIG_NUMA
29 extern int hot_add_scn_to_nid(unsigned long scn_addr);
30 #else
31 static inline int hot_add_scn_to_nid(unsigned long scn_addr)
32 {
33 	return 0;
34 }
35 #endif /* CONFIG_NUMA */
36 #endif /* CONFIG_MEMORY_HOTPLUG */
37 
38 #endif /* __KERNEL__ */
39 #endif /* _ASM_POWERPC_SPARSEMEM_H */
40