]>
Commit | Line | Data |
---|---|---|
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> | |
2dbb51c4 | 15 | #include "internal.h" |
d41dee36 AW |
16 | |
17 | /* | |
18 | * Permanent SPARSEMEM data: | |
19 | * | |
20 | * 1) mem_section - memory sections, mem_map's for valid memory | |
21 | */ | |
3e347261 | 22 | #ifdef CONFIG_SPARSEMEM_EXTREME |
802f192e | 23 | struct mem_section *mem_section[NR_SECTION_ROOTS] |
22fc6ecc | 24 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
25 | #else |
26 | struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT] | |
22fc6ecc | 27 | ____cacheline_internodealigned_in_smp; |
3e347261 BP |
28 | #endif |
29 | EXPORT_SYMBOL(mem_section); | |
30 | ||
89689ae7 CL |
31 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
32 | /* | |
33 | * If we did not store the node number in the page then we have to | |
34 | * do a lookup in the section_to_node_table in order to find which | |
35 | * node the page belongs to. | |
36 | */ | |
37 | #if MAX_NUMNODES <= 256 | |
38 | static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
39 | #else | |
40 | static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned; | |
41 | #endif | |
42 | ||
25ba77c1 | 43 | int page_to_nid(struct page *page) |
89689ae7 CL |
44 | { |
45 | return section_to_node_table[page_to_section(page)]; | |
46 | } | |
47 | EXPORT_SYMBOL(page_to_nid); | |
85770ffe AW |
48 | |
49 | static void set_section_nid(unsigned long section_nr, int nid) | |
50 | { | |
51 | section_to_node_table[section_nr] = nid; | |
52 | } | |
53 | #else /* !NODE_NOT_IN_PAGE_FLAGS */ | |
54 | static inline void set_section_nid(unsigned long section_nr, int nid) | |
55 | { | |
56 | } | |
89689ae7 CL |
57 | #endif |
58 | ||
3e347261 | 59 | #ifdef CONFIG_SPARSEMEM_EXTREME |
577a32f6 | 60 | static struct mem_section noinline __init_refok *sparse_index_alloc(int nid) |
28ae55c9 DH |
61 | { |
62 | struct mem_section *section = NULL; | |
63 | unsigned long array_size = SECTIONS_PER_ROOT * | |
64 | sizeof(struct mem_section); | |
65 | ||
39d24e64 | 66 | if (slab_is_available()) |
46a66eec MK |
67 | section = kmalloc_node(array_size, GFP_KERNEL, nid); |
68 | else | |
69 | section = alloc_bootmem_node(NODE_DATA(nid), array_size); | |
28ae55c9 DH |
70 | |
71 | if (section) | |
72 | memset(section, 0, array_size); | |
73 | ||
74 | return section; | |
3e347261 | 75 | } |
802f192e | 76 | |
a3142c8e | 77 | static int __meminit sparse_index_init(unsigned long section_nr, int nid) |
802f192e | 78 | { |
34af946a | 79 | static DEFINE_SPINLOCK(index_init_lock); |
28ae55c9 DH |
80 | unsigned long root = SECTION_NR_TO_ROOT(section_nr); |
81 | struct mem_section *section; | |
82 | int ret = 0; | |
802f192e BP |
83 | |
84 | if (mem_section[root]) | |
28ae55c9 | 85 | return -EEXIST; |
3e347261 | 86 | |
28ae55c9 | 87 | section = sparse_index_alloc(nid); |
af0cd5a7 WC |
88 | if (!section) |
89 | return -ENOMEM; | |
28ae55c9 DH |
90 | /* |
91 | * This lock keeps two different sections from | |
92 | * reallocating for the same index | |
93 | */ | |
94 | spin_lock(&index_init_lock); | |
3e347261 | 95 | |
28ae55c9 DH |
96 | if (mem_section[root]) { |
97 | ret = -EEXIST; | |
98 | goto out; | |
99 | } | |
100 | ||
101 | mem_section[root] = section; | |
102 | out: | |
103 | spin_unlock(&index_init_lock); | |
104 | return ret; | |
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 | ||
4ca644d9 DH |
113 | /* |
114 | * Although written for the SPARSEMEM_EXTREME case, this happens | |
cd881a6b | 115 | * to also work for the flat array case because |
4ca644d9 DH |
116 | * NR_SECTION_ROOTS==NR_MEM_SECTIONS. |
117 | */ | |
118 | int __section_nr(struct mem_section* ms) | |
119 | { | |
120 | unsigned long root_nr; | |
121 | struct mem_section* root; | |
122 | ||
12783b00 MK |
123 | for (root_nr = 0; root_nr < NR_SECTION_ROOTS; root_nr++) { |
124 | root = __nr_to_section(root_nr * SECTIONS_PER_ROOT); | |
4ca644d9 DH |
125 | if (!root) |
126 | continue; | |
127 | ||
128 | if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT))) | |
129 | break; | |
130 | } | |
131 | ||
132 | return (root_nr * SECTIONS_PER_ROOT) + (ms - root); | |
133 | } | |
134 | ||
30c253e6 AW |
135 | /* |
136 | * During early boot, before section_mem_map is used for an actual | |
137 | * mem_map, we use section_mem_map to store the section's NUMA | |
138 | * node. This keeps us from having to use another data structure. The | |
139 | * node information is cleared just before we store the real mem_map. | |
140 | */ | |
141 | static inline unsigned long sparse_encode_early_nid(int nid) | |
142 | { | |
143 | return (nid << SECTION_NID_SHIFT); | |
144 | } | |
145 | ||
146 | static inline int sparse_early_nid(struct mem_section *section) | |
147 | { | |
148 | return (section->section_mem_map >> SECTION_NID_SHIFT); | |
149 | } | |
150 | ||
2dbb51c4 MG |
151 | /* Validate the physical addressing limitations of the model */ |
152 | void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
153 | unsigned long *end_pfn) | |
d41dee36 | 154 | { |
2dbb51c4 | 155 | unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); |
d41dee36 | 156 | |
bead9a3a IM |
157 | /* |
158 | * Sanity checks - do not allow an architecture to pass | |
159 | * in larger pfns than the maximum scope of sparsemem: | |
160 | */ | |
2dbb51c4 MG |
161 | if (*start_pfn > max_sparsemem_pfn) { |
162 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
163 | "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
164 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
165 | WARN_ON_ONCE(1); | |
166 | *start_pfn = max_sparsemem_pfn; | |
167 | *end_pfn = max_sparsemem_pfn; | |
168 | } | |
169 | ||
170 | if (*end_pfn > max_sparsemem_pfn) { | |
171 | mminit_dprintk(MMINIT_WARNING, "pfnvalidation", | |
172 | "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n", | |
173 | *start_pfn, *end_pfn, max_sparsemem_pfn); | |
174 | WARN_ON_ONCE(1); | |
175 | *end_pfn = max_sparsemem_pfn; | |
176 | } | |
177 | } | |
178 | ||
179 | /* Record a memory area against a node. */ | |
180 | void __init memory_present(int nid, unsigned long start, unsigned long end) | |
181 | { | |
182 | unsigned long pfn; | |
bead9a3a | 183 | |
d41dee36 | 184 | start &= PAGE_SECTION_MASK; |
2dbb51c4 | 185 | mminit_validate_memmodel_limits(&start, &end); |
d41dee36 AW |
186 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { |
187 | unsigned long section = pfn_to_section_nr(pfn); | |
802f192e BP |
188 | struct mem_section *ms; |
189 | ||
190 | sparse_index_init(section, nid); | |
85770ffe | 191 | set_section_nid(section, nid); |
802f192e BP |
192 | |
193 | ms = __nr_to_section(section); | |
194 | if (!ms->section_mem_map) | |
30c253e6 AW |
195 | ms->section_mem_map = sparse_encode_early_nid(nid) | |
196 | SECTION_MARKED_PRESENT; | |
d41dee36 AW |
197 | } |
198 | } | |
199 | ||
200 | /* | |
201 | * Only used by the i386 NUMA architecures, but relatively | |
202 | * generic code. | |
203 | */ | |
204 | unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn, | |
205 | unsigned long end_pfn) | |
206 | { | |
207 | unsigned long pfn; | |
208 | unsigned long nr_pages = 0; | |
209 | ||
2dbb51c4 | 210 | mminit_validate_memmodel_limits(&start_pfn, &end_pfn); |
d41dee36 AW |
211 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
212 | if (nid != early_pfn_to_nid(pfn)) | |
213 | continue; | |
214 | ||
540557b9 | 215 | if (pfn_present(pfn)) |
d41dee36 AW |
216 | nr_pages += PAGES_PER_SECTION; |
217 | } | |
218 | ||
219 | return nr_pages * sizeof(struct page); | |
220 | } | |
221 | ||
29751f69 AW |
222 | /* |
223 | * Subtle, we encode the real pfn into the mem_map such that | |
224 | * the identity pfn - section_mem_map will return the actual | |
225 | * physical page frame number. | |
226 | */ | |
227 | static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum) | |
228 | { | |
229 | return (unsigned long)(mem_map - (section_nr_to_pfn(pnum))); | |
230 | } | |
231 | ||
232 | /* | |
ea01ea93 | 233 | * Decode mem_map from the coded memmap |
29751f69 | 234 | */ |
29751f69 AW |
235 | struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum) |
236 | { | |
ea01ea93 BP |
237 | /* mask off the extra low bits of information */ |
238 | coded_mem_map &= SECTION_MAP_MASK; | |
29751f69 AW |
239 | return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum); |
240 | } | |
241 | ||
a3142c8e | 242 | static int __meminit sparse_init_one_section(struct mem_section *ms, |
5c0e3066 MG |
243 | unsigned long pnum, struct page *mem_map, |
244 | unsigned long *pageblock_bitmap) | |
29751f69 | 245 | { |
540557b9 | 246 | if (!present_section(ms)) |
29751f69 AW |
247 | return -EINVAL; |
248 | ||
30c253e6 | 249 | ms->section_mem_map &= ~SECTION_MAP_MASK; |
540557b9 AW |
250 | ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) | |
251 | SECTION_HAS_MEM_MAP; | |
5c0e3066 | 252 | ms->pageblock_flags = pageblock_bitmap; |
29751f69 AW |
253 | |
254 | return 1; | |
255 | } | |
256 | ||
04753278 | 257 | unsigned long usemap_size(void) |
5c0e3066 MG |
258 | { |
259 | unsigned long size_bytes; | |
260 | size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8; | |
261 | size_bytes = roundup(size_bytes, sizeof(unsigned long)); | |
262 | return size_bytes; | |
263 | } | |
264 | ||
265 | #ifdef CONFIG_MEMORY_HOTPLUG | |
266 | static unsigned long *__kmalloc_section_usemap(void) | |
267 | { | |
268 | return kmalloc(usemap_size(), GFP_KERNEL); | |
269 | } | |
270 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
271 | ||
a322f8ab | 272 | static unsigned long *__init sparse_early_usemap_alloc(unsigned long pnum) |
5c0e3066 | 273 | { |
51674644 | 274 | unsigned long *usemap; |
5c0e3066 MG |
275 | struct mem_section *ms = __nr_to_section(pnum); |
276 | int nid = sparse_early_nid(ms); | |
277 | ||
51674644 | 278 | usemap = alloc_bootmem_node(NODE_DATA(nid), usemap_size()); |
5c0e3066 MG |
279 | if (usemap) |
280 | return usemap; | |
281 | ||
282 | /* Stupid: suppress gcc warning for SPARSEMEM && !NUMA */ | |
283 | nid = 0; | |
284 | ||
d40cee24 | 285 | printk(KERN_WARNING "%s: allocation failed\n", __func__); |
5c0e3066 MG |
286 | return NULL; |
287 | } | |
288 | ||
8f6aac41 | 289 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
98f3cfc1 | 290 | struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid) |
29751f69 AW |
291 | { |
292 | struct page *map; | |
29751f69 AW |
293 | |
294 | map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION); | |
295 | if (map) | |
296 | return map; | |
297 | ||
9d99217a YG |
298 | map = alloc_bootmem_pages_node(NODE_DATA(nid), |
299 | PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION)); | |
8f6aac41 CL |
300 | return map; |
301 | } | |
302 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
303 | ||
304 | struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) | |
305 | { | |
306 | struct page *map; | |
307 | struct mem_section *ms = __nr_to_section(pnum); | |
308 | int nid = sparse_early_nid(ms); | |
309 | ||
98f3cfc1 | 310 | map = sparse_mem_map_populate(pnum, nid); |
29751f69 AW |
311 | if (map) |
312 | return map; | |
313 | ||
8f6aac41 | 314 | printk(KERN_ERR "%s: sparsemem memory map backing failed " |
d40cee24 | 315 | "some memory will not be available.\n", __func__); |
802f192e | 316 | ms->section_mem_map = 0; |
29751f69 AW |
317 | return NULL; |
318 | } | |
319 | ||
c2b91e2e YL |
320 | void __attribute__((weak)) __meminit vmemmap_populate_print_last(void) |
321 | { | |
322 | } | |
193faea9 SR |
323 | /* |
324 | * Allocate the accumulated non-linear sections, allocate a mem_map | |
325 | * for each and record the physical to section mapping. | |
326 | */ | |
327 | void __init sparse_init(void) | |
328 | { | |
329 | unsigned long pnum; | |
330 | struct page *map; | |
5c0e3066 | 331 | unsigned long *usemap; |
e123dd3f YL |
332 | unsigned long **usemap_map; |
333 | int size; | |
334 | ||
335 | /* | |
336 | * map is using big page (aka 2M in x86 64 bit) | |
337 | * usemap is less one page (aka 24 bytes) | |
338 | * so alloc 2M (with 2M align) and 24 bytes in turn will | |
339 | * make next 2M slip to one more 2M later. | |
340 | * then in big system, the memory will have a lot of holes... | |
341 | * here try to allocate 2M pages continously. | |
342 | * | |
343 | * powerpc need to call sparse_init_one_section right after each | |
344 | * sparse_early_mem_map_alloc, so allocate usemap_map at first. | |
345 | */ | |
346 | size = sizeof(unsigned long *) * NR_MEM_SECTIONS; | |
347 | usemap_map = alloc_bootmem(size); | |
348 | if (!usemap_map) | |
349 | panic("can not allocate usemap_map\n"); | |
193faea9 SR |
350 | |
351 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { | |
540557b9 | 352 | if (!present_section_nr(pnum)) |
193faea9 | 353 | continue; |
e123dd3f YL |
354 | usemap_map[pnum] = sparse_early_usemap_alloc(pnum); |
355 | } | |
193faea9 | 356 | |
e123dd3f YL |
357 | for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) { |
358 | if (!present_section_nr(pnum)) | |
193faea9 | 359 | continue; |
5c0e3066 | 360 | |
e123dd3f | 361 | usemap = usemap_map[pnum]; |
5c0e3066 MG |
362 | if (!usemap) |
363 | continue; | |
364 | ||
e123dd3f YL |
365 | map = sparse_early_mem_map_alloc(pnum); |
366 | if (!map) | |
367 | continue; | |
368 | ||
5c0e3066 MG |
369 | sparse_init_one_section(__nr_to_section(pnum), pnum, map, |
370 | usemap); | |
193faea9 | 371 | } |
e123dd3f | 372 | |
c2b91e2e YL |
373 | vmemmap_populate_print_last(); |
374 | ||
e123dd3f | 375 | free_bootmem(__pa(usemap_map), size); |
193faea9 SR |
376 | } |
377 | ||
378 | #ifdef CONFIG_MEMORY_HOTPLUG | |
98f3cfc1 YG |
379 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
380 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, | |
381 | unsigned long nr_pages) | |
382 | { | |
383 | /* This will make the necessary allocations eventually. */ | |
384 | return sparse_mem_map_populate(pnum, nid); | |
385 | } | |
386 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) | |
387 | { | |
388 | return; /* XXX: Not implemented yet */ | |
389 | } | |
0c0a4a51 YG |
390 | static void free_map_bootmem(struct page *page, unsigned long nr_pages) |
391 | { | |
392 | } | |
98f3cfc1 | 393 | #else |
0b0acbec DH |
394 | static struct page *__kmalloc_section_memmap(unsigned long nr_pages) |
395 | { | |
396 | struct page *page, *ret; | |
397 | unsigned long memmap_size = sizeof(struct page) * nr_pages; | |
398 | ||
f2d0aa5b | 399 | page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); |
0b0acbec DH |
400 | if (page) |
401 | goto got_map_page; | |
402 | ||
403 | ret = vmalloc(memmap_size); | |
404 | if (ret) | |
405 | goto got_map_ptr; | |
406 | ||
407 | return NULL; | |
408 | got_map_page: | |
409 | ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); | |
410 | got_map_ptr: | |
411 | memset(ret, 0, memmap_size); | |
412 | ||
413 | return ret; | |
414 | } | |
415 | ||
98f3cfc1 YG |
416 | static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid, |
417 | unsigned long nr_pages) | |
418 | { | |
419 | return __kmalloc_section_memmap(nr_pages); | |
420 | } | |
421 | ||
0b0acbec DH |
422 | static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages) |
423 | { | |
9e2779fa | 424 | if (is_vmalloc_addr(memmap)) |
0b0acbec DH |
425 | vfree(memmap); |
426 | else | |
427 | free_pages((unsigned long)memmap, | |
428 | get_order(sizeof(struct page) * nr_pages)); | |
429 | } | |
0c0a4a51 YG |
430 | |
431 | static void free_map_bootmem(struct page *page, unsigned long nr_pages) | |
432 | { | |
433 | unsigned long maps_section_nr, removing_section_nr, i; | |
434 | int magic; | |
435 | ||
436 | for (i = 0; i < nr_pages; i++, page++) { | |
437 | magic = atomic_read(&page->_mapcount); | |
438 | ||
439 | BUG_ON(magic == NODE_INFO); | |
440 | ||
441 | maps_section_nr = pfn_to_section_nr(page_to_pfn(page)); | |
442 | removing_section_nr = page->private; | |
443 | ||
444 | /* | |
445 | * When this function is called, the removing section is | |
446 | * logical offlined state. This means all pages are isolated | |
447 | * from page allocator. If removing section's memmap is placed | |
448 | * on the same section, it must not be freed. | |
449 | * If it is freed, page allocator may allocate it which will | |
450 | * be removed physically soon. | |
451 | */ | |
452 | if (maps_section_nr != removing_section_nr) | |
453 | put_page_bootmem(page); | |
454 | } | |
455 | } | |
98f3cfc1 | 456 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
0b0acbec | 457 | |
ea01ea93 BP |
458 | static void free_section_usemap(struct page *memmap, unsigned long *usemap) |
459 | { | |
0c0a4a51 YG |
460 | struct page *usemap_page; |
461 | unsigned long nr_pages; | |
462 | ||
ea01ea93 BP |
463 | if (!usemap) |
464 | return; | |
465 | ||
0c0a4a51 | 466 | usemap_page = virt_to_page(usemap); |
ea01ea93 BP |
467 | /* |
468 | * Check to see if allocation came from hot-plug-add | |
469 | */ | |
0c0a4a51 | 470 | if (PageSlab(usemap_page)) { |
ea01ea93 BP |
471 | kfree(usemap); |
472 | if (memmap) | |
473 | __kfree_section_memmap(memmap, PAGES_PER_SECTION); | |
474 | return; | |
475 | } | |
476 | ||
477 | /* | |
0c0a4a51 YG |
478 | * The usemap came from bootmem. This is packed with other usemaps |
479 | * on the section which has pgdat at boot time. Just keep it as is now. | |
ea01ea93 | 480 | */ |
0c0a4a51 YG |
481 | |
482 | if (memmap) { | |
483 | struct page *memmap_page; | |
484 | memmap_page = virt_to_page(memmap); | |
485 | ||
486 | nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page)) | |
487 | >> PAGE_SHIFT; | |
488 | ||
489 | free_map_bootmem(memmap_page, nr_pages); | |
490 | } | |
ea01ea93 BP |
491 | } |
492 | ||
29751f69 AW |
493 | /* |
494 | * returns the number of sections whose mem_maps were properly | |
495 | * set. If this is <=0, then that means that the passed-in | |
496 | * map was not consumed and must be freed. | |
497 | */ | |
0b0acbec DH |
498 | int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, |
499 | int nr_pages) | |
29751f69 | 500 | { |
0b0acbec DH |
501 | unsigned long section_nr = pfn_to_section_nr(start_pfn); |
502 | struct pglist_data *pgdat = zone->zone_pgdat; | |
503 | struct mem_section *ms; | |
504 | struct page *memmap; | |
5c0e3066 | 505 | unsigned long *usemap; |
0b0acbec DH |
506 | unsigned long flags; |
507 | int ret; | |
29751f69 | 508 | |
0b0acbec DH |
509 | /* |
510 | * no locking for this, because it does its own | |
511 | * plus, it does a kmalloc | |
512 | */ | |
bbd06825 WC |
513 | ret = sparse_index_init(section_nr, pgdat->node_id); |
514 | if (ret < 0 && ret != -EEXIST) | |
515 | return ret; | |
98f3cfc1 | 516 | memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages); |
bbd06825 WC |
517 | if (!memmap) |
518 | return -ENOMEM; | |
5c0e3066 | 519 | usemap = __kmalloc_section_usemap(); |
bbd06825 WC |
520 | if (!usemap) { |
521 | __kfree_section_memmap(memmap, nr_pages); | |
522 | return -ENOMEM; | |
523 | } | |
0b0acbec DH |
524 | |
525 | pgdat_resize_lock(pgdat, &flags); | |
29751f69 | 526 | |
0b0acbec DH |
527 | ms = __pfn_to_section(start_pfn); |
528 | if (ms->section_mem_map & SECTION_MARKED_PRESENT) { | |
529 | ret = -EEXIST; | |
530 | goto out; | |
531 | } | |
5c0e3066 | 532 | |
29751f69 AW |
533 | ms->section_mem_map |= SECTION_MARKED_PRESENT; |
534 | ||
5c0e3066 | 535 | ret = sparse_init_one_section(ms, section_nr, memmap, usemap); |
0b0acbec | 536 | |
0b0acbec DH |
537 | out: |
538 | pgdat_resize_unlock(pgdat, &flags); | |
bbd06825 WC |
539 | if (ret <= 0) { |
540 | kfree(usemap); | |
46a66eec | 541 | __kfree_section_memmap(memmap, nr_pages); |
bbd06825 | 542 | } |
0b0acbec | 543 | return ret; |
29751f69 | 544 | } |
ea01ea93 BP |
545 | |
546 | void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) | |
547 | { | |
548 | struct page *memmap = NULL; | |
549 | unsigned long *usemap = NULL; | |
550 | ||
551 | if (ms->section_mem_map) { | |
552 | usemap = ms->pageblock_flags; | |
553 | memmap = sparse_decode_mem_map(ms->section_mem_map, | |
554 | __section_nr(ms)); | |
555 | ms->section_mem_map = 0; | |
556 | ms->pageblock_flags = NULL; | |
557 | } | |
558 | ||
559 | free_section_usemap(memmap, usemap); | |
560 | } | |
a3142c8e | 561 | #endif |