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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef _ASM_POWERPC_SPARSEMEM_H
- #define _ASM_POWERPC_SPARSEMEM_H 1
- #ifdef __KERNEL__
- #ifdef CONFIG_SPARSEMEM
- /*
- * SECTION_SIZE_BITS 2^N: how big each section will be
- * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
- */
- #define SECTION_SIZE_BITS 24
- /*
- * If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS
- * if we increase SECTIONS_WIDTH we will not store node details in page->flags and
- * page_to_nid does a page->section->node lookup
- * Hence only increase for VMEMMAP.
- */
- #ifdef CONFIG_SPARSEMEM_VMEMMAP
- #define MAX_PHYSMEM_BITS 47
- #else
- #define MAX_PHYSMEM_BITS 46
- #endif
- #endif /* CONFIG_SPARSEMEM */
- #ifdef CONFIG_MEMORY_HOTPLUG
- extern int create_section_mapping(unsigned long start, unsigned long end, int nid);
- extern int remove_section_mapping(unsigned long start, unsigned long end);
- #ifdef CONFIG_PPC_BOOK3S_64
- extern void resize_hpt_for_hotplug(unsigned long new_mem_size);
- #else
- static inline void resize_hpt_for_hotplug(unsigned long new_mem_size) { }
- #endif
- #ifdef CONFIG_NUMA
- extern int hot_add_scn_to_nid(unsigned long scn_addr);
- #else
- static inline int hot_add_scn_to_nid(unsigned long scn_addr)
- {
- return 0;
- }
- #endif /* CONFIG_NUMA */
- #endif /* CONFIG_MEMORY_HOTPLUG */
- #endif /* __KERNEL__ */
- #endif /* _ASM_POWERPC_SPARSEMEM_H */
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