Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d41dee36 AW |
2 | /* |
3 | * sparse memory mappings. | |
4 | */ | |
d41dee36 | 5 | #include <linux/mm.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
d41dee36 | 7 | #include <linux/mmzone.h> |
97ad1087 | 8 | #include <linux/memblock.h> |
3b32123d | 9 | #include <linux/compiler.h> |
0b0acbec | 10 | #include <linux/highmem.h> |
b95f1b31 | 11 | #include <linux/export.h> |
28ae55c9 | 12 | #include <linux/spinlock.h> |
0b0acbec | 13 | #include <linux/vmalloc.h> |
9f82883c AS |
14 | #include <linux/swap.h> |
15 | #include <linux/swapops.h> | |
3b32123d | 16 | |
0c0a4a51 | 17 | #include "internal.h" |
d41dee36 | 18 | #include <asm/dma.h> |
8f6aac41 CL |
19 | #include <asm/pgalloc.h> |
20 | #include <asm/pgtable.h> | |
d41dee36 AW |
21 | |
22 | /* | |
23 | * Permanent SPARSEMEM data: | |
24 | * | |
25 | * 1) mem_section - memory sections, mem_map's for valid memory | |
26 | */ | |
3e347261 | 27 | #ifdef CONFIG_SPARSEMEM_EXTREME |
83e3c487 | 28 | struct mem_section **mem_section; |
3e347261 BP |
29 | #else |
30 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 31 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
32 | #endif |
33 | EXPORT_SYMBOL(mem_section); | |
34 | ||
89689ae7 CL |
35 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
36 | /* | |
37 | * If we did not store the node number in the page then we have to | |
38 | * do a lookup in the section_to_node_table in order to find which | |
39 | * node the page belongs to. | |
40 | */ | |
41 | #if MAX_NUMNODES <= 256 | |
42 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
43 | #else | |
44 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
45 | #endif | |
46 | ||
33dd4e0e | 47 | int page_to_nid(const struct page *page) |
89689ae7 CL |
48 | { |
49 | return section_to_node_table[page_to_section(page)]; | |
50 | } | |
51 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
52 | |
53 | static void set_section_nid(unsigned long section_nr, int nid) | |
54 | { | |
55 | section_to_node_table[section_nr] = nid; | |
56 | } | |
57 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
58 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
59 | { | |
60 | } | |
89689ae7 CL |
61 | #endif |
62 | ||
3e347261 | 63 | #ifdef CONFIG_SPARSEMEM_EXTREME |
bd721ea7 | 64 | static noinline struct mem_section __ref *sparse_index_alloc(int nid) |
28ae55c9 DH |
65 | { |
66 | struct mem_section *section = NULL; | |
67 | unsigned long array_size = SECTIONS_PER_ROOT * | |
68 | sizeof(struct mem_section); | |
69 | ||
8a7f97b9 | 70 | if (slab_is_available()) { |
b95046b0 | 71 | section = kzalloc_node(array_size, GFP_KERNEL, nid); |
8a7f97b9 | 72 | } else { |
7e1c4e27 MR |
73 | section = memblock_alloc_node(array_size, SMP_CACHE_BYTES, |
74 | nid); | |
8a7f97b9 MR |
75 | if (!section) |
76 | panic("%s: Failed to allocate %lu bytes nid=%d\n", | |
77 | __func__, array_size, nid); | |
78 | } | |
28ae55c9 DH |
79 | |
80 | return section; | |
3e347261 | 81 | } |
802f192e | 82 | |
a3142c8e | 83 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 84 | { |
28ae55c9 DH |
85 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
86 | struct mem_section *section; | |
802f192e | 87 | |
ba72b4c8 DW |
88 | /* |
89 | * An existing section is possible in the sub-section hotplug | |
90 | * case. First hot-add instantiates, follow-on hot-add reuses | |
91 | * the existing section. | |
92 | * | |
93 | * The mem_hotplug_lock resolves the apparent race below. | |
94 | */ | |
802f192e | 95 | if (mem_section[root]) |
ba72b4c8 | 96 | return 0; |
3e347261 | 97 | |
28ae55c9 | 98 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
99 | if (!section) |
100 | return -ENOMEM; | |
28ae55c9 DH |
101 | |
102 | mem_section[root] = section; | |
c1c95183 | 103 | |
9d1936cf | 104 | return 0; |
28ae55c9 DH |
105 | } |
106 | #else /* !SPARSEMEM_EXTREME */ | |
107 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
108 | { | |
109 | return 0; | |
802f192e | 110 | } |
28ae55c9 DH |
111 | #endif |
112 | ||
91fd8b95 | 113 | #ifdef CONFIG_SPARSEMEM_EXTREME |
2491f0a2 | 114 | unsigned long __section_nr(struct mem_section *ms) |
4ca644d9 DH |
115 | { |
116 | unsigned long root_nr; | |
83e3c487 | 117 | struct mem_section *root = NULL; |
4ca644d9 | 118 | |
12783b00 MK |
119 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
120 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
121 | if (!root) |
122 | continue; | |
123 | ||
124 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
125 | break; | |
126 | } | |
127 | ||
83e3c487 | 128 | VM_BUG_ON(!root); |
db36a461 | 129 | |
4ca644d9 DH |
130 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); |
131 | } | |
91fd8b95 | 132 | #else |
2491f0a2 | 133 | unsigned long __section_nr(struct mem_section *ms) |
91fd8b95 | 134 | { |
2491f0a2 | 135 | return (unsigned long)(ms - mem_section[0]); |
91fd8b95 ZC |
136 | } |
137 | #endif | |
4ca644d9 | 138 | |
30c253e6 AW |
139 | /* |
140 | * During early boot, before section_mem_map is used for an actual | |
141 | * mem_map, we use section_mem_map to store the section's NUMA | |
142 | * node. This keeps us from having to use another data structure. The | |
143 | * node information is cleared just before we store the real mem_map. | |
144 | */ | |
145 | static inline unsigned long sparse_encode_early_nid(int nid) | |
146 | { | |
147 | return (nid << SECTION_NID_SHIFT); | |
148 | } | |
149 | ||
150 | static inline int sparse_early_nid(struct mem_section *section) | |
151 | { | |
152 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
153 | } | |
154 | ||
2dbb51c4 MG |
155 | /* Validate the physical addressing limitations of the model */ |
156 | void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
157 | unsigned long *end_pfn) | |
d41dee36 | 158 | { |
2dbb51c4 | 159 | unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 | 160 | |
bead9a3a IM |
161 | /* |
162 | * Sanity checks - do not allow an architecture to pass | |
163 | * in larger pfns than the maximum scope of sparsemem: | |
164 | */ | |
2dbb51c4 MG |
165 | if (*start_pfn > max_sparsemem_pfn) { |
166 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
167 | "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
168 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
169 | WARN_ON_ONCE(1); | |
170 | *start_pfn = max_sparsemem_pfn; | |
171 | *end_pfn = max_sparsemem_pfn; | |
ef161a98 | 172 | } else if (*end_pfn > max_sparsemem_pfn) { |
2dbb51c4 MG |
173 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", |
174 | "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
175 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
176 | WARN_ON_ONCE(1); | |
177 | *end_pfn = max_sparsemem_pfn; | |
178 | } | |
179 | } | |
180 | ||
c4e1be9e DH |
181 | /* |
182 | * There are a number of times that we loop over NR_MEM_SECTIONS, | |
183 | * looking for section_present() on each. But, when we have very | |
184 | * large physical address spaces, NR_MEM_SECTIONS can also be | |
185 | * very large which makes the loops quite long. | |
186 | * | |
187 | * Keeping track of this gives us an easy way to break out of | |
188 | * those loops early. | |
189 | */ | |
2491f0a2 | 190 | unsigned long __highest_present_section_nr; |
c4e1be9e DH |
191 | static void section_mark_present(struct mem_section *ms) |
192 | { | |
2491f0a2 | 193 | unsigned long section_nr = __section_nr(ms); |
c4e1be9e DH |
194 | |
195 | if (section_nr > __highest_present_section_nr) | |
196 | __highest_present_section_nr = section_nr; | |
197 | ||
198 | ms->section_mem_map |= SECTION_MARKED_PRESENT; | |
199 | } | |
200 | ||
c4e1be9e DH |
201 | #define for_each_present_section_nr(start, section_nr) \ |
202 | for (section_nr = next_present_section_nr(start-1); \ | |
d778015a | 203 | ((section_nr != -1) && \ |
c4e1be9e DH |
204 | (section_nr <= __highest_present_section_nr)); \ |
205 | section_nr = next_present_section_nr(section_nr)) | |
206 | ||
85c77f79 PT |
207 | static inline unsigned long first_present_section_nr(void) |
208 | { | |
209 | return next_present_section_nr(-1); | |
210 | } | |
211 | ||
0a9f9f62 | 212 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
758b8db4 | 213 | static void subsection_mask_set(unsigned long *map, unsigned long pfn, |
f46edbd1 DW |
214 | unsigned long nr_pages) |
215 | { | |
216 | int idx = subsection_map_index(pfn); | |
217 | int end = subsection_map_index(pfn + nr_pages - 1); | |
218 | ||
219 | bitmap_set(map, idx, end - idx + 1); | |
220 | } | |
221 | ||
222 | void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) | |
223 | { | |
224 | int end_sec = pfn_to_section_nr(pfn + nr_pages - 1); | |
9a845030 | 225 | unsigned long nr, start_sec = pfn_to_section_nr(pfn); |
f46edbd1 DW |
226 | |
227 | if (!nr_pages) | |
228 | return; | |
229 | ||
9a845030 | 230 | for (nr = start_sec; nr <= end_sec; nr++) { |
f46edbd1 DW |
231 | struct mem_section *ms; |
232 | unsigned long pfns; | |
233 | ||
234 | pfns = min(nr_pages, PAGES_PER_SECTION | |
235 | - (pfn & ~PAGE_SECTION_MASK)); | |
9a845030 | 236 | ms = __nr_to_section(nr); |
f46edbd1 DW |
237 | subsection_mask_set(ms->usage->subsection_map, pfn, pfns); |
238 | ||
9a845030 | 239 | pr_debug("%s: sec: %lu pfns: %lu set(%d, %d)\n", __func__, nr, |
f46edbd1 DW |
240 | pfns, subsection_map_index(pfn), |
241 | subsection_map_index(pfn + pfns - 1)); | |
242 | ||
243 | pfn += pfns; | |
244 | nr_pages -= pfns; | |
245 | } | |
246 | } | |
0a9f9f62 BH |
247 | #else |
248 | void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) | |
249 | { | |
250 | } | |
251 | #endif | |
f46edbd1 | 252 | |
2dbb51c4 MG |
253 | /* Record a memory area against a node. */ |
254 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
255 | { | |
256 | unsigned long pfn; | |
bead9a3a | 257 | |
629a359b KS |
258 | #ifdef CONFIG_SPARSEMEM_EXTREME |
259 | if (unlikely(!mem_section)) { | |
260 | unsigned long size, align; | |
261 | ||
d09cfbbf | 262 | size = sizeof(struct mem_section*) * NR_SECTION_ROOTS; |
629a359b | 263 | align = 1 << (INTERNODE_CACHE_SHIFT); |
eb31d559 | 264 | mem_section = memblock_alloc(size, align); |
8a7f97b9 MR |
265 | if (!mem_section) |
266 | panic("%s: Failed to allocate %lu bytes align=0x%lx\n", | |
267 | __func__, size, align); | |
629a359b KS |
268 | } |
269 | #endif | |
270 | ||
d41dee36 | 271 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 272 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
273 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
274 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
275 | struct mem_section *ms; |
276 | ||
277 | sparse_index_init(section, nid); | |
85770ffe | 278 | set_section_nid(section, nid); |
802f192e BP |
279 | |
280 | ms = __nr_to_section(section); | |
c4e1be9e | 281 | if (!ms->section_mem_map) { |
2d070eab MH |
282 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
283 | SECTION_IS_ONLINE; | |
c4e1be9e DH |
284 | section_mark_present(ms); |
285 | } | |
d41dee36 AW |
286 | } |
287 | } | |
288 | ||
9def36e0 LG |
289 | /* |
290 | * Mark all memblocks as present using memory_present(). This is a | |
291 | * convienence function that is useful for a number of arches | |
292 | * to mark all of the systems memory as present during initialization. | |
293 | */ | |
294 | void __init memblocks_present(void) | |
295 | { | |
296 | struct memblock_region *reg; | |
297 | ||
298 | for_each_memblock(memory, reg) { | |
299 | memory_present(memblock_get_region_node(reg), | |
300 | memblock_region_memory_base_pfn(reg), | |
301 | memblock_region_memory_end_pfn(reg)); | |
302 | } | |
303 | } | |
304 | ||
29751f69 AW |
305 | /* |
306 | * Subtle, we encode the real pfn into the mem_map such that | |
307 | * the identity pfn - section_mem_map will return the actual | |
308 | * physical page frame number. | |
309 | */ | |
310 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
311 | { | |
def9b71e PT |
312 | unsigned long coded_mem_map = |
313 | (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
314 | BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT)); | |
315 | BUG_ON(coded_mem_map & ~SECTION_MAP_MASK); | |
316 | return coded_mem_map; | |
29751f69 AW |
317 | } |
318 | ||
319 | /* | |
ea01ea93 | 320 | * Decode mem_map from the coded memmap |
29751f69 | 321 | */ |
29751f69 AW |
322 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
323 | { | |
ea01ea93 BP |
324 | /* mask off the extra low bits of information */ |
325 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
326 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
327 | } | |
328 | ||
4e40987f | 329 | static void __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 | 330 | unsigned long pnum, struct page *mem_map, |
326e1b8f | 331 | struct mem_section_usage *usage, unsigned long flags) |
29751f69 | 332 | { |
30c253e6 | 333 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
326e1b8f DW |
334 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
335 | | SECTION_HAS_MEM_MAP | flags; | |
f1eca35a | 336 | ms->usage = usage; |
29751f69 AW |
337 | } |
338 | ||
f1eca35a | 339 | static unsigned long usemap_size(void) |
5c0e3066 | 340 | { |
60a7a88d | 341 | return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long); |
5c0e3066 MG |
342 | } |
343 | ||
f1eca35a | 344 | size_t mem_section_usage_size(void) |
5c0e3066 | 345 | { |
f1eca35a | 346 | return sizeof(struct mem_section_usage) + usemap_size(); |
5c0e3066 | 347 | } |
5c0e3066 | 348 | |
48c90682 | 349 | #ifdef CONFIG_MEMORY_HOTREMOVE |
f1eca35a | 350 | static struct mem_section_usage * __init |
a4322e1b | 351 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 352 | unsigned long size) |
48c90682 | 353 | { |
f1eca35a | 354 | struct mem_section_usage *usage; |
99ab7b19 | 355 | unsigned long goal, limit; |
99ab7b19 | 356 | int nid; |
48c90682 YG |
357 | /* |
358 | * A page may contain usemaps for other sections preventing the | |
359 | * page being freed and making a section unremovable while | |
c800bcd5 | 360 | * other sections referencing the usemap remain active. Similarly, |
48c90682 YG |
361 | * a pgdat can prevent a section being removed. If section A |
362 | * contains a pgdat and section B contains the usemap, both | |
363 | * sections become inter-dependent. This allocates usemaps | |
364 | * from the same section as the pgdat where possible to avoid | |
365 | * this problem. | |
366 | */ | |
07b4e2bc | 367 | goal = __pa(pgdat) & (PAGE_SECTION_MASK << PAGE_SHIFT); |
99ab7b19 YL |
368 | limit = goal + (1UL << PA_SECTION_SHIFT); |
369 | nid = early_pfn_to_nid(goal >> PAGE_SHIFT); | |
370 | again: | |
f1eca35a DW |
371 | usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid); |
372 | if (!usage && limit) { | |
99ab7b19 YL |
373 | limit = 0; |
374 | goto again; | |
375 | } | |
f1eca35a | 376 | return usage; |
48c90682 YG |
377 | } |
378 | ||
f1eca35a DW |
379 | static void __init check_usemap_section_nr(int nid, |
380 | struct mem_section_usage *usage) | |
48c90682 YG |
381 | { |
382 | unsigned long usemap_snr, pgdat_snr; | |
83e3c487 KS |
383 | static unsigned long old_usemap_snr; |
384 | static unsigned long old_pgdat_snr; | |
48c90682 YG |
385 | struct pglist_data *pgdat = NODE_DATA(nid); |
386 | int usemap_nid; | |
387 | ||
83e3c487 KS |
388 | /* First call */ |
389 | if (!old_usemap_snr) { | |
390 | old_usemap_snr = NR_MEM_SECTIONS; | |
391 | old_pgdat_snr = NR_MEM_SECTIONS; | |
392 | } | |
393 | ||
f1eca35a | 394 | usemap_snr = pfn_to_section_nr(__pa(usage) >> PAGE_SHIFT); |
48c90682 YG |
395 | pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); |
396 | if (usemap_snr == pgdat_snr) | |
397 | return; | |
398 | ||
399 | if (old_usemap_snr == usemap_snr && old_pgdat_snr == pgdat_snr) | |
400 | /* skip redundant message */ | |
401 | return; | |
402 | ||
403 | old_usemap_snr = usemap_snr; | |
404 | old_pgdat_snr = pgdat_snr; | |
405 | ||
406 | usemap_nid = sparse_early_nid(__nr_to_section(usemap_snr)); | |
407 | if (usemap_nid != nid) { | |
1170532b JP |
408 | pr_info("node %d must be removed before remove section %ld\n", |
409 | nid, usemap_snr); | |
48c90682 YG |
410 | return; |
411 | } | |
412 | /* | |
413 | * There is a circular dependency. | |
414 | * Some platforms allow un-removable section because they will just | |
415 | * gather other removable sections for dynamic partitioning. | |
416 | * Just notify un-removable section's number here. | |
417 | */ | |
1170532b JP |
418 | pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\n", |
419 | usemap_snr, pgdat_snr, nid); | |
48c90682 YG |
420 | } |
421 | #else | |
f1eca35a | 422 | static struct mem_section_usage * __init |
a4322e1b | 423 | sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat, |
238305bb | 424 | unsigned long size) |
48c90682 | 425 | { |
26fb3dae | 426 | return memblock_alloc_node(size, SMP_CACHE_BYTES, pgdat->node_id); |
48c90682 YG |
427 | } |
428 | ||
f1eca35a DW |
429 | static void __init check_usemap_section_nr(int nid, |
430 | struct mem_section_usage *usage) | |
48c90682 YG |
431 | { |
432 | } | |
433 | #endif /* CONFIG_MEMORY_HOTREMOVE */ | |
434 | ||
35fd1eb1 | 435 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
afda57bc | 436 | static unsigned long __init section_map_size(void) |
35fd1eb1 PT |
437 | { |
438 | return ALIGN(sizeof(struct page) * PAGES_PER_SECTION, PMD_SIZE); | |
439 | } | |
440 | ||
441 | #else | |
afda57bc | 442 | static unsigned long __init section_map_size(void) |
e131c06b PT |
443 | { |
444 | return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION); | |
445 | } | |
446 | ||
e9c0a3f0 DW |
447 | struct page __init *__populate_section_memmap(unsigned long pfn, |
448 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) | |
29751f69 | 449 | { |
e131c06b PT |
450 | unsigned long size = section_map_size(); |
451 | struct page *map = sparse_buffer_alloc(size); | |
8a7f97b9 | 452 | phys_addr_t addr = __pa(MAX_DMA_ADDRESS); |
e131c06b PT |
453 | |
454 | if (map) | |
455 | return map; | |
29751f69 | 456 | |
09dbcf42 | 457 | map = memblock_alloc_try_nid_raw(size, size, addr, |
97ad1087 | 458 | MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
8a7f97b9 MR |
459 | if (!map) |
460 | panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n", | |
461 | __func__, size, PAGE_SIZE, nid, &addr); | |
462 | ||
8f6aac41 CL |
463 | return map; |
464 | } | |
465 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
466 | ||
35fd1eb1 PT |
467 | static void *sparsemap_buf __meminitdata; |
468 | static void *sparsemap_buf_end __meminitdata; | |
469 | ||
ae831894 LC |
470 | static inline void __meminit sparse_buffer_free(unsigned long size) |
471 | { | |
472 | WARN_ON(!sparsemap_buf || size == 0); | |
473 | memblock_free_early(__pa(sparsemap_buf), size); | |
474 | } | |
475 | ||
afda57bc | 476 | static void __init sparse_buffer_init(unsigned long size, int nid) |
35fd1eb1 | 477 | { |
8a7f97b9 | 478 | phys_addr_t addr = __pa(MAX_DMA_ADDRESS); |
35fd1eb1 | 479 | WARN_ON(sparsemap_buf); /* forgot to call sparse_buffer_fini()? */ |
09dbcf42 MH |
480 | /* |
481 | * Pre-allocated buffer is mainly used by __populate_section_memmap | |
482 | * and we want it to be properly aligned to the section size - this is | |
483 | * especially the case for VMEMMAP which maps memmap to PMDs | |
484 | */ | |
0ac398b1 | 485 | sparsemap_buf = memblock_alloc_exact_nid_raw(size, section_map_size(), |
09dbcf42 | 486 | addr, MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
35fd1eb1 PT |
487 | sparsemap_buf_end = sparsemap_buf + size; |
488 | } | |
489 | ||
afda57bc | 490 | static void __init sparse_buffer_fini(void) |
35fd1eb1 PT |
491 | { |
492 | unsigned long size = sparsemap_buf_end - sparsemap_buf; | |
493 | ||
494 | if (sparsemap_buf && size > 0) | |
ae831894 | 495 | sparse_buffer_free(size); |
35fd1eb1 PT |
496 | sparsemap_buf = NULL; |
497 | } | |
498 | ||
499 | void * __meminit sparse_buffer_alloc(unsigned long size) | |
500 | { | |
501 | void *ptr = NULL; | |
502 | ||
503 | if (sparsemap_buf) { | |
db57e98d | 504 | ptr = (void *) roundup((unsigned long)sparsemap_buf, size); |
35fd1eb1 PT |
505 | if (ptr + size > sparsemap_buf_end) |
506 | ptr = NULL; | |
ae831894 LC |
507 | else { |
508 | /* Free redundant aligned space */ | |
509 | if ((unsigned long)(ptr - sparsemap_buf) > 0) | |
510 | sparse_buffer_free((unsigned long)(ptr - sparsemap_buf)); | |
35fd1eb1 | 511 | sparsemap_buf = ptr + size; |
ae831894 | 512 | } |
35fd1eb1 PT |
513 | } |
514 | return ptr; | |
515 | } | |
516 | ||
3b32123d | 517 | void __weak __meminit vmemmap_populate_print_last(void) |
c2b91e2e YL |
518 | { |
519 | } | |
a4322e1b | 520 | |
85c77f79 PT |
521 | /* |
522 | * Initialize sparse on a specific node. The node spans [pnum_begin, pnum_end) | |
523 | * And number of present sections in this node is map_count. | |
524 | */ | |
525 | static void __init sparse_init_nid(int nid, unsigned long pnum_begin, | |
526 | unsigned long pnum_end, | |
527 | unsigned long map_count) | |
528 | { | |
f1eca35a DW |
529 | struct mem_section_usage *usage; |
530 | unsigned long pnum; | |
85c77f79 PT |
531 | struct page *map; |
532 | ||
f1eca35a DW |
533 | usage = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid), |
534 | mem_section_usage_size() * map_count); | |
535 | if (!usage) { | |
85c77f79 PT |
536 | pr_err("%s: node[%d] usemap allocation failed", __func__, nid); |
537 | goto failed; | |
538 | } | |
539 | sparse_buffer_init(map_count * section_map_size(), nid); | |
540 | for_each_present_section_nr(pnum_begin, pnum) { | |
e9c0a3f0 DW |
541 | unsigned long pfn = section_nr_to_pfn(pnum); |
542 | ||
85c77f79 PT |
543 | if (pnum >= pnum_end) |
544 | break; | |
545 | ||
e9c0a3f0 DW |
546 | map = __populate_section_memmap(pfn, PAGES_PER_SECTION, |
547 | nid, NULL); | |
85c77f79 PT |
548 | if (!map) { |
549 | pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.", | |
550 | __func__, nid); | |
551 | pnum_begin = pnum; | |
552 | goto failed; | |
553 | } | |
f1eca35a | 554 | check_usemap_section_nr(nid, usage); |
326e1b8f DW |
555 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage, |
556 | SECTION_IS_EARLY); | |
f1eca35a | 557 | usage = (void *) usage + mem_section_usage_size(); |
85c77f79 PT |
558 | } |
559 | sparse_buffer_fini(); | |
560 | return; | |
561 | failed: | |
562 | /* We failed to allocate, mark all the following pnums as not present */ | |
563 | for_each_present_section_nr(pnum_begin, pnum) { | |
564 | struct mem_section *ms; | |
565 | ||
566 | if (pnum >= pnum_end) | |
567 | break; | |
568 | ms = __nr_to_section(pnum); | |
569 | ms->section_mem_map = 0; | |
570 | } | |
571 | } | |
572 | ||
573 | /* | |
574 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
575 | * for each and record the physical to section mapping. | |
576 | */ | |
2a3cb8ba | 577 | void __init sparse_init(void) |
85c77f79 PT |
578 | { |
579 | unsigned long pnum_begin = first_present_section_nr(); | |
580 | int nid_begin = sparse_early_nid(__nr_to_section(pnum_begin)); | |
581 | unsigned long pnum_end, map_count = 1; | |
582 | ||
583 | /* Setup pageblock_order for HUGETLB_PAGE_SIZE_VARIABLE */ | |
584 | set_pageblock_order(); | |
585 | ||
586 | for_each_present_section_nr(pnum_begin + 1, pnum_end) { | |
587 | int nid = sparse_early_nid(__nr_to_section(pnum_end)); | |
588 | ||
589 | if (nid == nid_begin) { | |
590 | map_count++; | |
591 | continue; | |
592 | } | |
593 | /* Init node with sections in range [pnum_begin, pnum_end) */ | |
594 | sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); | |
595 | nid_begin = nid; | |
596 | pnum_begin = pnum_end; | |
597 | map_count = 1; | |
598 | } | |
599 | /* cover the last node */ | |
600 | sparse_init_nid(nid_begin, pnum_begin, pnum_end, map_count); | |
601 | vmemmap_populate_print_last(); | |
602 | } | |
603 | ||
193faea9 | 604 | #ifdef CONFIG_MEMORY_HOTPLUG |
2d070eab MH |
605 | |
606 | /* Mark all memory sections within the pfn range as online */ | |
607 | void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn) | |
608 | { | |
609 | unsigned long pfn; | |
610 | ||
611 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
b4ccec41 | 612 | unsigned long section_nr = pfn_to_section_nr(pfn); |
2d070eab MH |
613 | struct mem_section *ms; |
614 | ||
615 | /* onlining code should never touch invalid ranges */ | |
616 | if (WARN_ON(!valid_section_nr(section_nr))) | |
617 | continue; | |
618 | ||
619 | ms = __nr_to_section(section_nr); | |
620 | ms->section_mem_map |= SECTION_IS_ONLINE; | |
621 | } | |
622 | } | |
623 | ||
624 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
9b7ea46a | 625 | /* Mark all memory sections within the pfn range as offline */ |
2d070eab MH |
626 | void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) |
627 | { | |
628 | unsigned long pfn; | |
629 | ||
630 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
27227c73 | 631 | unsigned long section_nr = pfn_to_section_nr(pfn); |
2d070eab MH |
632 | struct mem_section *ms; |
633 | ||
634 | /* | |
635 | * TODO this needs some double checking. Offlining code makes | |
636 | * sure to check pfn_valid but those checks might be just bogus | |
637 | */ | |
638 | if (WARN_ON(!valid_section_nr(section_nr))) | |
639 | continue; | |
640 | ||
641 | ms = __nr_to_section(section_nr); | |
642 | ms->section_mem_map &= ~SECTION_IS_ONLINE; | |
643 | } | |
644 | } | |
645 | #endif | |
646 | ||
98f3cfc1 | 647 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
030eab4f | 648 | static struct page * __meminit populate_section_memmap(unsigned long pfn, |
e9c0a3f0 | 649 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) |
98f3cfc1 | 650 | { |
e9c0a3f0 | 651 | return __populate_section_memmap(pfn, nr_pages, nid, altmap); |
98f3cfc1 | 652 | } |
e9c0a3f0 DW |
653 | |
654 | static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, | |
24b6d416 | 655 | struct vmem_altmap *altmap) |
98f3cfc1 | 656 | { |
e9c0a3f0 DW |
657 | unsigned long start = (unsigned long) pfn_to_page(pfn); |
658 | unsigned long end = start + nr_pages * sizeof(struct page); | |
0aad818b | 659 | |
24b6d416 | 660 | vmemmap_free(start, end, altmap); |
98f3cfc1 | 661 | } |
81556b02 | 662 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 | 663 | { |
0aad818b | 664 | unsigned long start = (unsigned long)memmap; |
81556b02 | 665 | unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); |
0aad818b | 666 | |
24b6d416 | 667 | vmemmap_free(start, end, NULL); |
0c0a4a51 | 668 | } |
98f3cfc1 | 669 | #else |
030eab4f | 670 | struct page * __meminit populate_section_memmap(unsigned long pfn, |
e9c0a3f0 | 671 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap) |
0b0acbec | 672 | { |
4027149a BH |
673 | return kvmalloc_node(array_size(sizeof(struct page), |
674 | PAGES_PER_SECTION), GFP_KERNEL, nid); | |
0b0acbec DH |
675 | } |
676 | ||
e9c0a3f0 | 677 | static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, |
7b73d978 | 678 | struct vmem_altmap *altmap) |
98f3cfc1 | 679 | { |
3af776f6 | 680 | kvfree(pfn_to_page(pfn)); |
0b0acbec | 681 | } |
0c0a4a51 | 682 | |
81556b02 | 683 | static void free_map_bootmem(struct page *memmap) |
0c0a4a51 YG |
684 | { |
685 | unsigned long maps_section_nr, removing_section_nr, i; | |
81556b02 | 686 | unsigned long magic, nr_pages; |
ae64ffca | 687 | struct page *page = virt_to_page(memmap); |
0c0a4a51 | 688 | |
81556b02 ZY |
689 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) |
690 | >> PAGE_SHIFT; | |
691 | ||
0c0a4a51 | 692 | for (i = 0; i < nr_pages; i++, page++) { |
ddffe98d | 693 | magic = (unsigned long) page->freelist; |
0c0a4a51 YG |
694 | |
695 | BUG_ON(magic == NODE_INFO); | |
696 | ||
697 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
857e522a | 698 | removing_section_nr = page_private(page); |
0c0a4a51 YG |
699 | |
700 | /* | |
701 | * When this function is called, the removing section is | |
702 | * logical offlined state. This means all pages are isolated | |
703 | * from page allocator. If removing section's memmap is placed | |
704 | * on the same section, it must not be freed. | |
705 | * If it is freed, page allocator may allocate it which will | |
706 | * be removed physically soon. | |
707 | */ | |
708 | if (maps_section_nr != removing_section_nr) | |
709 | put_page_bootmem(page); | |
710 | } | |
711 | } | |
98f3cfc1 | 712 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 713 | |
0a9f9f62 | 714 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
37bc1502 | 715 | static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) |
ba72b4c8 DW |
716 | { |
717 | DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; | |
718 | DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; | |
719 | struct mem_section *ms = __pfn_to_section(pfn); | |
ba72b4c8 DW |
720 | unsigned long *subsection_map = ms->usage |
721 | ? &ms->usage->subsection_map[0] : NULL; | |
722 | ||
723 | subsection_mask_set(map, pfn, nr_pages); | |
724 | if (subsection_map) | |
725 | bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); | |
726 | ||
727 | if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), | |
728 | "section already deactivated (%#lx + %ld)\n", | |
729 | pfn, nr_pages)) | |
37bc1502 | 730 | return -EINVAL; |
ba72b4c8 | 731 | |
37bc1502 BH |
732 | bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); |
733 | return 0; | |
734 | } | |
735 | ||
736 | static bool is_subsection_map_empty(struct mem_section *ms) | |
737 | { | |
738 | return bitmap_empty(&ms->usage->subsection_map[0], | |
739 | SUBSECTIONS_PER_SECTION); | |
740 | } | |
0a9f9f62 BH |
741 | #else |
742 | static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) | |
743 | { | |
744 | return 0; | |
745 | } | |
746 | ||
747 | static bool is_subsection_map_empty(struct mem_section *ms) | |
748 | { | |
749 | return true; | |
750 | } | |
751 | #endif | |
37bc1502 | 752 | |
95a5a34d BH |
753 | /* |
754 | * To deactivate a memory region, there are 3 cases to handle across | |
755 | * two configurations (SPARSEMEM_VMEMMAP={y,n}): | |
756 | * | |
757 | * 1. deactivation of a partial hot-added section (only possible in | |
758 | * the SPARSEMEM_VMEMMAP=y case). | |
759 | * a) section was present at memory init. | |
760 | * b) section was hot-added post memory init. | |
761 | * 2. deactivation of a complete hot-added section. | |
762 | * 3. deactivation of a complete section from memory init. | |
763 | * | |
764 | * For 1, when subsection_map does not empty we will not be freeing the | |
765 | * usage map, but still need to free the vmemmap range. | |
766 | * | |
767 | * For 2 and 3, the SPARSEMEM_VMEMMAP={y,n} cases are unified | |
768 | */ | |
37bc1502 BH |
769 | static void section_deactivate(unsigned long pfn, unsigned long nr_pages, |
770 | struct vmem_altmap *altmap) | |
771 | { | |
772 | struct mem_section *ms = __pfn_to_section(pfn); | |
773 | bool section_is_early = early_section(ms); | |
774 | struct page *memmap = NULL; | |
775 | bool empty; | |
776 | ||
777 | if (clear_subsection_map(pfn, nr_pages)) | |
778 | return; | |
95a5a34d | 779 | |
37bc1502 | 780 | empty = is_subsection_map_empty(ms); |
d41e2f3b | 781 | if (empty) { |
ba72b4c8 DW |
782 | unsigned long section_nr = pfn_to_section_nr(pfn); |
783 | ||
8068df3b DH |
784 | /* |
785 | * When removing an early section, the usage map is kept (as the | |
786 | * usage maps of other sections fall into the same page). It | |
787 | * will be re-used when re-adding the section - which is then no | |
788 | * longer an early section. If the usage map is PageReserved, it | |
789 | * was allocated during boot. | |
790 | */ | |
791 | if (!PageReserved(virt_to_page(ms->usage))) { | |
ba72b4c8 DW |
792 | kfree(ms->usage); |
793 | ms->usage = NULL; | |
794 | } | |
795 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
b943f045 AK |
796 | /* |
797 | * Mark the section invalid so that valid_section() | |
798 | * return false. This prevents code from dereferencing | |
799 | * ms->usage array. | |
800 | */ | |
801 | ms->section_mem_map &= ~SECTION_HAS_MEM_MAP; | |
ba72b4c8 DW |
802 | } |
803 | ||
804 | if (section_is_early && memmap) | |
805 | free_map_bootmem(memmap); | |
806 | else | |
807 | depopulate_section_memmap(pfn, nr_pages, altmap); | |
d41e2f3b BH |
808 | |
809 | if (empty) | |
810 | ms->section_mem_map = (unsigned long)NULL; | |
ba72b4c8 DW |
811 | } |
812 | ||
0a9f9f62 | 813 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
5d87255c | 814 | static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) |
ba72b4c8 | 815 | { |
ba72b4c8 | 816 | struct mem_section *ms = __pfn_to_section(pfn); |
5d87255c | 817 | DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; |
ba72b4c8 | 818 | unsigned long *subsection_map; |
ba72b4c8 DW |
819 | int rc = 0; |
820 | ||
821 | subsection_mask_set(map, pfn, nr_pages); | |
822 | ||
ba72b4c8 DW |
823 | subsection_map = &ms->usage->subsection_map[0]; |
824 | ||
825 | if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) | |
826 | rc = -EINVAL; | |
827 | else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) | |
828 | rc = -EEXIST; | |
829 | else | |
830 | bitmap_or(subsection_map, map, subsection_map, | |
831 | SUBSECTIONS_PER_SECTION); | |
832 | ||
5d87255c BH |
833 | return rc; |
834 | } | |
0a9f9f62 BH |
835 | #else |
836 | static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) | |
837 | { | |
838 | return 0; | |
839 | } | |
840 | #endif | |
5d87255c BH |
841 | |
842 | static struct page * __meminit section_activate(int nid, unsigned long pfn, | |
843 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
844 | { | |
845 | struct mem_section *ms = __pfn_to_section(pfn); | |
846 | struct mem_section_usage *usage = NULL; | |
847 | struct page *memmap; | |
848 | int rc = 0; | |
849 | ||
850 | if (!ms->usage) { | |
851 | usage = kzalloc(mem_section_usage_size(), GFP_KERNEL); | |
852 | if (!usage) | |
853 | return ERR_PTR(-ENOMEM); | |
854 | ms->usage = usage; | |
855 | } | |
856 | ||
857 | rc = fill_subsection_map(pfn, nr_pages); | |
ba72b4c8 DW |
858 | if (rc) { |
859 | if (usage) | |
860 | ms->usage = NULL; | |
861 | kfree(usage); | |
862 | return ERR_PTR(rc); | |
863 | } | |
864 | ||
865 | /* | |
866 | * The early init code does not consider partially populated | |
867 | * initial sections, it simply assumes that memory will never be | |
868 | * referenced. If we hot-add memory into such a section then we | |
869 | * do not need to populate the memmap and can simply reuse what | |
870 | * is already there. | |
871 | */ | |
872 | if (nr_pages < PAGES_PER_SECTION && early_section(ms)) | |
873 | return pfn_to_page(pfn); | |
874 | ||
875 | memmap = populate_section_memmap(pfn, nr_pages, nid, altmap); | |
876 | if (!memmap) { | |
877 | section_deactivate(pfn, nr_pages, altmap); | |
878 | return ERR_PTR(-ENOMEM); | |
879 | } | |
880 | ||
881 | return memmap; | |
882 | } | |
883 | ||
7567cfc5 | 884 | /** |
ba72b4c8 | 885 | * sparse_add_section - add a memory section, or populate an existing one |
7567cfc5 BH |
886 | * @nid: The node to add section on |
887 | * @start_pfn: start pfn of the memory range | |
ba72b4c8 | 888 | * @nr_pages: number of pfns to add in the section |
7567cfc5 BH |
889 | * @altmap: device page map |
890 | * | |
891 | * This is only intended for hotplug. | |
892 | * | |
95a5a34d BH |
893 | * Note that only VMEMMAP supports sub-section aligned hotplug, |
894 | * the proper alignment and size are gated by check_pfn_span(). | |
895 | * | |
896 | * | |
7567cfc5 BH |
897 | * Return: |
898 | * * 0 - On success. | |
899 | * * -EEXIST - Section has been present. | |
900 | * * -ENOMEM - Out of memory. | |
29751f69 | 901 | */ |
7ea62160 DW |
902 | int __meminit sparse_add_section(int nid, unsigned long start_pfn, |
903 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
29751f69 | 904 | { |
0b0acbec | 905 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
0b0acbec DH |
906 | struct mem_section *ms; |
907 | struct page *memmap; | |
0b0acbec | 908 | int ret; |
29751f69 | 909 | |
4e0d2e7e | 910 | ret = sparse_index_init(section_nr, nid); |
ba72b4c8 | 911 | if (ret < 0) |
bbd06825 | 912 | return ret; |
0b0acbec | 913 | |
ba72b4c8 DW |
914 | memmap = section_activate(nid, start_pfn, nr_pages, altmap); |
915 | if (IS_ERR(memmap)) | |
916 | return PTR_ERR(memmap); | |
5c0e3066 | 917 | |
d0dc12e8 PT |
918 | /* |
919 | * Poison uninitialized struct pages in order to catch invalid flags | |
920 | * combinations. | |
921 | */ | |
18e19f19 | 922 | page_init_poison(memmap, sizeof(struct page) * nr_pages); |
3ac19f8e | 923 | |
c1cbc3ee | 924 | ms = __nr_to_section(section_nr); |
26f26bed | 925 | set_section_nid(section_nr, nid); |
c4e1be9e | 926 | section_mark_present(ms); |
0b0acbec | 927 | |
ba72b4c8 DW |
928 | /* Align memmap to section boundary in the subsection case */ |
929 | if (section_nr_to_pfn(section_nr) != start_pfn) | |
4627d76d | 930 | memmap = pfn_to_page(section_nr_to_pfn(section_nr)); |
ba72b4c8 DW |
931 | sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0); |
932 | ||
933 | return 0; | |
29751f69 | 934 | } |
ea01ea93 | 935 | |
95a4774d WC |
936 | #ifdef CONFIG_MEMORY_FAILURE |
937 | static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
938 | { | |
939 | int i; | |
940 | ||
5eb570a8 BS |
941 | /* |
942 | * A further optimization is to have per section refcounted | |
943 | * num_poisoned_pages. But that would need more space per memmap, so | |
944 | * for now just do a quick global check to speed up this routine in the | |
945 | * absence of bad pages. | |
946 | */ | |
947 | if (atomic_long_read(&num_poisoned_pages) == 0) | |
948 | return; | |
949 | ||
4b94ffdc | 950 | for (i = 0; i < nr_pages; i++) { |
95a4774d | 951 | if (PageHWPoison(&memmap[i])) { |
9f82883c | 952 | num_poisoned_pages_dec(); |
95a4774d WC |
953 | ClearPageHWPoison(&memmap[i]); |
954 | } | |
955 | } | |
956 | } | |
957 | #else | |
958 | static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) | |
959 | { | |
960 | } | |
961 | #endif | |
962 | ||
ba72b4c8 | 963 | void sparse_remove_section(struct mem_section *ms, unsigned long pfn, |
7ea62160 DW |
964 | unsigned long nr_pages, unsigned long map_offset, |
965 | struct vmem_altmap *altmap) | |
ea01ea93 | 966 | { |
ba72b4c8 DW |
967 | clear_hwpoisoned_pages(pfn_to_page(pfn) + map_offset, |
968 | nr_pages - map_offset); | |
969 | section_deactivate(pfn, nr_pages, altmap); | |
ea01ea93 | 970 | } |
4edd7cef | 971 | #endif /* CONFIG_MEMORY_HOTPLUG */ |