blob: b8c11e063ff0746316fb792f4fe1dde0094cb828 [file] [log] [blame]
Dave Hansen3947be12005-10-29 18:16:54 -07001/*
2 * linux/mm/memory_hotplug.c
3 *
4 * Copyright (C)
5 */
6
Dave Hansen3947be12005-10-29 18:16:54 -07007#include <linux/stddef.h>
8#include <linux/mm.h>
9#include <linux/swap.h>
10#include <linux/interrupt.h>
11#include <linux/pagemap.h>
Dave Hansen3947be12005-10-29 18:16:54 -070012#include <linux/compiler.h>
Paul Gortmakerb95f1b312011-10-16 02:01:52 -040013#include <linux/export.h>
Dave Hansen3947be12005-10-29 18:16:54 -070014#include <linux/pagevec.h>
Chandra Seetharaman2d1d43f2006-09-29 02:01:25 -070015#include <linux/writeback.h>
Dave Hansen3947be12005-10-29 18:16:54 -070016#include <linux/slab.h>
17#include <linux/sysctl.h>
18#include <linux/cpu.h>
19#include <linux/memory.h>
Dan Williams4b94ffd2016-01-15 16:56:22 -080020#include <linux/memremap.h>
Dave Hansen3947be12005-10-29 18:16:54 -070021#include <linux/memory_hotplug.h>
22#include <linux/highmem.h>
23#include <linux/vmalloc.h>
KAMEZAWA Hiroyuki0a547032006-06-27 02:53:35 -070024#include <linux/ioport.h>
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -070025#include <linux/delay.h>
26#include <linux/migrate.h>
27#include <linux/page-isolation.h>
Badari Pulavarty71088782008-10-18 20:25:58 -070028#include <linux/pfn.h>
Andi Kleen6ad696d2009-11-17 14:06:22 -080029#include <linux/suspend.h>
KOSAKI Motohiro6d9c2852009-12-14 17:58:11 -080030#include <linux/mm_inline.h>
akpm@linux-foundation.orgd96ae532010-03-05 13:41:58 -080031#include <linux/firmware-map.h>
Tang Chen60a5a192013-02-22 16:33:14 -080032#include <linux/stop_machine.h>
Naoya Horiguchic8721bb2013-09-11 14:22:09 -070033#include <linux/hugetlb.h>
Tang Chenc5320922013-11-12 15:08:10 -080034#include <linux/memblock.h>
Tang Chenf784a3f2014-11-13 15:19:39 -080035#include <linux/bootmem.h>
Vlastimil Babka698b1b32016-03-17 14:18:08 -070036#include <linux/compaction.h>
Dave Hansen3947be12005-10-29 18:16:54 -070037
38#include <asm/tlbflush.h>
39
Adrian Bunk1e5ad9a2008-04-28 20:40:08 +030040#include "internal.h"
41
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -070042/*
43 * online_page_callback contains pointer to current page onlining function.
44 * Initially it is generic_online_page(). If it is required it could be
45 * changed by calling set_online_page_callback() for callback registration
46 * and restore_online_page_callback() for generic callback restore.
47 */
48
49static void generic_online_page(struct page *page);
50
51static online_page_callback_t online_page_callback = generic_online_page;
Vladimir Davydovbfc8c902014-06-04 16:07:18 -070052static DEFINE_MUTEX(online_page_callback_lock);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -070053
Vladimir Davydovbfc8c902014-06-04 16:07:18 -070054/* The same as the cpu_hotplug lock, but for memory hotplug. */
55static struct {
56 struct task_struct *active_writer;
57 struct mutex lock; /* Synchronizes accesses to refcount, */
58 /*
59 * Also blocks the new readers during
60 * an ongoing mem hotplug operation.
61 */
62 int refcount;
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -080063
Vladimir Davydovbfc8c902014-06-04 16:07:18 -070064#ifdef CONFIG_DEBUG_LOCK_ALLOC
65 struct lockdep_map dep_map;
66#endif
67} mem_hotplug = {
68 .active_writer = NULL,
69 .lock = __MUTEX_INITIALIZER(mem_hotplug.lock),
70 .refcount = 0,
71#ifdef CONFIG_DEBUG_LOCK_ALLOC
72 .dep_map = {.name = "mem_hotplug.lock" },
73#endif
74};
75
76/* Lockdep annotations for get/put_online_mems() and mem_hotplug_begin/end() */
77#define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map)
78#define memhp_lock_acquire() lock_map_acquire(&mem_hotplug.dep_map)
79#define memhp_lock_release() lock_map_release(&mem_hotplug.dep_map)
80
Vitaly Kuznetsov8604d9e2016-05-19 17:13:03 -070081#ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -070082bool memhp_auto_online;
Vitaly Kuznetsov8604d9e2016-05-19 17:13:03 -070083#else
84bool memhp_auto_online = true;
85#endif
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -070086EXPORT_SYMBOL_GPL(memhp_auto_online);
87
Vitaly Kuznetsov86dd9952016-05-19 17:13:06 -070088static int __init setup_memhp_default_state(char *str)
89{
90 if (!strcmp(str, "online"))
91 memhp_auto_online = true;
92 else if (!strcmp(str, "offline"))
93 memhp_auto_online = false;
94
95 return 1;
96}
97__setup("memhp_default_state=", setup_memhp_default_state);
98
Vladimir Davydovbfc8c902014-06-04 16:07:18 -070099void get_online_mems(void)
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800100{
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700101 might_sleep();
102 if (mem_hotplug.active_writer == current)
103 return;
104 memhp_lock_acquire_read();
105 mutex_lock(&mem_hotplug.lock);
106 mem_hotplug.refcount++;
107 mutex_unlock(&mem_hotplug.lock);
108
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800109}
110
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700111void put_online_mems(void)
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800112{
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700113 if (mem_hotplug.active_writer == current)
114 return;
115 mutex_lock(&mem_hotplug.lock);
116
117 if (WARN_ON(!mem_hotplug.refcount))
118 mem_hotplug.refcount++; /* try to fix things up */
119
120 if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer))
121 wake_up_process(mem_hotplug.active_writer);
122 mutex_unlock(&mem_hotplug.lock);
123 memhp_lock_release();
124
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800125}
126
David Rientjes30467e02015-04-14 15:45:11 -0700127void mem_hotplug_begin(void)
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700128{
129 mem_hotplug.active_writer = current;
130
131 memhp_lock_acquire();
132 for (;;) {
133 mutex_lock(&mem_hotplug.lock);
134 if (likely(!mem_hotplug.refcount))
135 break;
136 __set_current_state(TASK_UNINTERRUPTIBLE);
137 mutex_unlock(&mem_hotplug.lock);
138 schedule();
139 }
140}
141
David Rientjes30467e02015-04-14 15:45:11 -0700142void mem_hotplug_done(void)
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700143{
144 mem_hotplug.active_writer = NULL;
145 mutex_unlock(&mem_hotplug.lock);
146 memhp_lock_release();
147}
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800148
Keith Mannthey45e0b782006-09-30 23:27:09 -0700149/* add this memory to iomem resource */
150static struct resource *register_memory_resource(u64 start, u64 size)
151{
152 struct resource *res;
153 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
Vitaly Kuznetsov6f754ba2016-01-14 15:21:55 -0800154 if (!res)
155 return ERR_PTR(-ENOMEM);
Keith Mannthey45e0b782006-09-30 23:27:09 -0700156
157 res->name = "System RAM";
158 res->start = start;
159 res->end = start + size - 1;
Toshi Kani782b8662016-01-26 21:57:24 +0100160 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
Keith Mannthey45e0b782006-09-30 23:27:09 -0700161 if (request_resource(&iomem_resource, res) < 0) {
Toshi Kani4996eed2013-07-03 15:02:39 -0700162 pr_debug("System RAM resource %pR cannot be added\n", res);
Keith Mannthey45e0b782006-09-30 23:27:09 -0700163 kfree(res);
Vitaly Kuznetsov6f754ba2016-01-14 15:21:55 -0800164 return ERR_PTR(-EEXIST);
Keith Mannthey45e0b782006-09-30 23:27:09 -0700165 }
166 return res;
167}
168
169static void release_memory_resource(struct resource *res)
170{
171 if (!res)
172 return;
173 release_resource(res);
174 kfree(res);
175 return;
176}
177
Keith Mannthey53947022006-09-30 23:27:08 -0700178#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800179void get_page_bootmem(unsigned long info, struct page *page,
180 unsigned long type)
Yasunori Goto04753272008-04-28 02:13:31 -0700181{
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800182 page->lru.next = (struct list_head *) type;
Yasunori Goto04753272008-04-28 02:13:31 -0700183 SetPagePrivate(page);
184 set_page_private(page, info);
Joonsoo Kimfe896d12016-03-17 14:19:26 -0700185 page_ref_inc(page);
Yasunori Goto04753272008-04-28 02:13:31 -0700186}
187
Jiang Liu170a5a72013-07-03 15:03:17 -0700188void put_page_bootmem(struct page *page)
Yasunori Goto04753272008-04-28 02:13:31 -0700189{
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800190 unsigned long type;
Yasunori Goto04753272008-04-28 02:13:31 -0700191
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800192 type = (unsigned long) page->lru.next;
193 BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
194 type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
Yasunori Goto04753272008-04-28 02:13:31 -0700195
Joonsoo Kimfe896d12016-03-17 14:19:26 -0700196 if (page_ref_dec_return(page) == 1) {
Yasunori Goto04753272008-04-28 02:13:31 -0700197 ClearPagePrivate(page);
198 set_page_private(page, 0);
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800199 INIT_LIST_HEAD(&page->lru);
Jiang Liu170a5a72013-07-03 15:03:17 -0700200 free_reserved_page(page);
Yasunori Goto04753272008-04-28 02:13:31 -0700201 }
Yasunori Goto04753272008-04-28 02:13:31 -0700202}
203
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800204#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
205#ifndef CONFIG_SPARSEMEM_VMEMMAP
Adrian Bunkd92bc312008-07-23 21:28:12 -0700206static void register_page_bootmem_info_section(unsigned long start_pfn)
Yasunori Goto04753272008-04-28 02:13:31 -0700207{
208 unsigned long *usemap, mapsize, section_nr, i;
209 struct mem_section *ms;
210 struct page *page, *memmap;
211
Yasunori Goto04753272008-04-28 02:13:31 -0700212 section_nr = pfn_to_section_nr(start_pfn);
213 ms = __nr_to_section(section_nr);
214
215 /* Get section's memmap address */
216 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
217
218 /*
219 * Get page for the memmap's phys address
220 * XXX: need more consideration for sparse_vmemmap...
221 */
222 page = virt_to_page(memmap);
223 mapsize = sizeof(struct page) * PAGES_PER_SECTION;
224 mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
225
226 /* remember memmap's page */
227 for (i = 0; i < mapsize; i++, page++)
228 get_page_bootmem(section_nr, page, SECTION_INFO);
229
230 usemap = __nr_to_section(section_nr)->pageblock_flags;
231 page = virt_to_page(usemap);
232
233 mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
234
235 for (i = 0; i < mapsize; i++, page++)
Yasunori Gotoaf370fb2008-07-23 21:28:17 -0700236 get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
Yasunori Goto04753272008-04-28 02:13:31 -0700237
238}
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800239#else /* CONFIG_SPARSEMEM_VMEMMAP */
240static void register_page_bootmem_info_section(unsigned long start_pfn)
241{
242 unsigned long *usemap, mapsize, section_nr, i;
243 struct mem_section *ms;
244 struct page *page, *memmap;
245
246 if (!pfn_valid(start_pfn))
247 return;
248
249 section_nr = pfn_to_section_nr(start_pfn);
250 ms = __nr_to_section(section_nr);
251
252 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
253
254 register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);
255
256 usemap = __nr_to_section(section_nr)->pageblock_flags;
257 page = virt_to_page(usemap);
258
259 mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
260
261 for (i = 0; i < mapsize; i++, page++)
262 get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
263}
264#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
Yasunori Goto04753272008-04-28 02:13:31 -0700265
Linus Torvalds7ded3842016-05-27 15:23:32 -0700266void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
Yasunori Goto04753272008-04-28 02:13:31 -0700267{
268 unsigned long i, pfn, end_pfn, nr_pages;
269 int node = pgdat->node_id;
270 struct page *page;
Yasunori Goto04753272008-04-28 02:13:31 -0700271
272 nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
273 page = virt_to_page(pgdat);
274
275 for (i = 0; i < nr_pages; i++, page++)
276 get_page_bootmem(node, page, NODE_INFO);
277
Yasunori Goto04753272008-04-28 02:13:31 -0700278 pfn = pgdat->node_start_pfn;
Cody P Schaferc1f19492013-02-22 16:35:32 -0800279 end_pfn = pgdat_end_pfn(pgdat);
Yasunori Goto04753272008-04-28 02:13:31 -0700280
Tang Chen7e9f5eb2013-07-08 16:00:23 -0700281 /* register section info */
qiuxishif14851a2012-09-17 14:09:24 -0700282 for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
283 /*
284 * Some platforms can assign the same pfn to multiple nodes - on
285 * node0 as well as nodeN. To avoid registering a pfn against
286 * multiple nodes we check that this pfn does not already
Tang Chen7e9f5eb2013-07-08 16:00:23 -0700287 * reside in some other nodes.
qiuxishif14851a2012-09-17 14:09:24 -0700288 */
Yang Shif65e91df2016-05-27 14:27:32 -0700289 if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node))
qiuxishif14851a2012-09-17 14:09:24 -0700290 register_page_bootmem_info_section(pfn);
291 }
Yasunori Goto04753272008-04-28 02:13:31 -0700292}
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800293#endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
Yasunori Goto04753272008-04-28 02:13:31 -0700294
Fabian Frederickf2765402014-08-06 16:04:57 -0700295static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn,
296 unsigned long end_pfn)
Heiko Carstens76cdd582008-05-14 16:05:52 -0700297{
298 unsigned long old_zone_end_pfn;
299
300 zone_span_writelock(zone);
301
Xishi Qiuc33bc312013-09-11 14:21:44 -0700302 old_zone_end_pfn = zone_end_pfn(zone);
Xishi Qiu8080fc02013-09-11 14:21:45 -0700303 if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn)
Heiko Carstens76cdd582008-05-14 16:05:52 -0700304 zone->zone_start_pfn = start_pfn;
305
306 zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
307 zone->zone_start_pfn;
308
309 zone_span_writeunlock(zone);
310}
311
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800312static void resize_zone(struct zone *zone, unsigned long start_pfn,
313 unsigned long end_pfn)
314{
315 zone_span_writelock(zone);
316
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800317 if (end_pfn - start_pfn) {
318 zone->zone_start_pfn = start_pfn;
319 zone->spanned_pages = end_pfn - start_pfn;
320 } else {
321 /*
322 * make it consist as free_area_init_core(),
323 * if spanned_pages = 0, then keep start_pfn = 0
324 */
325 zone->zone_start_pfn = 0;
326 zone->spanned_pages = 0;
327 }
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800328
329 zone_span_writeunlock(zone);
330}
331
332static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
333 unsigned long end_pfn)
334{
335 enum zone_type zid = zone_idx(zone);
336 int nid = zone->zone_pgdat->node_id;
337 unsigned long pfn;
338
339 for (pfn = start_pfn; pfn < end_pfn; pfn++)
340 set_page_links(pfn_to_page(pfn), zid, nid, pfn);
341}
342
Cody P Schaferf6bbb782013-02-22 16:35:30 -0800343/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
Santosh Shilimkar9e43aa22014-01-21 15:50:43 -0800344 * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */
Cody P Schaferf6bbb782013-02-22 16:35:30 -0800345static int __ref ensure_zone_is_initialized(struct zone *zone,
346 unsigned long start_pfn, unsigned long num_pages)
347{
348 if (!zone_is_initialized(zone))
Yaowei Baib171e402015-11-05 18:47:06 -0800349 return init_currently_empty_zone(zone, start_pfn, num_pages);
350
Cody P Schaferf6bbb782013-02-22 16:35:30 -0800351 return 0;
352}
353
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800354static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800355 unsigned long start_pfn, unsigned long end_pfn)
356{
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800357 int ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800358 unsigned long flags;
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800359 unsigned long z1_start_pfn;
360
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800361 ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn);
362 if (ret)
363 return ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800364
365 pgdat_resize_lock(z1->zone_pgdat, &flags);
366
367 /* can't move pfns which are higher than @z2 */
Cody P Schafer108bcc92013-02-22 16:35:23 -0800368 if (end_pfn > zone_end_pfn(z2))
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800369 goto out_fail;
Jiang Liu834405c2013-07-03 15:03:04 -0700370 /* the move out part must be at the left most of @z2 */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800371 if (start_pfn > z2->zone_start_pfn)
372 goto out_fail;
373 /* must included/overlap */
374 if (end_pfn <= z2->zone_start_pfn)
375 goto out_fail;
376
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800377 /* use start_pfn for z1's start_pfn if z1 is empty */
Xishi Qiu8080fc02013-09-11 14:21:45 -0700378 if (!zone_is_empty(z1))
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800379 z1_start_pfn = z1->zone_start_pfn;
380 else
381 z1_start_pfn = start_pfn;
382
383 resize_zone(z1, z1_start_pfn, end_pfn);
Cody P Schafer108bcc92013-02-22 16:35:23 -0800384 resize_zone(z2, end_pfn, zone_end_pfn(z2));
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800385
386 pgdat_resize_unlock(z1->zone_pgdat, &flags);
387
388 fix_zone_id(z1, start_pfn, end_pfn);
389
390 return 0;
391out_fail:
392 pgdat_resize_unlock(z1->zone_pgdat, &flags);
393 return -1;
394}
395
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800396static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2,
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800397 unsigned long start_pfn, unsigned long end_pfn)
398{
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800399 int ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800400 unsigned long flags;
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800401 unsigned long z2_end_pfn;
402
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800403 ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn);
404 if (ret)
405 return ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800406
407 pgdat_resize_lock(z1->zone_pgdat, &flags);
408
409 /* can't move pfns which are lower than @z1 */
410 if (z1->zone_start_pfn > start_pfn)
411 goto out_fail;
412 /* the move out part mast at the right most of @z1 */
Cody P Schafer108bcc92013-02-22 16:35:23 -0800413 if (zone_end_pfn(z1) > end_pfn)
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800414 goto out_fail;
415 /* must included/overlap */
Cody P Schafer108bcc92013-02-22 16:35:23 -0800416 if (start_pfn >= zone_end_pfn(z1))
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800417 goto out_fail;
418
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800419 /* use end_pfn for z2's end_pfn if z2 is empty */
Xishi Qiu8080fc02013-09-11 14:21:45 -0700420 if (!zone_is_empty(z2))
Cody P Schafer108bcc92013-02-22 16:35:23 -0800421 z2_end_pfn = zone_end_pfn(z2);
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800422 else
423 z2_end_pfn = end_pfn;
424
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800425 resize_zone(z1, z1->zone_start_pfn, start_pfn);
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800426 resize_zone(z2, start_pfn, z2_end_pfn);
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800427
428 pgdat_resize_unlock(z1->zone_pgdat, &flags);
429
430 fix_zone_id(z2, start_pfn, end_pfn);
431
432 return 0;
433out_fail:
434 pgdat_resize_unlock(z1->zone_pgdat, &flags);
435 return -1;
436}
437
Reza Arbabe51e6c82016-07-26 15:22:20 -0700438static struct zone * __meminit move_pfn_range(int zone_shift,
439 unsigned long start_pfn, unsigned long end_pfn)
440{
441 struct zone *zone = page_zone(pfn_to_page(start_pfn));
442 int ret = 0;
443
444 if (zone_shift < 0)
445 ret = move_pfn_range_left(zone + zone_shift, zone,
446 start_pfn, end_pfn);
447 else if (zone_shift)
448 ret = move_pfn_range_right(zone, zone + zone_shift,
449 start_pfn, end_pfn);
450
451 if (ret)
452 return NULL;
453
454 return zone + zone_shift;
455}
456
Fabian Frederickf2765402014-08-06 16:04:57 -0700457static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
458 unsigned long end_pfn)
Heiko Carstens76cdd582008-05-14 16:05:52 -0700459{
Xishi Qiu83285c72013-11-12 15:07:19 -0800460 unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat);
Heiko Carstens76cdd582008-05-14 16:05:52 -0700461
Tang Chen712cd382012-12-11 16:01:07 -0800462 if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn)
Heiko Carstens76cdd582008-05-14 16:05:52 -0700463 pgdat->node_start_pfn = start_pfn;
464
465 pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
466 pgdat->node_start_pfn;
467}
468
Al Viro31168482008-11-22 17:33:24 +0000469static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
Dave Hansen3947be12005-10-29 18:16:54 -0700470{
471 struct pglist_data *pgdat = zone->zone_pgdat;
472 int nr_pages = PAGES_PER_SECTION;
473 int nid = pgdat->node_id;
474 int zone_type;
Mel Gormane298ff72015-08-06 15:46:51 -0700475 unsigned long flags, pfn;
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800476 int ret;
Dave Hansen3947be12005-10-29 18:16:54 -0700477
478 zone_type = zone - pgdat->node_zones;
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800479 ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages);
480 if (ret)
481 return ret;
Heiko Carstens76cdd582008-05-14 16:05:52 -0700482
Heiko Carstens76cdd582008-05-14 16:05:52 -0700483 pgdat_resize_lock(zone->zone_pgdat, &flags);
484 grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages);
485 grow_pgdat_span(zone->zone_pgdat, phys_start_pfn,
486 phys_start_pfn + nr_pages);
487 pgdat_resize_unlock(zone->zone_pgdat, &flags);
Dave Hansena2f3aa022007-01-10 23:15:30 -0800488 memmap_init_zone(nr_pages, nid, zone_type,
489 phys_start_pfn, MEMMAP_HOTPLUG);
Mel Gormane298ff72015-08-06 15:46:51 -0700490
491 /* online_page_range is called later and expects pages reserved */
492 for (pfn = phys_start_pfn; pfn < phys_start_pfn + nr_pages; pfn++) {
493 if (!pfn_valid(pfn))
494 continue;
495
496 SetPageReserved(pfn_to_page(pfn));
497 }
Yasunori Goto718127c2006-06-23 02:03:10 -0700498 return 0;
Dave Hansen3947be12005-10-29 18:16:54 -0700499}
500
Gary Hadec04fc582009-01-06 14:39:14 -0800501static int __meminit __add_section(int nid, struct zone *zone,
502 unsigned long phys_start_pfn)
Dave Hansen3947be12005-10-29 18:16:54 -0700503{
Dave Hansen3947be12005-10-29 18:16:54 -0700504 int ret;
505
KAMEZAWA Hiroyukiebd15302006-08-05 12:15:06 -0700506 if (pfn_valid(phys_start_pfn))
507 return -EEXIST;
508
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800509 ret = sparse_add_one_section(zone, phys_start_pfn);
Dave Hansen3947be12005-10-29 18:16:54 -0700510
511 if (ret < 0)
512 return ret;
513
Yasunori Goto718127c2006-06-23 02:03:10 -0700514 ret = __add_zone(zone, phys_start_pfn);
515
516 if (ret < 0)
517 return ret;
518
Gary Hadec04fc582009-01-06 14:39:14 -0800519 return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
Dave Hansen3947be12005-10-29 18:16:54 -0700520}
521
David Rientjes4edd7ce2013-04-29 15:08:22 -0700522/*
523 * Reasonably generic function for adding memory. It is
524 * expected that archs that support memory hotplug will
525 * call this function after deciding the zone to which to
526 * add the new pages.
527 */
528int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
529 unsigned long nr_pages)
530{
531 unsigned long i;
532 int err = 0;
533 int start_sec, end_sec;
Dan Williams4b94ffd2016-01-15 16:56:22 -0800534 struct vmem_altmap *altmap;
535
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700536 clear_zone_contiguous(zone);
537
David Rientjes4edd7ce2013-04-29 15:08:22 -0700538 /* during initialize mem_map, align hot-added range to section */
539 start_sec = pfn_to_section_nr(phys_start_pfn);
540 end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
541
Dan Williams4b94ffd2016-01-15 16:56:22 -0800542 altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn));
543 if (altmap) {
544 /*
545 * Validate altmap is within bounds of the total request
546 */
547 if (altmap->base_pfn != phys_start_pfn
548 || vmem_altmap_offset(altmap) > nr_pages) {
549 pr_warn_once("memory add fail, invalid altmap\n");
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700550 err = -EINVAL;
551 goto out;
Dan Williams4b94ffd2016-01-15 16:56:22 -0800552 }
553 altmap->alloc = 0;
554 }
555
David Rientjes4edd7ce2013-04-29 15:08:22 -0700556 for (i = start_sec; i <= end_sec; i++) {
Sheng Yong19c07d52015-04-14 15:44:54 -0700557 err = __add_section(nid, zone, section_nr_to_pfn(i));
David Rientjes4edd7ce2013-04-29 15:08:22 -0700558
559 /*
560 * EEXIST is finally dealt with by ioresource collision
561 * check. see add_memory() => register_memory_resource()
562 * Warning will be printed if there is collision.
563 */
564 if (err && (err != -EEXIST))
565 break;
566 err = 0;
567 }
Zhu Guihuac435a392015-06-24 16:58:42 -0700568 vmemmap_populate_print_last();
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700569out:
570 set_zone_contiguous(zone);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700571 return err;
572}
573EXPORT_SYMBOL_GPL(__add_pages);
574
575#ifdef CONFIG_MEMORY_HOTREMOVE
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800576/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
577static int find_smallest_section_pfn(int nid, struct zone *zone,
578 unsigned long start_pfn,
579 unsigned long end_pfn)
580{
581 struct mem_section *ms;
582
583 for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) {
584 ms = __pfn_to_section(start_pfn);
585
586 if (unlikely(!valid_section(ms)))
587 continue;
588
589 if (unlikely(pfn_to_nid(start_pfn) != nid))
590 continue;
591
592 if (zone && zone != page_zone(pfn_to_page(start_pfn)))
593 continue;
594
595 return start_pfn;
596 }
597
598 return 0;
599}
600
601/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
602static int find_biggest_section_pfn(int nid, struct zone *zone,
603 unsigned long start_pfn,
604 unsigned long end_pfn)
605{
606 struct mem_section *ms;
607 unsigned long pfn;
608
609 /* pfn is the end pfn of a memory section. */
610 pfn = end_pfn - 1;
611 for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) {
612 ms = __pfn_to_section(pfn);
613
614 if (unlikely(!valid_section(ms)))
615 continue;
616
617 if (unlikely(pfn_to_nid(pfn) != nid))
618 continue;
619
620 if (zone && zone != page_zone(pfn_to_page(pfn)))
621 continue;
622
623 return pfn;
624 }
625
626 return 0;
627}
628
629static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
630 unsigned long end_pfn)
631{
Xishi Qiuc33bc312013-09-11 14:21:44 -0700632 unsigned long zone_start_pfn = zone->zone_start_pfn;
633 unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */
634 unsigned long zone_end_pfn = z;
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800635 unsigned long pfn;
636 struct mem_section *ms;
637 int nid = zone_to_nid(zone);
638
639 zone_span_writelock(zone);
640 if (zone_start_pfn == start_pfn) {
641 /*
642 * If the section is smallest section in the zone, it need
643 * shrink zone->zone_start_pfn and zone->zone_spanned_pages.
644 * In this case, we find second smallest valid mem_section
645 * for shrinking zone.
646 */
647 pfn = find_smallest_section_pfn(nid, zone, end_pfn,
648 zone_end_pfn);
649 if (pfn) {
650 zone->zone_start_pfn = pfn;
651 zone->spanned_pages = zone_end_pfn - pfn;
652 }
653 } else if (zone_end_pfn == end_pfn) {
654 /*
655 * If the section is biggest section in the zone, it need
656 * shrink zone->spanned_pages.
657 * In this case, we find second biggest valid mem_section for
658 * shrinking zone.
659 */
660 pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn,
661 start_pfn);
662 if (pfn)
663 zone->spanned_pages = pfn - zone_start_pfn + 1;
664 }
665
666 /*
667 * The section is not biggest or smallest mem_section in the zone, it
668 * only creates a hole in the zone. So in this case, we need not
669 * change the zone. But perhaps, the zone has only hole data. Thus
670 * it check the zone has only hole or not.
671 */
672 pfn = zone_start_pfn;
673 for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) {
674 ms = __pfn_to_section(pfn);
675
676 if (unlikely(!valid_section(ms)))
677 continue;
678
679 if (page_zone(pfn_to_page(pfn)) != zone)
680 continue;
681
682 /* If the section is current section, it continues the loop */
683 if (start_pfn == pfn)
684 continue;
685
686 /* If we find valid section, we have nothing to do */
687 zone_span_writeunlock(zone);
688 return;
689 }
690
691 /* The zone has no valid section */
692 zone->zone_start_pfn = 0;
693 zone->spanned_pages = 0;
694 zone_span_writeunlock(zone);
695}
696
697static void shrink_pgdat_span(struct pglist_data *pgdat,
698 unsigned long start_pfn, unsigned long end_pfn)
699{
Xishi Qiu83285c72013-11-12 15:07:19 -0800700 unsigned long pgdat_start_pfn = pgdat->node_start_pfn;
701 unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */
702 unsigned long pgdat_end_pfn = p;
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800703 unsigned long pfn;
704 struct mem_section *ms;
705 int nid = pgdat->node_id;
706
707 if (pgdat_start_pfn == start_pfn) {
708 /*
709 * If the section is smallest section in the pgdat, it need
710 * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages.
711 * In this case, we find second smallest valid mem_section
712 * for shrinking zone.
713 */
714 pfn = find_smallest_section_pfn(nid, NULL, end_pfn,
715 pgdat_end_pfn);
716 if (pfn) {
717 pgdat->node_start_pfn = pfn;
718 pgdat->node_spanned_pages = pgdat_end_pfn - pfn;
719 }
720 } else if (pgdat_end_pfn == end_pfn) {
721 /*
722 * If the section is biggest section in the pgdat, it need
723 * shrink pgdat->node_spanned_pages.
724 * In this case, we find second biggest valid mem_section for
725 * shrinking zone.
726 */
727 pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn,
728 start_pfn);
729 if (pfn)
730 pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1;
731 }
732
733 /*
734 * If the section is not biggest or smallest mem_section in the pgdat,
735 * it only creates a hole in the pgdat. So in this case, we need not
736 * change the pgdat.
737 * But perhaps, the pgdat has only hole data. Thus it check the pgdat
738 * has only hole or not.
739 */
740 pfn = pgdat_start_pfn;
741 for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) {
742 ms = __pfn_to_section(pfn);
743
744 if (unlikely(!valid_section(ms)))
745 continue;
746
747 if (pfn_to_nid(pfn) != nid)
748 continue;
749
750 /* If the section is current section, it continues the loop */
751 if (start_pfn == pfn)
752 continue;
753
754 /* If we find valid section, we have nothing to do */
755 return;
756 }
757
758 /* The pgdat has no valid section */
759 pgdat->node_start_pfn = 0;
760 pgdat->node_spanned_pages = 0;
761}
762
763static void __remove_zone(struct zone *zone, unsigned long start_pfn)
764{
765 struct pglist_data *pgdat = zone->zone_pgdat;
766 int nr_pages = PAGES_PER_SECTION;
767 int zone_type;
768 unsigned long flags;
769
770 zone_type = zone - pgdat->node_zones;
771
772 pgdat_resize_lock(zone->zone_pgdat, &flags);
773 shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
774 shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages);
775 pgdat_resize_unlock(zone->zone_pgdat, &flags);
776}
777
Dan Williams4b94ffd2016-01-15 16:56:22 -0800778static int __remove_section(struct zone *zone, struct mem_section *ms,
779 unsigned long map_offset)
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700780{
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800781 unsigned long start_pfn;
782 int scn_nr;
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700783 int ret = -EINVAL;
784
785 if (!valid_section(ms))
786 return ret;
787
788 ret = unregister_memory_section(ms);
789 if (ret)
790 return ret;
791
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800792 scn_nr = __section_nr(ms);
793 start_pfn = section_nr_to_pfn(scn_nr);
794 __remove_zone(zone, start_pfn);
795
Dan Williams4b94ffd2016-01-15 16:56:22 -0800796 sparse_remove_one_section(zone, ms, map_offset);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700797 return 0;
798}
799
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700800/**
801 * __remove_pages() - remove sections of pages from a zone
802 * @zone: zone from which pages need to be removed
803 * @phys_start_pfn: starting pageframe (must be aligned to start of a section)
804 * @nr_pages: number of pages to remove (must be multiple of section size)
805 *
806 * Generic helper function to remove section mappings and sysfs entries
807 * for the section of the memory we are removing. Caller needs to make
808 * sure that pages are marked reserved and zones are adjust properly by
809 * calling offline_pages().
810 */
811int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
812 unsigned long nr_pages)
813{
Toshi Kanife74ebb2013-04-29 15:08:20 -0700814 unsigned long i;
Dan Williams4b94ffd2016-01-15 16:56:22 -0800815 unsigned long map_offset = 0;
816 int sections_to_remove, ret = 0;
817
818 /* In the ZONE_DEVICE case device driver owns the memory region */
819 if (is_dev_zone(zone)) {
820 struct page *page = pfn_to_page(phys_start_pfn);
821 struct vmem_altmap *altmap;
822
823 altmap = to_vmem_altmap((unsigned long) page);
824 if (altmap)
825 map_offset = vmem_altmap_offset(altmap);
826 } else {
827 resource_size_t start, size;
828
829 start = phys_start_pfn << PAGE_SHIFT;
830 size = nr_pages * PAGE_SIZE;
831
832 ret = release_mem_region_adjustable(&iomem_resource, start,
833 size);
834 if (ret) {
835 resource_size_t endres = start + size - 1;
836
837 pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
838 &start, &endres, ret);
839 }
840 }
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700841
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700842 clear_zone_contiguous(zone);
843
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700844 /*
845 * We can only remove entire sections
846 */
847 BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
848 BUG_ON(nr_pages % PAGES_PER_SECTION);
849
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700850 sections_to_remove = nr_pages / PAGES_PER_SECTION;
851 for (i = 0; i < sections_to_remove; i++) {
852 unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
Dan Williams4b94ffd2016-01-15 16:56:22 -0800853
854 ret = __remove_section(zone, __pfn_to_section(pfn), map_offset);
855 map_offset = 0;
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700856 if (ret)
857 break;
858 }
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700859
860 set_zone_contiguous(zone);
861
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700862 return ret;
863}
864EXPORT_SYMBOL_GPL(__remove_pages);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700865#endif /* CONFIG_MEMORY_HOTREMOVE */
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700866
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700867int set_online_page_callback(online_page_callback_t callback)
868{
869 int rc = -EINVAL;
870
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700871 get_online_mems();
872 mutex_lock(&online_page_callback_lock);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700873
874 if (online_page_callback == generic_online_page) {
875 online_page_callback = callback;
876 rc = 0;
877 }
878
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700879 mutex_unlock(&online_page_callback_lock);
880 put_online_mems();
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700881
882 return rc;
883}
884EXPORT_SYMBOL_GPL(set_online_page_callback);
885
886int restore_online_page_callback(online_page_callback_t callback)
887{
888 int rc = -EINVAL;
889
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700890 get_online_mems();
891 mutex_lock(&online_page_callback_lock);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700892
893 if (online_page_callback == callback) {
894 online_page_callback = generic_online_page;
895 rc = 0;
896 }
897
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700898 mutex_unlock(&online_page_callback_lock);
899 put_online_mems();
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700900
901 return rc;
902}
903EXPORT_SYMBOL_GPL(restore_online_page_callback);
904
905void __online_page_set_limits(struct page *page)
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700906{
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700907}
908EXPORT_SYMBOL_GPL(__online_page_set_limits);
909
910void __online_page_increment_counters(struct page *page)
911{
Jiang Liu3dcc0572013-07-03 15:03:21 -0700912 adjust_managed_page_count(page, 1);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700913}
914EXPORT_SYMBOL_GPL(__online_page_increment_counters);
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700915
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700916void __online_page_free(struct page *page)
917{
Jiang Liu3dcc0572013-07-03 15:03:21 -0700918 __free_reserved_page(page);
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700919}
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700920EXPORT_SYMBOL_GPL(__online_page_free);
921
922static void generic_online_page(struct page *page)
923{
924 __online_page_set_limits(page);
925 __online_page_increment_counters(page);
926 __online_page_free(page);
927}
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700928
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700929static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
930 void *arg)
Dave Hansen3947be12005-10-29 18:16:54 -0700931{
932 unsigned long i;
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700933 unsigned long onlined_pages = *(unsigned long *)arg;
934 struct page *page;
935 if (PageReserved(pfn_to_page(start_pfn)))
936 for (i = 0; i < nr_pages; i++) {
937 page = pfn_to_page(start_pfn + i);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700938 (*online_page_callback)(page);
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700939 onlined_pages++;
940 }
941 *(unsigned long *)arg = onlined_pages;
942 return 0;
943}
944
Lai Jiangshan09285af2012-12-12 13:52:04 -0800945#ifdef CONFIG_MOVABLE_NODE
Tang Chen79a4dce2012-12-18 14:23:24 -0800946/*
947 * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have
948 * normal memory.
949 */
Lai Jiangshan09285af2012-12-12 13:52:04 -0800950static bool can_online_high_movable(struct zone *zone)
951{
952 return true;
953}
Tang Chen79a4dce2012-12-18 14:23:24 -0800954#else /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -0800955/* ensure every online node has NORMAL memory */
956static bool can_online_high_movable(struct zone *zone)
957{
958 return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);
959}
Tang Chen79a4dce2012-12-18 14:23:24 -0800960#endif /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -0800961
Lai Jiangshand9713672012-12-11 16:01:03 -0800962/* check which state of node_states will be changed when online memory */
963static void node_states_check_changes_online(unsigned long nr_pages,
964 struct zone *zone, struct memory_notify *arg)
965{
966 int nid = zone_to_nid(zone);
967 enum zone_type zone_last = ZONE_NORMAL;
968
969 /*
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800970 * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
971 * contains nodes which have zones of 0...ZONE_NORMAL,
972 * set zone_last to ZONE_NORMAL.
Lai Jiangshand9713672012-12-11 16:01:03 -0800973 *
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800974 * If we don't have HIGHMEM nor movable node,
975 * node_states[N_NORMAL_MEMORY] contains nodes which have zones of
976 * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
Lai Jiangshand9713672012-12-11 16:01:03 -0800977 */
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800978 if (N_MEMORY == N_NORMAL_MEMORY)
Lai Jiangshand9713672012-12-11 16:01:03 -0800979 zone_last = ZONE_MOVABLE;
980
981 /*
982 * if the memory to be online is in a zone of 0...zone_last, and
983 * the zones of 0...zone_last don't have memory before online, we will
984 * need to set the node to node_states[N_NORMAL_MEMORY] after
985 * the memory is online.
986 */
987 if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY))
988 arg->status_change_nid_normal = nid;
989 else
990 arg->status_change_nid_normal = -1;
991
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800992#ifdef CONFIG_HIGHMEM
993 /*
994 * If we have movable node, node_states[N_HIGH_MEMORY]
995 * contains nodes which have zones of 0...ZONE_HIGHMEM,
996 * set zone_last to ZONE_HIGHMEM.
997 *
998 * If we don't have movable node, node_states[N_NORMAL_MEMORY]
999 * contains nodes which have zones of 0...ZONE_MOVABLE,
1000 * set zone_last to ZONE_MOVABLE.
1001 */
1002 zone_last = ZONE_HIGHMEM;
1003 if (N_MEMORY == N_HIGH_MEMORY)
1004 zone_last = ZONE_MOVABLE;
1005
1006 if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY))
1007 arg->status_change_nid_high = nid;
1008 else
1009 arg->status_change_nid_high = -1;
1010#else
1011 arg->status_change_nid_high = arg->status_change_nid_normal;
1012#endif
1013
Lai Jiangshand9713672012-12-11 16:01:03 -08001014 /*
1015 * if the node don't have memory befor online, we will need to
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001016 * set the node to node_states[N_MEMORY] after the memory
Lai Jiangshand9713672012-12-11 16:01:03 -08001017 * is online.
1018 */
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001019 if (!node_state(nid, N_MEMORY))
Lai Jiangshand9713672012-12-11 16:01:03 -08001020 arg->status_change_nid = nid;
1021 else
1022 arg->status_change_nid = -1;
1023}
1024
1025static void node_states_set_node(int node, struct memory_notify *arg)
1026{
1027 if (arg->status_change_nid_normal >= 0)
1028 node_set_state(node, N_NORMAL_MEMORY);
1029
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001030 if (arg->status_change_nid_high >= 0)
1031 node_set_state(node, N_HIGH_MEMORY);
1032
1033 node_set_state(node, N_MEMORY);
Lai Jiangshand9713672012-12-11 16:01:03 -08001034}
1035
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001036bool zone_can_shift(unsigned long pfn, unsigned long nr_pages,
1037 enum zone_type target, int *zone_shift)
Reza Arbabdf429ac2016-07-26 15:22:23 -07001038{
1039 struct zone *zone = page_zone(pfn_to_page(pfn));
1040 enum zone_type idx = zone_idx(zone);
1041 int i;
1042
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001043 *zone_shift = 0;
1044
Reza Arbabdf429ac2016-07-26 15:22:23 -07001045 if (idx < target) {
1046 /* pages must be at end of current zone */
1047 if (pfn + nr_pages != zone_end_pfn(zone))
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001048 return false;
Reza Arbabdf429ac2016-07-26 15:22:23 -07001049
1050 /* no zones in use between current zone and target */
1051 for (i = idx + 1; i < target; i++)
1052 if (zone_is_initialized(zone - idx + i))
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001053 return false;
Reza Arbabdf429ac2016-07-26 15:22:23 -07001054 }
1055
1056 if (target < idx) {
1057 /* pages must be at beginning of current zone */
1058 if (pfn != zone->zone_start_pfn)
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001059 return false;
Reza Arbabdf429ac2016-07-26 15:22:23 -07001060
1061 /* no zones in use between current zone and target */
1062 for (i = target + 1; i < idx; i++)
1063 if (zone_is_initialized(zone - idx + i))
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001064 return false;
Reza Arbabdf429ac2016-07-26 15:22:23 -07001065 }
1066
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001067 *zone_shift = target - idx;
1068 return true;
Reza Arbabdf429ac2016-07-26 15:22:23 -07001069}
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -07001070
David Rientjes30467e02015-04-14 15:45:11 -07001071/* Must be protected by mem_hotplug_begin() */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -08001072int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type)
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -07001073{
Cody P Schaferaa472282013-07-03 15:02:10 -07001074 unsigned long flags;
Dave Hansen3947be12005-10-29 18:16:54 -07001075 unsigned long onlined_pages = 0;
1076 struct zone *zone;
Yasunori Goto68113782006-06-23 02:03:11 -07001077 int need_zonelists_rebuild = 0;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001078 int nid;
1079 int ret;
1080 struct memory_notify arg;
Reza Arbabe51e6c82016-07-26 15:22:20 -07001081 int zone_shift = 0;
Dave Hansen3947be12005-10-29 18:16:54 -07001082
Lai Jiangshand9713672012-12-11 16:01:03 -08001083 /*
1084 * This doesn't need a lock to do pfn_to_page().
1085 * The section can't be removed here because of the
1086 * memory_block->state_mutex.
1087 */
1088 zone = page_zone(pfn_to_page(pfn));
1089
Tang Chen4f7c6b42014-08-06 16:05:13 -07001090 if ((zone_idx(zone) > ZONE_NORMAL ||
1091 online_type == MMOP_ONLINE_MOVABLE) &&
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07001092 !can_online_high_movable(zone))
David Rientjes30467e02015-04-14 15:45:11 -07001093 return -EINVAL;
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001094
Yasuaki Ishimatsu8a1f7802017-01-24 15:17:45 -08001095 if (online_type == MMOP_ONLINE_KERNEL) {
1096 if (!zone_can_shift(pfn, nr_pages, ZONE_NORMAL, &zone_shift))
1097 return -EINVAL;
1098 } else if (online_type == MMOP_ONLINE_MOVABLE) {
1099 if (!zone_can_shift(pfn, nr_pages, ZONE_MOVABLE, &zone_shift))
1100 return -EINVAL;
1101 }
Reza Arbabe51e6c82016-07-26 15:22:20 -07001102
1103 zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages);
1104 if (!zone)
1105 return -EINVAL;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -08001106
Yasunori Goto7b78d332007-10-21 16:41:36 -07001107 arg.start_pfn = pfn;
1108 arg.nr_pages = nr_pages;
Lai Jiangshand9713672012-12-11 16:01:03 -08001109 node_states_check_changes_online(nr_pages, zone, &arg);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001110
Vlastimil Babkae888ca32016-03-17 14:18:12 -07001111 nid = zone_to_nid(zone);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001112
1113 ret = memory_notify(MEM_GOING_ONLINE, &arg);
1114 ret = notifier_to_errno(ret);
Chen Yuconge33e33b2016-03-17 14:19:35 -07001115 if (ret)
1116 goto failed_addition;
1117
Dave Hansen3947be12005-10-29 18:16:54 -07001118 /*
Yasunori Goto68113782006-06-23 02:03:11 -07001119 * If this zone is not populated, then it is not in zonelist.
1120 * This means the page allocator ignores this zone.
1121 * So, zonelist must be updated after online.
1122 */
Haicheng Li4eaf3f62010-05-24 14:32:52 -07001123 mutex_lock(&zonelists_mutex);
Wen Congyang6dcd73d2012-12-11 16:01:01 -08001124 if (!populated_zone(zone)) {
Yasunori Goto68113782006-06-23 02:03:11 -07001125 need_zonelists_rebuild = 1;
Wen Congyang6dcd73d2012-12-11 16:01:01 -08001126 build_all_zonelists(NULL, zone);
1127 }
Yasunori Goto68113782006-06-23 02:03:11 -07001128
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -07001129 ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -07001130 online_pages_range);
Geoff Levandfd8a4222008-05-14 16:05:50 -07001131 if (ret) {
Wen Congyang6dcd73d2012-12-11 16:01:01 -08001132 if (need_zonelists_rebuild)
1133 zone_pcp_reset(zone);
Haicheng Li4eaf3f62010-05-24 14:32:52 -07001134 mutex_unlock(&zonelists_mutex);
Chen Yuconge33e33b2016-03-17 14:19:35 -07001135 goto failed_addition;
Geoff Levandfd8a4222008-05-14 16:05:50 -07001136 }
1137
Dave Hansen3947be12005-10-29 18:16:54 -07001138 zone->present_pages += onlined_pages;
Cody P Schaferaa472282013-07-03 15:02:10 -07001139
1140 pgdat_resize_lock(zone->zone_pgdat, &flags);
Yasunori Gotof2937be2006-03-09 17:33:51 -08001141 zone->zone_pgdat->node_present_pages += onlined_pages;
Cody P Schaferaa472282013-07-03 15:02:10 -07001142 pgdat_resize_unlock(zone->zone_pgdat, &flags);
1143
Jiang Liu08dff7b2012-07-31 16:43:30 -07001144 if (onlined_pages) {
Vlastimil Babkae888ca32016-03-17 14:18:12 -07001145 node_states_set_node(nid, &arg);
Jiang Liu08dff7b2012-07-31 16:43:30 -07001146 if (need_zonelists_rebuild)
Wen Congyang6dcd73d2012-12-11 16:01:01 -08001147 build_all_zonelists(NULL, NULL);
Jiang Liu08dff7b2012-07-31 16:43:30 -07001148 else
1149 zone_pcp_update(zone);
1150 }
Dave Hansen3947be12005-10-29 18:16:54 -07001151
Haicheng Li4eaf3f62010-05-24 14:32:52 -07001152 mutex_unlock(&zonelists_mutex);
KOSAKI Motohiro1b79acc2011-05-24 17:11:32 -07001153
1154 init_per_zone_wmark_min();
1155
Vlastimil Babka698b1b32016-03-17 14:18:08 -07001156 if (onlined_pages) {
Vlastimil Babkae888ca32016-03-17 14:18:12 -07001157 kswapd_run(nid);
Vlastimil Babka698b1b32016-03-17 14:18:08 -07001158 kcompactd_run(nid);
1159 }
Dave Hansen61b13992005-10-29 18:16:56 -07001160
Haicheng Li1f522502010-05-24 14:32:51 -07001161 vm_total_pages = nr_free_pagecache_pages();
Kent Liu2f7f24e2008-07-23 21:28:18 -07001162
Chandra Seetharaman2d1d43f2006-09-29 02:01:25 -07001163 writeback_set_ratelimit();
Yasunori Goto7b78d332007-10-21 16:41:36 -07001164
1165 if (onlined_pages)
1166 memory_notify(MEM_ONLINE, &arg);
David Rientjes30467e02015-04-14 15:45:11 -07001167 return 0;
Chen Yuconge33e33b2016-03-17 14:19:35 -07001168
1169failed_addition:
1170 pr_debug("online_pages [mem %#010llx-%#010llx] failed\n",
1171 (unsigned long long) pfn << PAGE_SHIFT,
1172 (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1);
1173 memory_notify(MEM_CANCEL_ONLINE, &arg);
1174 return ret;
Dave Hansen3947be12005-10-29 18:16:54 -07001175}
Keith Mannthey53947022006-09-30 23:27:08 -07001176#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
Yasunori Gotobc02af92006-06-27 02:53:30 -07001177
Tang Chen0bd85422014-11-13 15:19:41 -08001178static void reset_node_present_pages(pg_data_t *pgdat)
1179{
1180 struct zone *z;
1181
1182 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
1183 z->present_pages = 0;
1184
1185 pgdat->node_present_pages = 0;
1186}
1187
Hidetoshi Setoe1319332009-11-17 14:06:18 -08001188/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
1189static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001190{
1191 struct pglist_data *pgdat;
1192 unsigned long zones_size[MAX_NR_ZONES] = {0};
1193 unsigned long zholes_size[MAX_NR_ZONES] = {0};
Fabian Frederickc8e861a2014-06-04 16:07:51 -07001194 unsigned long start_pfn = PFN_DOWN(start);
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001195
Tang Chena1e565a2013-02-22 16:33:18 -08001196 pgdat = NODE_DATA(nid);
1197 if (!pgdat) {
1198 pgdat = arch_alloc_nodedata(nid);
1199 if (!pgdat)
1200 return NULL;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001201
Tang Chena1e565a2013-02-22 16:33:18 -08001202 arch_refresh_nodedata(nid, pgdat);
Gu Zhengb0dc3a32015-03-25 15:55:20 -07001203 } else {
Mel Gorman38087d92016-07-28 15:45:49 -07001204 /* Reset the nr_zones, order and classzone_idx before reuse */
Gu Zhengb0dc3a32015-03-25 15:55:20 -07001205 pgdat->nr_zones = 0;
Mel Gorman38087d92016-07-28 15:45:49 -07001206 pgdat->kswapd_order = 0;
1207 pgdat->kswapd_classzone_idx = 0;
Tang Chena1e565a2013-02-22 16:33:18 -08001208 }
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001209
1210 /* we can use NODE_DATA(nid) from here */
1211
1212 /* init node's zones as empty zones, we don't have any present pages.*/
Johannes Weiner9109fb72008-07-23 21:27:20 -07001213 free_area_init_node(nid, zones_size, start_pfn, zholes_size);
Reza Arbab58301692016-08-11 15:33:12 -07001214 pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat);
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001215
KAMEZAWA Hiroyuki959ecc42011-06-15 15:08:38 -07001216 /*
1217 * The node we allocated has no zone fallback lists. For avoiding
1218 * to access not-initialized zonelist, build here.
1219 */
David Rientjesf957db42011-06-22 18:13:04 -07001220 mutex_lock(&zonelists_mutex);
Jiang Liu9adb62a2012-07-31 16:43:28 -07001221 build_all_zonelists(pgdat, NULL);
David Rientjesf957db42011-06-22 18:13:04 -07001222 mutex_unlock(&zonelists_mutex);
KAMEZAWA Hiroyuki959ecc42011-06-15 15:08:38 -07001223
Tang Chenf784a3f2014-11-13 15:19:39 -08001224 /*
1225 * zone->managed_pages is set to an approximate value in
1226 * free_area_init_core(), which will cause
1227 * /sys/device/system/node/nodeX/meminfo has wrong data.
1228 * So reset it to 0 before any memory is onlined.
1229 */
1230 reset_node_managed_pages(pgdat);
1231
Tang Chen0bd85422014-11-13 15:19:41 -08001232 /*
1233 * When memory is hot-added, all the memory is in offline state. So
1234 * clear all zones' present_pages because they will be updated in
1235 * online_pages() and offline_pages().
1236 */
1237 reset_node_present_pages(pgdat);
1238
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001239 return pgdat;
1240}
1241
1242static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
1243{
1244 arch_refresh_nodedata(nid, NULL);
Reza Arbab58301692016-08-11 15:33:12 -07001245 free_percpu(pgdat->per_cpu_nodestats);
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001246 arch_free_nodedata(pgdat);
1247 return;
1248}
1249
KAMEZAWA Hiroyuki0a547032006-06-27 02:53:35 -07001250
Toshi Kani01b0f192013-11-12 15:07:25 -08001251/**
1252 * try_online_node - online a node if offlined
1253 *
minskey guocf234222010-05-24 14:32:41 -07001254 * called by cpu_up() to online a node without onlined memory.
1255 */
Toshi Kani01b0f192013-11-12 15:07:25 -08001256int try_online_node(int nid)
minskey guocf234222010-05-24 14:32:41 -07001257{
1258 pg_data_t *pgdat;
1259 int ret;
1260
Toshi Kani01b0f192013-11-12 15:07:25 -08001261 if (node_online(nid))
1262 return 0;
1263
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07001264 mem_hotplug_begin();
minskey guocf234222010-05-24 14:32:41 -07001265 pgdat = hotadd_new_pgdat(nid, 0);
David Rientjes7553e8f2011-06-22 18:13:01 -07001266 if (!pgdat) {
Toshi Kani01b0f192013-11-12 15:07:25 -08001267 pr_err("Cannot online node %d due to NULL pgdat\n", nid);
minskey guocf234222010-05-24 14:32:41 -07001268 ret = -ENOMEM;
1269 goto out;
1270 }
1271 node_set_online(nid);
1272 ret = register_one_node(nid);
1273 BUG_ON(ret);
1274
Toshi Kani01b0f192013-11-12 15:07:25 -08001275 if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
1276 mutex_lock(&zonelists_mutex);
1277 build_all_zonelists(NULL, NULL);
1278 mutex_unlock(&zonelists_mutex);
1279 }
1280
minskey guocf234222010-05-24 14:32:41 -07001281out:
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07001282 mem_hotplug_done();
minskey guocf234222010-05-24 14:32:41 -07001283 return ret;
1284}
1285
Toshi Kani27356f52013-09-11 14:21:49 -07001286static int check_hotplug_memory_range(u64 start, u64 size)
1287{
Fabian Frederickc8e861a2014-06-04 16:07:51 -07001288 u64 start_pfn = PFN_DOWN(start);
Toshi Kani27356f52013-09-11 14:21:49 -07001289 u64 nr_pages = size >> PAGE_SHIFT;
1290
1291 /* Memory range must be aligned with section */
1292 if ((start_pfn & ~PAGE_SECTION_MASK) ||
1293 (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) {
1294 pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n",
1295 (unsigned long long)start,
1296 (unsigned long long)size);
1297 return -EINVAL;
1298 }
1299
1300 return 0;
1301}
1302
Wang Nan63264402014-08-06 16:07:36 -07001303/*
1304 * If movable zone has already been setup, newly added memory should be check.
1305 * If its address is higher than movable zone, it should be added as movable.
1306 * Without this check, movable zone may overlap with other zone.
1307 */
1308static int should_add_memory_movable(int nid, u64 start, u64 size)
1309{
1310 unsigned long start_pfn = start >> PAGE_SHIFT;
1311 pg_data_t *pgdat = NODE_DATA(nid);
1312 struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
1313
1314 if (zone_is_empty(movable_zone))
1315 return 0;
1316
1317 if (movable_zone->zone_start_pfn <= start_pfn)
1318 return 1;
1319
1320 return 0;
1321}
1322
Dan Williams033fbae2015-08-09 15:29:06 -04001323int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
1324 bool for_device)
Wang Nan63264402014-08-06 16:07:36 -07001325{
Dan Williams033fbae2015-08-09 15:29:06 -04001326#ifdef CONFIG_ZONE_DEVICE
1327 if (for_device)
1328 return ZONE_DEVICE;
1329#endif
Wang Nan63264402014-08-06 16:07:36 -07001330 if (should_add_memory_movable(nid, start, size))
1331 return ZONE_MOVABLE;
1332
1333 return zone_default;
1334}
1335
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -07001336static int online_memory_block(struct memory_block *mem, void *arg)
1337{
1338 return memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
1339}
1340
Al Viro31168482008-11-22 17:33:24 +00001341/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -07001342int __ref add_memory_resource(int nid, struct resource *res, bool online)
Yasunori Gotobc02af92006-06-27 02:53:30 -07001343{
David Vrabel62cedb92015-06-25 16:35:49 +01001344 u64 start, size;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001345 pg_data_t *pgdat = NULL;
Tang Chena1e565a2013-02-22 16:33:18 -08001346 bool new_pgdat;
1347 bool new_node;
Yasunori Gotobc02af92006-06-27 02:53:30 -07001348 int ret;
1349
David Vrabel62cedb92015-06-25 16:35:49 +01001350 start = res->start;
1351 size = resource_size(res);
1352
Toshi Kani27356f52013-09-11 14:21:49 -07001353 ret = check_hotplug_memory_range(start, size);
1354 if (ret)
1355 return ret;
1356
Tang Chena1e565a2013-02-22 16:33:18 -08001357 { /* Stupid hack to suppress address-never-null warning */
1358 void *p = NODE_DATA(nid);
1359 new_pgdat = !p;
1360 }
Nathan Zimmerac13c462014-01-23 15:53:26 -08001361
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07001362 mem_hotplug_begin();
Nathan Zimmerac13c462014-01-23 15:53:26 -08001363
Tang Chen7f36e3e2015-09-04 15:42:32 -07001364 /*
1365 * Add new range to memblock so that when hotadd_new_pgdat() is called
1366 * to allocate new pgdat, get_pfn_range_for_nid() will be able to find
1367 * this new range and calculate total pages correctly. The range will
1368 * be removed at hot-remove time.
1369 */
1370 memblock_add_node(start, size, nid);
1371
Tang Chena1e565a2013-02-22 16:33:18 -08001372 new_node = !node_online(nid);
1373 if (new_node) {
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001374 pgdat = hotadd_new_pgdat(nid, start);
Andi Kleen6ad696d2009-11-17 14:06:22 -08001375 ret = -ENOMEM;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001376 if (!pgdat)
Wen Congyang41b9e2d2012-07-11 14:02:31 -07001377 goto error;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001378 }
1379
Yasunori Gotobc02af92006-06-27 02:53:30 -07001380 /* call arch's memory hotadd */
Dan Williams033fbae2015-08-09 15:29:06 -04001381 ret = arch_add_memory(nid, start, size, false);
Yasunori Gotobc02af92006-06-27 02:53:30 -07001382
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001383 if (ret < 0)
1384 goto error;
1385
Yasunori Goto0fc44152006-06-27 02:53:38 -07001386 /* we online node here. we can't roll back from here. */
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001387 node_set_online(nid);
1388
Tang Chena1e565a2013-02-22 16:33:18 -08001389 if (new_node) {
Yasunori Goto0fc44152006-06-27 02:53:38 -07001390 ret = register_one_node(nid);
1391 /*
1392 * If sysfs file of new node can't create, cpu on the node
1393 * can't be hot-added. There is no rollback way now.
1394 * So, check by BUG_ON() to catch it reluctantly..
1395 */
1396 BUG_ON(ret);
1397 }
1398
akpm@linux-foundation.orgd96ae532010-03-05 13:41:58 -08001399 /* create new memmap entry */
1400 firmware_map_add_hotplug(start, start + size, "System RAM");
1401
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -07001402 /* online pages if requested */
1403 if (online)
1404 walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1),
1405 NULL, online_memory_block);
1406
Andi Kleen6ad696d2009-11-17 14:06:22 -08001407 goto out;
1408
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001409error:
1410 /* rollback pgdat allocation and others */
1411 if (new_pgdat)
1412 rollback_node_hotadd(nid, pgdat);
Tang Chen7f36e3e2015-09-04 15:42:32 -07001413 memblock_remove(start, size);
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001414
Andi Kleen6ad696d2009-11-17 14:06:22 -08001415out:
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07001416 mem_hotplug_done();
Yasunori Gotobc02af92006-06-27 02:53:30 -07001417 return ret;
1418}
David Vrabel62cedb92015-06-25 16:35:49 +01001419EXPORT_SYMBOL_GPL(add_memory_resource);
1420
1421int __ref add_memory(int nid, u64 start, u64 size)
1422{
1423 struct resource *res;
1424 int ret;
1425
1426 res = register_memory_resource(start, size);
Vitaly Kuznetsov6f754ba2016-01-14 15:21:55 -08001427 if (IS_ERR(res))
1428 return PTR_ERR(res);
David Vrabel62cedb92015-06-25 16:35:49 +01001429
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -07001430 ret = add_memory_resource(nid, res, memhp_auto_online);
David Vrabel62cedb92015-06-25 16:35:49 +01001431 if (ret < 0)
1432 release_memory_resource(res);
1433 return ret;
1434}
Yasunori Gotobc02af92006-06-27 02:53:30 -07001435EXPORT_SYMBOL_GPL(add_memory);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001436
1437#ifdef CONFIG_MEMORY_HOTREMOVE
1438/*
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001439 * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy
1440 * set and the size of the free page is given by page_order(). Using this,
1441 * the function determines if the pageblock contains only free pages.
1442 * Due to buddy contraints, a free page at least the size of a pageblock will
1443 * be located at the start of the pageblock
1444 */
1445static inline int pageblock_free(struct page *page)
1446{
1447 return PageBuddy(page) && page_order(page) >= pageblock_order;
1448}
1449
1450/* Return the start of the next active pageblock after a given page */
1451static struct page *next_active_pageblock(struct page *page)
1452{
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001453 /* Ensure the starting page is pageblock-aligned */
1454 BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1));
1455
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001456 /* If the entire pageblock is free, move to the end of free page */
KAMEZAWA Hiroyuki0dcc48c2010-09-09 16:38:01 -07001457 if (pageblock_free(page)) {
1458 int order;
1459 /* be careful. we don't have locks, page_order can be changed.*/
1460 order = page_order(page);
1461 if ((order < MAX_ORDER) && (order >= pageblock_order))
1462 return page + (1 << order);
1463 }
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001464
KAMEZAWA Hiroyuki0dcc48c2010-09-09 16:38:01 -07001465 return page + pageblock_nr_pages;
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001466}
1467
1468/* Checks if this range of memory is likely to be hot-removable. */
Yaowei Baic98940f2016-05-19 17:11:26 -07001469bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001470{
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001471 struct page *page = pfn_to_page(start_pfn);
1472 struct page *end_page = page + nr_pages;
1473
1474 /* Check the starting page of each pageblock within the range */
1475 for (; page < end_page; page = next_active_pageblock(page)) {
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -07001476 if (!is_pageblock_removable_nolock(page))
Yaowei Baic98940f2016-05-19 17:11:26 -07001477 return false;
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -07001478 cond_resched();
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001479 }
1480
1481 /* All pageblocks in the memory block are likely to be hot-removable */
Yaowei Baic98940f2016-05-19 17:11:26 -07001482 return true;
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001483}
1484
1485/*
Toshi Kanideb88a22017-02-03 13:13:20 -08001486 * Confirm all pages in a range [start, end) belong to the same zone.
Toshi Kania96dfdd2017-02-03 13:13:23 -08001487 * When true, return its valid [start, end).
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001488 */
Toshi Kania96dfdd2017-02-03 13:13:23 -08001489int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
1490 unsigned long *valid_start, unsigned long *valid_end)
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001491{
Andrew Banman5f0f2882015-12-29 14:54:25 -08001492 unsigned long pfn, sec_end_pfn;
Toshi Kania96dfdd2017-02-03 13:13:23 -08001493 unsigned long start, end;
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001494 struct zone *zone = NULL;
1495 struct page *page;
1496 int i;
Toshi Kanideb88a22017-02-03 13:13:20 -08001497 for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001498 pfn < end_pfn;
Toshi Kanideb88a22017-02-03 13:13:20 -08001499 pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) {
Andrew Banman5f0f2882015-12-29 14:54:25 -08001500 /* Make sure the memory section is present first */
1501 if (!present_section_nr(pfn_to_section_nr(pfn)))
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001502 continue;
Andrew Banman5f0f2882015-12-29 14:54:25 -08001503 for (; pfn < sec_end_pfn && pfn < end_pfn;
1504 pfn += MAX_ORDER_NR_PAGES) {
1505 i = 0;
1506 /* This is just a CONFIG_HOLES_IN_ZONE check.*/
1507 while ((i < MAX_ORDER_NR_PAGES) &&
1508 !pfn_valid_within(pfn + i))
1509 i++;
1510 if (i == MAX_ORDER_NR_PAGES)
1511 continue;
1512 page = pfn_to_page(pfn + i);
1513 if (zone && page_zone(page) != zone)
1514 return 0;
Toshi Kania96dfdd2017-02-03 13:13:23 -08001515 if (!zone)
1516 start = pfn + i;
Andrew Banman5f0f2882015-12-29 14:54:25 -08001517 zone = page_zone(page);
Toshi Kania96dfdd2017-02-03 13:13:23 -08001518 end = pfn + MAX_ORDER_NR_PAGES;
Andrew Banman5f0f2882015-12-29 14:54:25 -08001519 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001520 }
Toshi Kanideb88a22017-02-03 13:13:20 -08001521
Toshi Kania96dfdd2017-02-03 13:13:23 -08001522 if (zone) {
1523 *valid_start = start;
1524 *valid_end = end;
Toshi Kanideb88a22017-02-03 13:13:20 -08001525 return 1;
Toshi Kania96dfdd2017-02-03 13:13:23 -08001526 } else {
Toshi Kanideb88a22017-02-03 13:13:20 -08001527 return 0;
Toshi Kania96dfdd2017-02-03 13:13:23 -08001528 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001529}
1530
1531/*
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001532 * Scan pfn range [start,end) to find movable/migratable pages (LRU pages
1533 * and hugepages). We scan pfn because it's much easier than scanning over
1534 * linked list. This function returns the pfn of the first found movable
1535 * page if it's found, otherwise 0.
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001536 */
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001537static unsigned long scan_movable_pages(unsigned long start, unsigned long end)
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001538{
1539 unsigned long pfn;
1540 struct page *page;
1541 for (pfn = start; pfn < end; pfn++) {
1542 if (pfn_valid(pfn)) {
1543 page = pfn_to_page(pfn);
1544 if (PageLRU(page))
1545 return pfn;
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001546 if (PageHuge(page)) {
Naoya Horiguchi7e1f0492015-04-15 16:14:41 -07001547 if (page_huge_active(page))
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001548 return pfn;
1549 else
1550 pfn = round_up(pfn + 1,
1551 1 << compound_order(page)) - 1;
1552 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001553 }
1554 }
1555 return 0;
1556}
1557
Xishi Qiu394e31d2016-07-28 15:48:53 -07001558static struct page *new_node_page(struct page *page, unsigned long private,
1559 int **result)
1560{
1561 gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
1562 int nid = page_to_nid(page);
Li Zhong231e97e2016-09-28 15:22:38 -07001563 nodemask_t nmask = node_states[N_MEMORY];
1564 struct page *new_page = NULL;
Xishi Qiu394e31d2016-07-28 15:48:53 -07001565
1566 /*
1567 * TODO: allocate a destination hugepage from a nearest neighbor node,
1568 * accordance with memory policy of the user process if possible. For
1569 * now as a simple work-around, we use the next node for destination.
1570 */
1571 if (PageHuge(page))
1572 return alloc_huge_page_node(page_hstate(compound_head(page)),
1573 next_node_in(nid, nmask));
1574
Li Zhong231e97e2016-09-28 15:22:38 -07001575 node_clear(nid, nmask);
Li Zhong9bb627b2016-09-19 14:43:52 -07001576
Xishi Qiu394e31d2016-07-28 15:48:53 -07001577 if (PageHighMem(page)
1578 || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
1579 gfp_mask |= __GFP_HIGHMEM;
1580
Li Zhong231e97e2016-09-28 15:22:38 -07001581 if (!nodes_empty(nmask))
1582 new_page = __alloc_pages_nodemask(gfp_mask, 0,
Xishi Qiu394e31d2016-07-28 15:48:53 -07001583 node_zonelist(nid, gfp_mask), &nmask);
1584 if (!new_page)
1585 new_page = __alloc_pages(gfp_mask, 0,
1586 node_zonelist(nid, gfp_mask));
1587
1588 return new_page;
1589}
1590
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001591#define NR_OFFLINE_AT_ONCE_PAGES (256)
1592static int
1593do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
1594{
1595 unsigned long pfn;
1596 struct page *page;
1597 int move_pages = NR_OFFLINE_AT_ONCE_PAGES;
1598 int not_managed = 0;
1599 int ret = 0;
1600 LIST_HEAD(source);
1601
1602 for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) {
1603 if (!pfn_valid(pfn))
1604 continue;
1605 page = pfn_to_page(pfn);
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001606
1607 if (PageHuge(page)) {
1608 struct page *head = compound_head(page);
1609 pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1;
1610 if (compound_order(head) > PFN_SECTION_SHIFT) {
1611 ret = -EBUSY;
1612 break;
1613 }
1614 if (isolate_huge_page(page, &source))
1615 move_pages -= 1 << compound_order(head);
1616 continue;
1617 }
1618
Konstantin Khlebnikov700c2a42011-05-24 17:12:19 -07001619 if (!get_page_unless_zero(page))
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001620 continue;
1621 /*
1622 * We can skip free pages. And we can only deal with pages on
1623 * LRU.
1624 */
Nick Piggin62695a82008-10-18 20:26:09 -07001625 ret = isolate_lru_page(page);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001626 if (!ret) { /* Success */
Konstantin Khlebnikov700c2a42011-05-24 17:12:19 -07001627 put_page(page);
Nick Piggin62695a82008-10-18 20:26:09 -07001628 list_add_tail(&page->lru, &source);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001629 move_pages--;
Mel Gorman599d0c92016-07-28 15:45:31 -07001630 inc_node_page_state(page, NR_ISOLATED_ANON +
KOSAKI Motohiro6d9c2852009-12-14 17:58:11 -08001631 page_is_file_cache(page));
1632
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001633 } else {
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001634#ifdef CONFIG_DEBUG_VM
Chen Yuconge33e33b2016-03-17 14:19:35 -07001635 pr_alert("removing pfn %lx from LRU failed\n", pfn);
Dave Hansenf0b791a2014-01-23 15:52:49 -08001636 dump_page(page, "failed to remove from LRU");
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001637#endif
Konstantin Khlebnikov700c2a42011-05-24 17:12:19 -07001638 put_page(page);
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001639 /* Because we don't have big zone->lock. we should
Bob Liu809c4442010-10-26 14:22:10 -07001640 check this again here. */
1641 if (page_count(page)) {
1642 not_managed++;
Bob Liuf3ab2632010-10-26 14:22:10 -07001643 ret = -EBUSY;
Bob Liu809c4442010-10-26 14:22:10 -07001644 break;
1645 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001646 }
1647 }
Bob Liuf3ab2632010-10-26 14:22:10 -07001648 if (!list_empty(&source)) {
1649 if (not_managed) {
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001650 putback_movable_pages(&source);
Bob Liuf3ab2632010-10-26 14:22:10 -07001651 goto out;
1652 }
Minchan Kim74c08f92012-10-08 16:32:54 -07001653
Xishi Qiu394e31d2016-07-28 15:48:53 -07001654 /* Allocate a new page from the nearest neighbor node */
1655 ret = migrate_pages(&source, new_node_page, NULL, 0,
Hugh Dickins9c620e22013-02-22 16:35:14 -08001656 MIGRATE_SYNC, MR_MEMORY_HOTPLUG);
Bob Liuf3ab2632010-10-26 14:22:10 -07001657 if (ret)
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001658 putback_movable_pages(&source);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001659 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001660out:
1661 return ret;
1662}
1663
1664/*
1665 * remove from free_area[] and mark all as Reserved.
1666 */
1667static int
1668offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages,
1669 void *data)
1670{
1671 __offline_isolated_pages(start, start + nr_pages);
1672 return 0;
1673}
1674
1675static void
1676offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
1677{
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -07001678 walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001679 offline_isolated_pages_cb);
1680}
1681
1682/*
1683 * Check all pages in range, recoreded as memory resource, are isolated.
1684 */
1685static int
1686check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages,
1687 void *data)
1688{
1689 int ret;
1690 long offlined = *(long *)data;
Wen Congyangb023f462012-12-11 16:00:45 -08001691 ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001692 offlined = nr_pages;
1693 if (!ret)
1694 *(long *)data += offlined;
1695 return ret;
1696}
1697
1698static long
1699check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
1700{
1701 long offlined = 0;
1702 int ret;
1703
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -07001704 ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001705 check_pages_isolated_cb);
1706 if (ret < 0)
1707 offlined = (long)ret;
1708 return offlined;
1709}
1710
Lai Jiangshan09285af2012-12-12 13:52:04 -08001711#ifdef CONFIG_MOVABLE_NODE
Tang Chen79a4dce2012-12-18 14:23:24 -08001712/*
1713 * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have
1714 * normal memory.
1715 */
Lai Jiangshan09285af2012-12-12 13:52:04 -08001716static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
1717{
1718 return true;
1719}
Tang Chen79a4dce2012-12-18 14:23:24 -08001720#else /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001721/* ensure the node has NORMAL memory if it is still online */
1722static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
1723{
1724 struct pglist_data *pgdat = zone->zone_pgdat;
1725 unsigned long present_pages = 0;
1726 enum zone_type zt;
1727
1728 for (zt = 0; zt <= ZONE_NORMAL; zt++)
1729 present_pages += pgdat->node_zones[zt].present_pages;
1730
1731 if (present_pages > nr_pages)
1732 return true;
1733
1734 present_pages = 0;
1735 for (; zt <= ZONE_MOVABLE; zt++)
1736 present_pages += pgdat->node_zones[zt].present_pages;
1737
1738 /*
1739 * we can't offline the last normal memory until all
1740 * higher memory is offlined.
1741 */
1742 return present_pages == 0;
1743}
Tang Chen79a4dce2012-12-18 14:23:24 -08001744#endif /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001745
Tang Chenc5320922013-11-12 15:08:10 -08001746static int __init cmdline_parse_movable_node(char *p)
1747{
1748#ifdef CONFIG_MOVABLE_NODE
Tang Chen55ac5902014-01-21 15:49:35 -08001749 movable_node_enabled = true;
Tang Chenc5320922013-11-12 15:08:10 -08001750#else
1751 pr_warn("movable_node option not supported\n");
1752#endif
1753 return 0;
1754}
1755early_param("movable_node", cmdline_parse_movable_node);
1756
Lai Jiangshand9713672012-12-11 16:01:03 -08001757/* check which state of node_states will be changed when offline memory */
1758static void node_states_check_changes_offline(unsigned long nr_pages,
1759 struct zone *zone, struct memory_notify *arg)
1760{
1761 struct pglist_data *pgdat = zone->zone_pgdat;
1762 unsigned long present_pages = 0;
1763 enum zone_type zt, zone_last = ZONE_NORMAL;
1764
1765 /*
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001766 * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
1767 * contains nodes which have zones of 0...ZONE_NORMAL,
1768 * set zone_last to ZONE_NORMAL.
Lai Jiangshand9713672012-12-11 16:01:03 -08001769 *
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001770 * If we don't have HIGHMEM nor movable node,
1771 * node_states[N_NORMAL_MEMORY] contains nodes which have zones of
1772 * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
Lai Jiangshand9713672012-12-11 16:01:03 -08001773 */
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001774 if (N_MEMORY == N_NORMAL_MEMORY)
Lai Jiangshand9713672012-12-11 16:01:03 -08001775 zone_last = ZONE_MOVABLE;
1776
1777 /*
1778 * check whether node_states[N_NORMAL_MEMORY] will be changed.
1779 * If the memory to be offline is in a zone of 0...zone_last,
1780 * and it is the last present memory, 0...zone_last will
1781 * become empty after offline , thus we can determind we will
1782 * need to clear the node from node_states[N_NORMAL_MEMORY].
1783 */
1784 for (zt = 0; zt <= zone_last; zt++)
1785 present_pages += pgdat->node_zones[zt].present_pages;
1786 if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
1787 arg->status_change_nid_normal = zone_to_nid(zone);
1788 else
1789 arg->status_change_nid_normal = -1;
1790
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001791#ifdef CONFIG_HIGHMEM
1792 /*
1793 * If we have movable node, node_states[N_HIGH_MEMORY]
1794 * contains nodes which have zones of 0...ZONE_HIGHMEM,
1795 * set zone_last to ZONE_HIGHMEM.
1796 *
1797 * If we don't have movable node, node_states[N_NORMAL_MEMORY]
1798 * contains nodes which have zones of 0...ZONE_MOVABLE,
1799 * set zone_last to ZONE_MOVABLE.
1800 */
1801 zone_last = ZONE_HIGHMEM;
1802 if (N_MEMORY == N_HIGH_MEMORY)
1803 zone_last = ZONE_MOVABLE;
1804
1805 for (; zt <= zone_last; zt++)
1806 present_pages += pgdat->node_zones[zt].present_pages;
1807 if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
1808 arg->status_change_nid_high = zone_to_nid(zone);
1809 else
1810 arg->status_change_nid_high = -1;
1811#else
1812 arg->status_change_nid_high = arg->status_change_nid_normal;
1813#endif
1814
Lai Jiangshand9713672012-12-11 16:01:03 -08001815 /*
1816 * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE
1817 */
1818 zone_last = ZONE_MOVABLE;
1819
1820 /*
1821 * check whether node_states[N_HIGH_MEMORY] will be changed
1822 * If we try to offline the last present @nr_pages from the node,
1823 * we can determind we will need to clear the node from
1824 * node_states[N_HIGH_MEMORY].
1825 */
1826 for (; zt <= zone_last; zt++)
1827 present_pages += pgdat->node_zones[zt].present_pages;
1828 if (nr_pages >= present_pages)
1829 arg->status_change_nid = zone_to_nid(zone);
1830 else
1831 arg->status_change_nid = -1;
1832}
1833
1834static void node_states_clear_node(int node, struct memory_notify *arg)
1835{
1836 if (arg->status_change_nid_normal >= 0)
1837 node_clear_state(node, N_NORMAL_MEMORY);
1838
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001839 if ((N_MEMORY != N_NORMAL_MEMORY) &&
1840 (arg->status_change_nid_high >= 0))
Lai Jiangshand9713672012-12-11 16:01:03 -08001841 node_clear_state(node, N_HIGH_MEMORY);
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001842
1843 if ((N_MEMORY != N_HIGH_MEMORY) &&
1844 (arg->status_change_nid >= 0))
1845 node_clear_state(node, N_MEMORY);
Lai Jiangshand9713672012-12-11 16:01:03 -08001846}
1847
Wen Congyanga16cee12012-10-08 16:33:58 -07001848static int __ref __offline_pages(unsigned long start_pfn,
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001849 unsigned long end_pfn, unsigned long timeout)
1850{
1851 unsigned long pfn, nr_pages, expire;
1852 long offlined_pages;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001853 int ret, drain, retry_max, node;
Cody P Schaferd7029092013-07-03 15:02:11 -07001854 unsigned long flags;
Toshi Kania96dfdd2017-02-03 13:13:23 -08001855 unsigned long valid_start, valid_end;
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001856 struct zone *zone;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001857 struct memory_notify arg;
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001858
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001859 /* at least, alignment against pageblock is necessary */
1860 if (!IS_ALIGNED(start_pfn, pageblock_nr_pages))
1861 return -EINVAL;
1862 if (!IS_ALIGNED(end_pfn, pageblock_nr_pages))
1863 return -EINVAL;
1864 /* This makes hotplug much easier...and readable.
1865 we assume this for now. .*/
Toshi Kania96dfdd2017-02-03 13:13:23 -08001866 if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end))
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001867 return -EINVAL;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001868
Toshi Kania96dfdd2017-02-03 13:13:23 -08001869 zone = page_zone(pfn_to_page(valid_start));
Yasunori Goto7b78d332007-10-21 16:41:36 -07001870 node = zone_to_nid(zone);
1871 nr_pages = end_pfn - start_pfn;
1872
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001873 if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages))
David Rientjes30467e02015-04-14 15:45:11 -07001874 return -EINVAL;
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001875
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001876 /* set above range as isolated */
Wen Congyangb023f462012-12-11 16:00:45 -08001877 ret = start_isolate_page_range(start_pfn, end_pfn,
1878 MIGRATE_MOVABLE, true);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001879 if (ret)
David Rientjes30467e02015-04-14 15:45:11 -07001880 return ret;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001881
1882 arg.start_pfn = start_pfn;
1883 arg.nr_pages = nr_pages;
Lai Jiangshand9713672012-12-11 16:01:03 -08001884 node_states_check_changes_offline(nr_pages, zone, &arg);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001885
1886 ret = memory_notify(MEM_GOING_OFFLINE, &arg);
1887 ret = notifier_to_errno(ret);
1888 if (ret)
1889 goto failed_removal;
1890
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001891 pfn = start_pfn;
1892 expire = jiffies + timeout;
1893 drain = 0;
1894 retry_max = 5;
1895repeat:
1896 /* start memory hot removal */
1897 ret = -EAGAIN;
1898 if (time_after(jiffies, expire))
1899 goto failed_removal;
1900 ret = -EINTR;
1901 if (signal_pending(current))
1902 goto failed_removal;
1903 ret = 0;
1904 if (drain) {
1905 lru_add_drain_all();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001906 cond_resched();
Vlastimil Babkac0554322014-12-10 15:43:10 -08001907 drain_all_pages(zone);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001908 }
1909
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001910 pfn = scan_movable_pages(start_pfn, end_pfn);
1911 if (pfn) { /* We have movable pages */
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001912 ret = do_migrate_range(pfn, end_pfn);
1913 if (!ret) {
1914 drain = 1;
1915 goto repeat;
1916 } else {
1917 if (ret < 0)
1918 if (--retry_max == 0)
1919 goto failed_removal;
1920 yield();
1921 drain = 1;
1922 goto repeat;
1923 }
1924 }
Adam Buchbinderb3834be2012-09-19 21:48:02 -04001925 /* drain all zone's lru pagevec, this is asynchronous... */
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001926 lru_add_drain_all();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001927 yield();
Adam Buchbinderb3834be2012-09-19 21:48:02 -04001928 /* drain pcp pages, this is synchronous. */
Vlastimil Babkac0554322014-12-10 15:43:10 -08001929 drain_all_pages(zone);
Naoya Horiguchic8721bb2013-09-11 14:22:09 -07001930 /*
1931 * dissolve free hugepages in the memory block before doing offlining
1932 * actually in order to make hugetlbfs's object counting consistent.
1933 */
Gerald Schaefer082d5b62016-10-07 17:01:10 -07001934 ret = dissolve_free_huge_pages(start_pfn, end_pfn);
1935 if (ret)
1936 goto failed_removal;
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001937 /* check again */
1938 offlined_pages = check_pages_isolated(start_pfn, end_pfn);
1939 if (offlined_pages < 0) {
1940 ret = -EBUSY;
1941 goto failed_removal;
1942 }
Chen Yuconge33e33b2016-03-17 14:19:35 -07001943 pr_info("Offlined Pages %ld\n", offlined_pages);
Adam Buchbinderb3834be2012-09-19 21:48:02 -04001944 /* Ok, all of our target is isolated.
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001945 We cannot do rollback at this point. */
1946 offline_isolated_pages(start_pfn, end_pfn);
KAMEZAWA Hiroyukidbc0e4c2007-11-14 16:59:12 -08001947 /* reset pagetype flags and makes migrate type to be MOVABLE */
Michal Nazarewicz0815f3d2012-04-03 15:06:15 +02001948 undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001949 /* removal success */
Jiang Liu3dcc0572013-07-03 15:03:21 -07001950 adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001951 zone->present_pages -= offlined_pages;
Cody P Schaferd7029092013-07-03 15:02:11 -07001952
1953 pgdat_resize_lock(zone->zone_pgdat, &flags);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001954 zone->zone_pgdat->node_present_pages -= offlined_pages;
Cody P Schaferd7029092013-07-03 15:02:11 -07001955 pgdat_resize_unlock(zone->zone_pgdat, &flags);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001956
KOSAKI Motohiro1b79acc2011-05-24 17:11:32 -07001957 init_per_zone_wmark_min();
1958
Xishi Qiu1e8537b2012-10-08 16:31:51 -07001959 if (!populated_zone(zone)) {
Jiang Liu340175b2012-07-31 16:43:32 -07001960 zone_pcp_reset(zone);
Xishi Qiu1e8537b2012-10-08 16:31:51 -07001961 mutex_lock(&zonelists_mutex);
1962 build_all_zonelists(NULL, NULL);
1963 mutex_unlock(&zonelists_mutex);
1964 } else
1965 zone_pcp_update(zone);
Jiang Liu340175b2012-07-31 16:43:32 -07001966
Lai Jiangshand9713672012-12-11 16:01:03 -08001967 node_states_clear_node(node, &arg);
Vlastimil Babka698b1b32016-03-17 14:18:08 -07001968 if (arg.status_change_nid >= 0) {
David Rientjes8fe23e02009-12-14 17:58:33 -08001969 kswapd_stop(node);
Vlastimil Babka698b1b32016-03-17 14:18:08 -07001970 kcompactd_stop(node);
1971 }
Minchan Kimbce73942009-06-16 15:32:50 -07001972
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001973 vm_total_pages = nr_free_pagecache_pages();
1974 writeback_set_ratelimit();
Yasunori Goto7b78d332007-10-21 16:41:36 -07001975
1976 memory_notify(MEM_OFFLINE, &arg);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001977 return 0;
1978
1979failed_removal:
Chen Yuconge33e33b2016-03-17 14:19:35 -07001980 pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n",
1981 (unsigned long long) start_pfn << PAGE_SHIFT,
1982 ((unsigned long long) end_pfn << PAGE_SHIFT) - 1);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001983 memory_notify(MEM_CANCEL_OFFLINE, &arg);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001984 /* pushback to free area */
Michal Nazarewicz0815f3d2012-04-03 15:06:15 +02001985 undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001986 return ret;
1987}
Badari Pulavarty71088782008-10-18 20:25:58 -07001988
David Rientjes30467e02015-04-14 15:45:11 -07001989/* Must be protected by mem_hotplug_begin() */
Wen Congyanga16cee12012-10-08 16:33:58 -07001990int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
1991{
1992 return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);
1993}
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +02001994#endif /* CONFIG_MEMORY_HOTREMOVE */
Wen Congyanga16cee12012-10-08 16:33:58 -07001995
Wen Congyangbbc76be2013-02-22 16:32:54 -08001996/**
1997 * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn)
1998 * @start_pfn: start pfn of the memory range
Toshi Kanie05c4bb2013-04-29 15:06:16 -07001999 * @end_pfn: end pfn of the memory range
Wen Congyangbbc76be2013-02-22 16:32:54 -08002000 * @arg: argument passed to func
2001 * @func: callback for each memory section walked
2002 *
2003 * This function walks through all present mem sections in range
2004 * [start_pfn, end_pfn) and call func on each mem section.
2005 *
2006 * Returns the return value of func.
2007 */
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +02002008int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
Wen Congyangbbc76be2013-02-22 16:32:54 -08002009 void *arg, int (*func)(struct memory_block *, void *))
Badari Pulavarty71088782008-10-18 20:25:58 -07002010{
Wen Congyange90bdb72012-10-08 16:34:01 -07002011 struct memory_block *mem = NULL;
2012 struct mem_section *section;
Wen Congyange90bdb72012-10-08 16:34:01 -07002013 unsigned long pfn, section_nr;
2014 int ret;
Badari Pulavarty71088782008-10-18 20:25:58 -07002015
Wen Congyange90bdb72012-10-08 16:34:01 -07002016 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
2017 section_nr = pfn_to_section_nr(pfn);
2018 if (!present_section_nr(section_nr))
2019 continue;
2020
2021 section = __nr_to_section(section_nr);
2022 /* same memblock? */
2023 if (mem)
2024 if ((section_nr >= mem->start_section_nr) &&
2025 (section_nr <= mem->end_section_nr))
2026 continue;
2027
2028 mem = find_memory_block_hinted(section, mem);
2029 if (!mem)
2030 continue;
2031
Wen Congyangbbc76be2013-02-22 16:32:54 -08002032 ret = func(mem, arg);
Wen Congyange90bdb72012-10-08 16:34:01 -07002033 if (ret) {
Wen Congyangbbc76be2013-02-22 16:32:54 -08002034 kobject_put(&mem->dev.kobj);
2035 return ret;
Wen Congyange90bdb72012-10-08 16:34:01 -07002036 }
2037 }
2038
2039 if (mem)
2040 kobject_put(&mem->dev.kobj);
2041
Wen Congyangbbc76be2013-02-22 16:32:54 -08002042 return 0;
2043}
2044
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +02002045#ifdef CONFIG_MEMORY_HOTREMOVE
Xishi Qiud6de9d52013-11-12 15:07:20 -08002046static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
Wen Congyangbbc76be2013-02-22 16:32:54 -08002047{
2048 int ret = !is_memblock_offlined(mem);
2049
Randy Dunlap349daa02013-04-29 15:08:49 -07002050 if (unlikely(ret)) {
2051 phys_addr_t beginpa, endpa;
2052
2053 beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr));
2054 endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1;
Joe Perches756a0252016-03-17 14:19:47 -07002055 pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n",
Randy Dunlap349daa02013-04-29 15:08:49 -07002056 &beginpa, &endpa);
2057 }
Wen Congyangbbc76be2013-02-22 16:32:54 -08002058
2059 return ret;
2060}
2061
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002062static int check_cpu_on_node(pg_data_t *pgdat)
Tang Chen60a5a192013-02-22 16:33:14 -08002063{
Tang Chen60a5a192013-02-22 16:33:14 -08002064 int cpu;
2065
2066 for_each_present_cpu(cpu) {
2067 if (cpu_to_node(cpu) == pgdat->node_id)
2068 /*
2069 * the cpu on this node isn't removed, and we can't
2070 * offline this node.
2071 */
2072 return -EBUSY;
2073 }
2074
2075 return 0;
2076}
2077
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002078static void unmap_cpu_on_node(pg_data_t *pgdat)
Wen Congyange13fe862013-02-22 16:33:31 -08002079{
2080#ifdef CONFIG_ACPI_NUMA
Wen Congyange13fe862013-02-22 16:33:31 -08002081 int cpu;
2082
2083 for_each_possible_cpu(cpu)
2084 if (cpu_to_node(cpu) == pgdat->node_id)
2085 numa_clear_node(cpu);
2086#endif
2087}
2088
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002089static int check_and_unmap_cpu_on_node(pg_data_t *pgdat)
Wen Congyange13fe862013-02-22 16:33:31 -08002090{
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002091 int ret;
Wen Congyange13fe862013-02-22 16:33:31 -08002092
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002093 ret = check_cpu_on_node(pgdat);
Wen Congyange13fe862013-02-22 16:33:31 -08002094 if (ret)
2095 return ret;
2096
2097 /*
2098 * the node will be offlined when we come here, so we can clear
2099 * the cpu_to_node() now.
2100 */
2101
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002102 unmap_cpu_on_node(pgdat);
Wen Congyange13fe862013-02-22 16:33:31 -08002103 return 0;
2104}
2105
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002106/**
2107 * try_offline_node
2108 *
2109 * Offline a node if all memory sections and cpus of the node are removed.
2110 *
2111 * NOTE: The caller must call lock_device_hotplug() to serialize hotplug
2112 * and online/offline operations before this call.
2113 */
Wen Congyang90b30cd2013-02-22 16:33:27 -08002114void try_offline_node(int nid)
Tang Chen60a5a192013-02-22 16:33:14 -08002115{
Wen Congyangd822b862013-02-22 16:33:16 -08002116 pg_data_t *pgdat = NODE_DATA(nid);
2117 unsigned long start_pfn = pgdat->node_start_pfn;
2118 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
Tang Chen60a5a192013-02-22 16:33:14 -08002119 unsigned long pfn;
2120
2121 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
2122 unsigned long section_nr = pfn_to_section_nr(pfn);
2123
2124 if (!present_section_nr(section_nr))
2125 continue;
2126
2127 if (pfn_to_nid(pfn) != nid)
2128 continue;
2129
2130 /*
2131 * some memory sections of this node are not removed, and we
2132 * can't offline node now.
2133 */
2134 return;
2135 }
2136
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002137 if (check_and_unmap_cpu_on_node(pgdat))
Tang Chen60a5a192013-02-22 16:33:14 -08002138 return;
2139
2140 /*
2141 * all memory/cpu of this node are removed, we can offline this
2142 * node now.
2143 */
2144 node_set_offline(nid);
2145 unregister_one_node(nid);
2146}
Wen Congyang90b30cd2013-02-22 16:33:27 -08002147EXPORT_SYMBOL(try_offline_node);
Tang Chen60a5a192013-02-22 16:33:14 -08002148
Toshi Kani0f1cfe92013-09-11 14:21:50 -07002149/**
2150 * remove_memory
2151 *
2152 * NOTE: The caller must call lock_device_hotplug() to serialize hotplug
2153 * and online/offline operations before this call, as required by
2154 * try_offline_node().
2155 */
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02002156void __ref remove_memory(int nid, u64 start, u64 size)
Wen Congyangbbc76be2013-02-22 16:32:54 -08002157{
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02002158 int ret;
Wen Congyang993c1aa2013-02-22 16:32:50 -08002159
Toshi Kani27356f52013-09-11 14:21:49 -07002160 BUG_ON(check_hotplug_memory_range(start, size));
2161
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07002162 mem_hotplug_begin();
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08002163
2164 /*
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02002165 * All memory blocks must be offlined before removing memory. Check
2166 * whether all memory blocks in question are offline and trigger a BUG()
2167 * if this is not the case.
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08002168 */
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02002169 ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
Xishi Qiud6de9d52013-11-12 15:07:20 -08002170 check_memblock_offlined_cb);
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07002171 if (ret)
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02002172 BUG();
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08002173
Yasuaki Ishimatsu46c66c42013-02-22 16:32:56 -08002174 /* remove memmap entry */
2175 firmware_map_remove(start, start + size, "System RAM");
Xishi Qiuf9126ab2015-08-14 15:35:16 -07002176 memblock_free(start, size);
2177 memblock_remove(start, size);
Yasuaki Ishimatsu46c66c42013-02-22 16:32:56 -08002178
Wen Congyang24d335c2013-02-22 16:32:58 -08002179 arch_remove_memory(start, size);
2180
Tang Chen60a5a192013-02-22 16:33:14 -08002181 try_offline_node(nid);
2182
Vladimir Davydovbfc8c902014-06-04 16:07:18 -07002183 mem_hotplug_done();
Badari Pulavarty71088782008-10-18 20:25:58 -07002184}
Badari Pulavarty71088782008-10-18 20:25:58 -07002185EXPORT_SYMBOL_GPL(remove_memory);
Rafael J. Wysockiaba6efc2013-06-01 22:24:07 +02002186#endif /* CONFIG_MEMORY_HOTREMOVE */