24  * 1) mem_section	- memory sections, mem_map's for valid memory
132 	unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);  in mminit_validate_memmodel_limits()
142 		WARN_ON_ONCE(1);  in mminit_validate_memmodel_limits()
149 		WARN_ON_ONCE(1);  in mminit_validate_memmodel_limits()
164 static void __section_mark_present(struct mem_section *ms,  in __section_mark_present()  argument
170 	ms->section_mem_map |= SECTION_MARKED_PRESENT;  in __section_mark_present()
174 	for (section_nr = next_present_section_nr(start-1);	\
175 	     ((section_nr != -1) &&				\
181 	return next_present_section_nr(-1);  in first_present_section_nr()
189 	int end = subsection_map_index(pfn + nr_pages - 1);  in subsection_mask_set()
191 	bitmap_set(map, idx, end - idx + 1);  in subsection_mask_set()
196 	int end_sec = pfn_to_section_nr(pfn + nr_pages - 1);  in subsection_map_init()
203 		struct mem_section *ms;  in subsection_map_init()  local
208 		ms = __nr_to_section(nr);  in subsection_map_init()
209 		subsection_mask_set(ms->usage->subsection_map, pfn, pfns);  in subsection_map_init()
213 				subsection_map_index(pfn + pfns - 1));  in subsection_map_init()
235 		align = 1 << (INTERNODE_CACHE_SHIFT);  in memory_present()
247 		struct mem_section *ms;  in memory_present()  local
252 		ms = __nr_to_section(section);  in memory_present()
253 		if (!ms->section_mem_map) {  in memory_present()
254 			ms->section_mem_map = sparse_encode_early_nid(nid) |  in memory_present()
256 			__section_mark_present(ms, section);  in memory_present()
284 	BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT));  in sparse_encode_mem_map()
301 static void __meminit sparse_init_one_section(struct mem_section *ms,  in sparse_init_one_section()  argument
305 	ms->section_mem_map &= ~SECTION_MAP_MASK;  in sparse_init_one_section()
306 	ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum)  in sparse_init_one_section()
308 	ms->usage = usage;  in sparse_init_one_section()
350 	limit = goal + (1UL << PA_SECTION_SHIFT);  in sparse_early_usemaps_alloc_pgdat_section()
545 		struct mem_section *ms;  in sparse_init_nid()  local
549 		ms = __nr_to_section(pnum);  in sparse_init_nid()
550 		ms->section_mem_map = 0;  in sparse_init_nid()
560 	unsigned long pnum_end, pnum_begin, map_count = 1;  in sparse_init()
571 	for_each_present_section_nr(pnum_begin + 1, pnum_end) {  in sparse_init()
582 		map_count = 1;  in sparse_init()
598 		struct mem_section *ms;  in online_mem_sections()  local
604 		ms = __nr_to_section(section_nr);  in online_mem_sections()
605 		ms->section_mem_map |= SECTION_IS_ONLINE;  in online_mem_sections()
616 		struct mem_section *ms;  in offline_mem_sections()  local
625 		ms = __nr_to_section(section_nr);  in offline_mem_sections()
626 		ms->section_mem_map &= ~SECTION_IS_ONLINE;  in offline_mem_sections()
657 	struct mem_section *ms = __pfn_to_section(pfn);  in clear_subsection_map()  local
658 	unsigned long *subsection_map = ms->usage  in clear_subsection_map()
659 		? &ms->usage->subsection_map[0] : NULL;  in clear_subsection_map()
674 static bool is_subsection_map_empty(struct mem_section *ms)  in is_subsection_map_empty()  argument
676 	return bitmap_empty(&ms->usage->subsection_map[0],  in is_subsection_map_empty()
682 	struct mem_section *ms = __pfn_to_section(pfn);  in fill_subsection_map()  local
689 	subsection_map = &ms->usage->subsection_map[0];  in fill_subsection_map()
750 static bool is_subsection_map_empty(struct mem_section *ms)  in is_subsection_map_empty()  argument
765  * 1. deactivation of a partial hot-added section (only possible in
772  * For 1, when subsection_map does not empty we will not be freeing the
780 	struct mem_section *ms = __pfn_to_section(pfn);  in section_deactivate()  local
781 	bool section_is_early = early_section(ms);  in section_deactivate()
788 	empty = is_subsection_map_empty(ms);  in section_deactivate()
799 		if (!PageReserved(virt_to_page(ms->usage))) {  in section_deactivate()
800 			kfree(ms->usage);  in section_deactivate()
801 			ms->usage = NULL;  in section_deactivate()
803 		memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);  in section_deactivate()
807 		 * ms->usage array.  in section_deactivate()
809 		ms->section_mem_map &= ~SECTION_HAS_MEM_MAP;  in section_deactivate()
822 		ms->section_mem_map = (unsigned long)NULL;  in section_deactivate()
828 	struct mem_section *ms = __pfn_to_section(pfn);  in section_activate()  local
833 	if (!ms->usage) {  in section_activate()
837 		ms->usage = usage;  in section_activate()
843 			ms->usage = NULL;  in section_activate()
855 	if (nr_pages < PAGES_PER_SECTION && early_section(ms))  in section_activate()
889 	struct mem_section *ms;  in sparse_add_section()  local
907 	ms = __nr_to_section(section_nr);  in sparse_add_section()
909 	__section_mark_present(ms, section_nr);  in sparse_add_section()
914 	sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0);  in sparse_add_section()
946 void sparse_remove_section(struct mem_section *ms, unsigned long pfn,  in sparse_remove_section()  argument