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Commit | Line | Data |
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d41dee36 AW |
1 | /* |
2 | * sparse memory mappings. | |
3 | */ | |
d41dee36 AW |
4 | #include <linux/mm.h> |
5 | #include <linux/mmzone.h> | |
6 | #include <linux/bootmem.h> | |
0b0acbec | 7 | #include <linux/highmem.h> |
d41dee36 | 8 | #include <linux/module.h> |
28ae55c9 | 9 | #include <linux/spinlock.h> |
0b0acbec | 10 | #include <linux/vmalloc.h> |
0c0a4a51 | 11 | #include "internal.h" |
d41dee36 | 12 | #include <asm/dma.h> |
8f6aac41 CL |
13 | #include <asm/pgalloc.h> |
14 | #include <asm/pgtable.h> | |
d41dee36 AW |
15 | |
16 | /* | |
17 | * Permanent SPARSEMEM data: | |
18 | * | |
19 | * 1) mem_section - memory sections, mem_map's for valid memory | |
20 | */ | |
3e347261 | 21 | #ifdef CONFIG_SPARSEMEM_EXTREME |
802f192e | 22 | struct mem_section *mem_section[NR_SECTION_ROOTS] |
22fc6ecc | 23 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
24 | #else |
25 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 26 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
27 | #endif |
28 | EXPORT_SYMBOL(mem_section); | |
29 | ||
89689ae7 CL |
30 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
31 | /* | |
32 | * If we did not store the node number in the page then we have to | |
33 | * do a lookup in the section_to_node_table in order to find which | |
34 | * node the page belongs to. | |
35 | */ | |
36 | #if MAX_NUMNODES <= 256 | |
37 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
38 | #else | |
39 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
40 | #endif | |
41 | ||
25ba77c1 | 42 | int page_to_nid(struct page *page) |
89689ae7 CL |
43 | { |
44 | return section_to_node_table[page_to_section(page)]; | |
45 | } | |
46 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
47 | |
48 | static void set_section_nid(unsigned long section_nr, int nid) | |
49 | { | |
50 | section_to_node_table[section_nr] = nid; | |
51 | } | |
52 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
53 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
54 | { | |
55 | } | |
89689ae7 CL |
56 | #endif |
57 | ||
3e347261 | 58 | #ifdef CONFIG_SPARSEMEM_EXTREME |
577a32f6 | 59 | static struct mem_section noinline __init_refok *sparse_index_alloc(int nid) |
28ae55c9 DH |
60 | { |
61 | struct mem_section *section = NULL; | |
62 | unsigned long array_size = SECTIONS_PER_ROOT * | |
63 | sizeof(struct mem_section); | |
64 | ||
39d24e64 | 65 | if (slab_is_available()) |
46a66eec MK |
66 | section = kmalloc_node(array_size, GFP_KERNEL, nid); |
67 | else | |
68 | section = alloc_bootmem_node(NODE_DATA(nid), array_size); | |
28ae55c9 DH |
69 | |
70 | if (section) | |
71 | memset(section, 0, array_size); | |
72 | ||
73 | return section; | |
3e347261 | 74 | } |
802f192e | 75 | |
a3142c8e | 76 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 77 | { |
34af946a | 78 | static DEFINE_SPINLOCK(index_init_lock); |
28ae55c9 DH |
79 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
80 | struct mem_section *section; | |
81 | int ret = 0; | |
802f192e BP |
82 | |
83 | if (mem_section[root]) | |
28ae55c9 | 84 | return -EEXIST; |
3e347261 | 85 | |
28ae55c9 | 86 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
87 | if (!section) |
88 | return -ENOMEM; | |
28ae55c9 DH |
89 | /* |
90 | * This lock keeps two different sections from | |
91 | * reallocating for the same index | |
92 | */ | |
93 | spin_lock(&index_init_lock); | |
3e347261 | 94 | |
28ae55c9 DH |
95 | if (mem_section[root]) { |
96 | ret = -EEXIST; | |
97 | goto out; | |
98 | } | |
99 | ||
100 | mem_section[root] = section; | |
101 | out: | |
102 | spin_unlock(&index_init_lock); | |
103 | return ret; | |
104 | } | |
105 | #else /* !SPARSEMEM_EXTREME */ | |
106 | static inline int sparse_index_init(unsigned long section_nr, int nid) | |
107 | { | |
108 | return 0; | |
802f192e | 109 | } |
28ae55c9 DH |
110 | #endif |
111 | ||
4ca644d9 DH |
112 | /* |
113 | * Although written for the SPARSEMEM_EXTREME case, this happens | |
cd881a6b | 114 | * to also work for the flat array case because |
4ca644d9 DH |
115 | * NR_SECTION_ROOTS==NR_MEM_SECTIONS. |
116 | */ | |
117 | int __section_nr(struct mem_section* ms) | |
118 | { | |
119 | unsigned long root_nr; | |
120 | struct mem_section* root; | |
121 | ||
12783b00 MK |
122 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
123 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
124 | if (!root) |
125 | continue; | |
126 | ||
127 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
128 | break; | |
129 | } | |
130 | ||
131 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); | |
132 | } | |
133 | ||
30c253e6 AW |
134 | /* |
135 | * During early boot, before section_mem_map is used for an actual | |
136 | * mem_map, we use section_mem_map to store the section's NUMA | |
137 | * node. This keeps us from having to use another data structure. The | |
138 | * node information is cleared just before we store the real mem_map. | |
139 | */ | |
140 | static inline unsigned long sparse_encode_early_nid(int nid) | |
141 | { | |
142 | return (nid << SECTION_NID_SHIFT); | |
143 | } | |
144 | ||
145 | static inline int sparse_early_nid(struct mem_section *section) | |
146 | { | |
147 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
148 | } | |
149 | ||
d41dee36 | 150 | /* Record a memory area against a node. */ |
a3142c8e | 151 | void __init memory_present(int nid, unsigned long start, unsigned long end) |
d41dee36 | 152 | { |
bead9a3a | 153 | unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 AW |
154 | unsigned long pfn; |
155 | ||
bead9a3a IM |
156 | /* |
157 | * Sanity checks - do not allow an architecture to pass | |
158 | * in larger pfns than the maximum scope of sparsemem: | |
159 | */ | |
160 | if (start >= max_arch_pfn) | |
161 | return; | |
162 | if (end >= max_arch_pfn) | |
163 | end = max_arch_pfn; | |
164 | ||
d41dee36 AW |
165 | start &= PAGE_SECTION_MASK; |
166 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { | |
167 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
168 | struct mem_section *ms; |
169 | ||
170 | sparse_index_init(section, nid); | |
85770ffe | 171 | set_section_nid(section, nid); |
802f192e BP |
172 | |
173 | ms = __nr_to_section(section); | |
174 | if (!ms->section_mem_map) | |
30c253e6 AW |
175 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
176 | SECTION_MARKED_PRESENT; | |
d41dee36 AW |
177 | } |
178 | } | |
179 | ||
180 | /* | |
181 | * Only used by the i386 NUMA architecures, but relatively | |
182 | * generic code. | |
183 | */ | |
184 | unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, | |
185 | unsigned long end_pfn) | |
186 | { | |
187 | unsigned long pfn; | |
188 | unsigned long nr_pages = 0; | |
189 | ||
190 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
191 | if (nid != early_pfn_to_nid(pfn)) | |
192 | continue; | |
193 | ||
540557b9 | 194 | if (pfn_present(pfn)) |
d41dee36 AW |
195 | nr_pages += PAGES_PER_SECTION; |
196 | } | |
197 | ||
198 | return nr_pages * sizeof(struct page); | |
199 | } | |
200 | ||
29751f69 AW |
201 | /* |
202 | * Subtle, we encode the real pfn into the mem_map such that | |
203 | * the identity pfn - section_mem_map will return the actual | |
204 | * physical page frame number. | |
205 | */ | |
206 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
207 | { | |
208 | return (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
209 | } | |
210 | ||
211 | /* | |
ea01ea93 | 212 | * Decode mem_map from the coded memmap |
29751f69 | 213 | */ |
29751f69 AW |
214 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
215 | { | |
ea01ea93 BP |
216 | /* mask off the extra low bits of information */ |
217 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
218 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
219 | } | |
220 | ||
a3142c8e | 221 | static int __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 MG |
222 | unsigned long pnum, struct page *mem_map, |
223 | unsigned long *pageblock_bitmap) | |
29751f69 | 224 | { |
540557b9 | 225 | if (!present_section(ms)) |
29751f69 AW |
226 | return -EINVAL; |
227 | ||
30c253e6 | 228 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
540557b9 AW |
229 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | |
230 | SECTION_HAS_MEM_MAP; | |
5c0e3066 | 231 | ms->pageblock_flags = pageblock_bitmap; |
29751f69 AW |
232 | |
233 | return 1; | |
234 | } | |
235 | ||
04753278 | 236 | unsigned long usemap_size(void) |
5c0e3066 MG |
237 | { |
238 | unsigned long size_bytes; | |
239 | size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8; | |
240 | size_bytes = roundup(size_bytes, sizeof(unsigned long)); | |
241 | return size_bytes; | |
242 | } | |
243 | ||
244 | #ifdef CONFIG_MEMORY_HOTPLUG | |
245 | static unsigned long *__kmalloc_section_usemap(void) | |
246 | { | |
247 | return kmalloc(usemap_size(), GFP_KERNEL); | |
248 | } | |
249 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
250 | ||
a322f8ab | 251 | static unsigned long *__init sparse_early_usemap_alloc(unsigned long pnum) |
5c0e3066 | 252 | { |
86f6dae1 | 253 | unsigned long *usemap, section_nr; |
5c0e3066 MG |
254 | struct mem_section *ms = __nr_to_section(pnum); |
255 | int nid = sparse_early_nid(ms); | |
86f6dae1 | 256 | struct pglist_data *pgdat = NODE_DATA(nid); |
5c0e3066 | 257 | |
86f6dae1 YG |
258 | /* |
259 | * Usemap's page can't be freed until freeing other sections | |
260 | * which use it. And, Pgdat has same feature. | |
261 | * If section A has pgdat and section B has usemap for other | |
262 | * sections (includes section A), both sections can't be removed, | |
263 | * because there is the dependency each other. | |
264 | * To solve above issue, this collects all usemap on the same section | |
265 | * which has pgdat. | |
266 | */ | |
267 | section_nr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT); | |
268 | usemap = alloc_bootmem_section(usemap_size(), section_nr); | |
5c0e3066 MG |
269 | if (usemap) |
270 | return usemap; | |
271 | ||
272 | /* Stupid: suppress gcc warning for SPARSEMEM && !NUMA */ | |
273 | nid = 0; | |
274 | ||
275 | printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__); | |
276 | return NULL; | |
277 | } | |
278 | ||
8f6aac41 | 279 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
98f3cfc1 | 280 | struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid) |
29751f69 AW |
281 | { |
282 | struct page *map; | |
29751f69 AW |
283 | |
284 | map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION); | |
285 | if (map) | |
286 | return map; | |
287 | ||
9d99217a YG |
288 | map = alloc_bootmem_pages_node(NODE_DATA(nid), |
289 | PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION)); | |
8f6aac41 CL |
290 | return map; |
291 | } | |
292 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
293 | ||
294 | struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) | |
295 | { | |
296 | struct page *map; | |
297 | struct mem_section *ms = __nr_to_section(pnum); | |
298 | int nid = sparse_early_nid(ms); | |
299 | ||
98f3cfc1 | 300 | map = sparse_mem_map_populate(pnum, nid); |
29751f69 AW |
301 | if (map) |
302 | return map; | |
303 | ||
8f6aac41 CL |
304 | printk(KERN_ERR "%s: sparsemem memory map backing failed " |
305 | "some memory will not be available.\n", __FUNCTION__); | |
802f192e | 306 | ms->section_mem_map = 0; |
29751f69 AW |
307 | return NULL; |
308 | } | |
309 | ||
c2b91e2e YL |
310 | void __attribute__((weak)) __meminit vmemmap_populate_print_last(void) |
311 | { | |
312 | } | |
193faea9 SR |
313 | /* |
314 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
315 | * for each and record the physical to section mapping. | |
316 | */ | |
317 | void __init sparse_init(void) | |
318 | { | |
319 | unsigned long pnum; | |
320 | struct page *map; | |
5c0e3066 | 321 | unsigned long *usemap; |
e123dd3f YL |
322 | unsigned long **usemap_map; |
323 | int size; | |
324 | ||
325 | /* | |
326 | * map is using big page (aka 2M in x86 64 bit) | |
327 | * usemap is less one page (aka 24 bytes) | |
328 | * so alloc 2M (with 2M align) and 24 bytes in turn will | |
329 | * make next 2M slip to one more 2M later. | |
330 | * then in big system, the memory will have a lot of holes... | |
331 | * here try to allocate 2M pages continously. | |
332 | * | |
333 | * powerpc need to call sparse_init_one_section right after each | |
334 | * sparse_early_mem_map_alloc, so allocate usemap_map at first. | |
335 | */ | |
336 | size = sizeof(unsigned long *) * NR_MEM_SECTIONS; | |
337 | usemap_map = alloc_bootmem(size); | |
338 | if (!usemap_map) | |
339 | panic("can not allocate usemap_map\n"); | |
193faea9 SR |
340 | |
341 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { | |
540557b9 | 342 | if (!present_section_nr(pnum)) |
193faea9 | 343 | continue; |
e123dd3f YL |
344 | usemap_map[pnum] = sparse_early_usemap_alloc(pnum); |
345 | } | |
193faea9 | 346 | |
e123dd3f YL |
347 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
348 | if (!present_section_nr(pnum)) | |
193faea9 | 349 | continue; |
5c0e3066 | 350 | |
e123dd3f | 351 | usemap = usemap_map[pnum]; |
5c0e3066 MG |
352 | if (!usemap) |
353 | continue; | |
354 | ||
e123dd3f YL |
355 | map = sparse_early_mem_map_alloc(pnum); |
356 | if (!map) | |
357 | continue; | |
358 | ||
5c0e3066 MG |
359 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, |
360 | usemap); | |
193faea9 | 361 | } |
e123dd3f | 362 | |
c2b91e2e YL |
363 | vmemmap_populate_print_last(); |
364 | ||
e123dd3f | 365 | free_bootmem(__pa(usemap_map), size); |
193faea9 SR |
366 | } |
367 | ||
368 | #ifdef CONFIG_MEMORY_HOTPLUG | |
98f3cfc1 YG |
369 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
370 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, | |
371 | unsigned long nr_pages) | |
372 | { | |
373 | /* This will make the necessary allocations eventually. */ | |
374 | return sparse_mem_map_populate(pnum, nid); | |
375 | } | |
376 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) | |
377 | { | |
378 | return; /* XXX: Not implemented yet */ | |
379 | } | |
0c0a4a51 YG |
380 | static void free_map_bootmem(struct page *page, unsigned long nr_pages) |
381 | { | |
382 | } | |
98f3cfc1 | 383 | #else |
0b0acbec DH |
384 | static struct page *__kmalloc_section_memmap(unsigned long nr_pages) |
385 | { | |
386 | struct page *page, *ret; | |
387 | unsigned long memmap_size = sizeof(struct page) * nr_pages; | |
388 | ||
f2d0aa5b | 389 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
390 | if (page) |
391 | goto got_map_page; | |
392 | ||
393 | ret = vmalloc(memmap_size); | |
394 | if (ret) | |
395 | goto got_map_ptr; | |
396 | ||
397 | return NULL; | |
398 | got_map_page: | |
399 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
400 | got_map_ptr: | |
401 | memset(ret, 0, memmap_size); | |
402 | ||
403 | return ret; | |
404 | } | |
405 | ||
98f3cfc1 YG |
406 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, |
407 | unsigned long nr_pages) | |
408 | { | |
409 | return __kmalloc_section_memmap(nr_pages); | |
410 | } | |
411 | ||
0b0acbec DH |
412 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) |
413 | { | |
9e2779fa | 414 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
415 | vfree(memmap); |
416 | else | |
417 | free_pages((unsigned long)memmap, | |
418 | get_order(sizeof(struct page) * nr_pages)); | |
419 | } | |
0c0a4a51 YG |
420 | |
421 | static void free_map_bootmem(struct page *page, unsigned long nr_pages) | |
422 | { | |
423 | unsigned long maps_section_nr, removing_section_nr, i; | |
424 | int magic; | |
425 | ||
426 | for (i = 0; i < nr_pages; i++, page++) { | |
427 | magic = atomic_read(&page->_mapcount); | |
428 | ||
429 | BUG_ON(magic == NODE_INFO); | |
430 | ||
431 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
432 | removing_section_nr = page->private; | |
433 | ||
434 | /* | |
435 | * When this function is called, the removing section is | |
436 | * logical offlined state. This means all pages are isolated | |
437 | * from page allocator. If removing section's memmap is placed | |
438 | * on the same section, it must not be freed. | |
439 | * If it is freed, page allocator may allocate it which will | |
440 | * be removed physically soon. | |
441 | */ | |
442 | if (maps_section_nr != removing_section_nr) | |
443 | put_page_bootmem(page); | |
444 | } | |
445 | } | |
98f3cfc1 | 446 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 447 | |
ea01ea93 BP |
448 | static void free_section_usemap(struct page *memmap, unsigned long *usemap) |
449 | { | |
0c0a4a51 YG |
450 | struct page *usemap_page; |
451 | unsigned long nr_pages; | |
452 | ||
ea01ea93 BP |
453 | if (!usemap) |
454 | return; | |
455 | ||
0c0a4a51 | 456 | usemap_page = virt_to_page(usemap); |
ea01ea93 BP |
457 | /* |
458 | * Check to see if allocation came from hot-plug-add | |
459 | */ | |
0c0a4a51 | 460 | if (PageSlab(usemap_page)) { |
ea01ea93 BP |
461 | kfree(usemap); |
462 | if (memmap) | |
463 | __kfree_section_memmap(memmap, PAGES_PER_SECTION); | |
464 | return; | |
465 | } | |
466 | ||
467 | /* | |
0c0a4a51 YG |
468 | * The usemap came from bootmem. This is packed with other usemaps |
469 | * on the section which has pgdat at boot time. Just keep it as is now. | |
ea01ea93 | 470 | */ |
0c0a4a51 YG |
471 | |
472 | if (memmap) { | |
473 | struct page *memmap_page; | |
474 | memmap_page = virt_to_page(memmap); | |
475 | ||
476 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) | |
477 | >> PAGE_SHIFT; | |
478 | ||
479 | free_map_bootmem(memmap_page, nr_pages); | |
480 | } | |
ea01ea93 BP |
481 | } |
482 | ||
29751f69 AW |
483 | /* |
484 | * returns the number of sections whose mem_maps were properly | |
485 | * set. If this is <=0, then that means that the passed-in | |
486 | * map was not consumed and must be freed. | |
487 | */ | |
0b0acbec DH |
488 | int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
489 | int nr_pages) | |
29751f69 | 490 | { |
0b0acbec DH |
491 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
492 | struct pglist_data *pgdat = zone->zone_pgdat; | |
493 | struct mem_section *ms; | |
494 | struct page *memmap; | |
5c0e3066 | 495 | unsigned long *usemap; |
0b0acbec DH |
496 | unsigned long flags; |
497 | int ret; | |
29751f69 | 498 | |
0b0acbec DH |
499 | /* |
500 | * no locking for this, because it does its own | |
501 | * plus, it does a kmalloc | |
502 | */ | |
bbd06825 WC |
503 | ret = sparse_index_init(section_nr, pgdat->node_id); |
504 | if (ret < 0 && ret != -EEXIST) | |
505 | return ret; | |
98f3cfc1 | 506 | memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages); |
bbd06825 WC |
507 | if (!memmap) |
508 | return -ENOMEM; | |
5c0e3066 | 509 | usemap = __kmalloc_section_usemap(); |
bbd06825 WC |
510 | if (!usemap) { |
511 | __kfree_section_memmap(memmap, nr_pages); | |
512 | return -ENOMEM; | |
513 | } | |
0b0acbec DH |
514 | |
515 | pgdat_resize_lock(pgdat, &flags); | |
29751f69 | 516 | |
0b0acbec DH |
517 | ms = __pfn_to_section(start_pfn); |
518 | if (ms->section_mem_map & SECTION_MARKED_PRESENT) { | |
519 | ret = -EEXIST; | |
520 | goto out; | |
521 | } | |
5c0e3066 | 522 | |
29751f69 AW |
523 | ms->section_mem_map |= SECTION_MARKED_PRESENT; |
524 | ||
5c0e3066 | 525 | ret = sparse_init_one_section(ms, section_nr, memmap, usemap); |
0b0acbec | 526 | |
0b0acbec DH |
527 | out: |
528 | pgdat_resize_unlock(pgdat, &flags); | |
bbd06825 WC |
529 | if (ret <= 0) { |
530 | kfree(usemap); | |
46a66eec | 531 | __kfree_section_memmap(memmap, nr_pages); |
bbd06825 | 532 | } |
0b0acbec | 533 | return ret; |
29751f69 | 534 | } |
ea01ea93 BP |
535 | |
536 | void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) | |
537 | { | |
538 | struct page *memmap = NULL; | |
539 | unsigned long *usemap = NULL; | |
540 | ||
541 | if (ms->section_mem_map) { | |
542 | usemap = ms->pageblock_flags; | |
543 | memmap = sparse_decode_mem_map(ms->section_mem_map, | |
544 | __section_nr(ms)); | |
545 | ms->section_mem_map = 0; | |
546 | ms->pageblock_flags = NULL; | |
547 | } | |
548 | ||
549 | free_section_usemap(memmap, usemap); | |
550 | } | |
a3142c8e | 551 | #endif |