64 	struct mem_section *section = NULL;  in sparse_index_alloc()  local
69 		section = kzalloc_node(array_size, GFP_KERNEL, nid);  in sparse_index_alloc()
71 		section = memblock_alloc_node(array_size, SMP_CACHE_BYTES,  in sparse_index_alloc()
73 		if (!section)  in sparse_index_alloc()
78 	return section;  in sparse_index_alloc()
84 	struct mem_section *section;  in sparse_index_init()  local
87 	 * An existing section is possible in the sub-section hotplug  in sparse_index_init()
89 	 * the existing section.  in sparse_index_init()
96 	section = sparse_index_alloc(nid);  in sparse_index_init()
97 	if (!section)  in sparse_index_init()
100 	mem_section[root] = section;  in sparse_index_init()
139  * mem_map, we use section_mem_map to store the section's NUMA
148 static inline int sparse_early_nid(struct mem_section *section)  in sparse_early_nid()  argument
150 	return (section->section_mem_map >> SECTION_NID_SHIFT);  in sparse_early_nid()
272 		unsigned long section = pfn_to_section_nr(pfn);  in memory_present()  local
275 		sparse_index_init(section, nid);  in memory_present()
276 		set_section_nid(section, nid);  in memory_present()
278 		ms = __nr_to_section(section);  in memory_present()
357 	 * page being freed and making a section unremovable while  in sparse_early_usemaps_alloc_pgdat_section()
359 	 * a pgdat can prevent a section being removed. If section A  in sparse_early_usemaps_alloc_pgdat_section()
360 	 * contains a pgdat and section B contains the usemap, both  in sparse_early_usemaps_alloc_pgdat_section()
362 	 * from the same section as the pgdat where possible to avoid  in sparse_early_usemaps_alloc_pgdat_section()
406 		pr_info("node %d must be removed before remove section %ld\n",  in check_usemap_section_nr()
412 	 * Some platforms allow un-removable section because they will just  in check_usemap_section_nr()
414 	 * Just notify un-removable section's number here.  in check_usemap_section_nr()
416 …pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\…  in check_usemap_section_nr()
480 	 * and we want it to be properly aligned to the section size - this is  in sparse_buffer_init()
573  * for each and record the physical to section mapping.
685 				"section already deactivated (%#lx + %ld)\n",  in clear_subsection_map()
752 		 * When this function is called, the removing section is  in free_map_bootmem()
754 		 * from page allocator. If removing section's memmap is placed  in free_map_bootmem()
755 		 * on the same section, it must not be freed.  in free_map_bootmem()
784  * 1. deactivation of a partial hot-added section (only possible in
786  *      a) section was present at memory init.
787  *      b) section was hot-added post memory init.
788  * 2. deactivation of a complete hot-added section.
789  * 3. deactivation of a complete section from memory init.
812 		 * When removing an early section, the usage map is kept (as the  in section_deactivate()
814 		 * will be re-used when re-adding the section - which is then no  in section_deactivate()
815 		 * longer an early section. If the usage map is PageReserved, it  in section_deactivate()
824 		 * Mark the section invalid so that valid_section()  in section_deactivate()
870 	 * referenced.  If we hot-add memory into such a section then we  in section_activate()
887  * sparse_add_section - add a memory section, or populate an existing one
888  * @nid: The node to add section on
890  * @nr_pages: number of pfns to add in the section
895  * Note that only VMEMMAP supports sub-section aligned hotplug,
901  * * -EEXIST	- Section has been present.
930 	/* Align memmap to section boundary in the subsection case */  in sparse_add_section()
944 	 * A further optimization is to have per section refcounted  in clear_hwpoisoned_pages()