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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic hugetlb support. | |
3 | * (C) William Irwin, April 2004 | |
4 | */ | |
5 | #include <linux/gfp.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/mm.h> | |
1da177e4 LT |
10 | #include <linux/sysctl.h> |
11 | #include <linux/highmem.h> | |
12 | #include <linux/nodemask.h> | |
63551ae0 | 13 | #include <linux/pagemap.h> |
5da7ca86 CL |
14 | #include <linux/mempolicy.h> |
15 | ||
63551ae0 DG |
16 | #include <asm/page.h> |
17 | #include <asm/pgtable.h> | |
18 | ||
19 | #include <linux/hugetlb.h> | |
1da177e4 LT |
20 | |
21 | const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL; | |
22 | static unsigned long nr_huge_pages, free_huge_pages; | |
23 | unsigned long max_huge_pages; | |
24 | static struct list_head hugepage_freelists[MAX_NUMNODES]; | |
25 | static unsigned int nr_huge_pages_node[MAX_NUMNODES]; | |
26 | static unsigned int free_huge_pages_node[MAX_NUMNODES]; | |
0bd0f9fb EP |
27 | |
28 | /* | |
29 | * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages | |
30 | */ | |
1da177e4 LT |
31 | static DEFINE_SPINLOCK(hugetlb_lock); |
32 | ||
33 | static void enqueue_huge_page(struct page *page) | |
34 | { | |
35 | int nid = page_to_nid(page); | |
36 | list_add(&page->lru, &hugepage_freelists[nid]); | |
37 | free_huge_pages++; | |
38 | free_huge_pages_node[nid]++; | |
39 | } | |
40 | ||
5da7ca86 CL |
41 | static struct page *dequeue_huge_page(struct vm_area_struct *vma, |
42 | unsigned long address) | |
1da177e4 LT |
43 | { |
44 | int nid = numa_node_id(); | |
45 | struct page *page = NULL; | |
5da7ca86 | 46 | struct zonelist *zonelist = huge_zonelist(vma, address); |
96df9333 | 47 | struct zone **z; |
1da177e4 | 48 | |
96df9333 CL |
49 | for (z = zonelist->zones; *z; z++) { |
50 | nid = (*z)->zone_pgdat->node_id; | |
51 | if (!list_empty(&hugepage_freelists[nid])) | |
52 | break; | |
1da177e4 | 53 | } |
96df9333 CL |
54 | |
55 | if (*z) { | |
1da177e4 LT |
56 | page = list_entry(hugepage_freelists[nid].next, |
57 | struct page, lru); | |
58 | list_del(&page->lru); | |
59 | free_huge_pages--; | |
60 | free_huge_pages_node[nid]--; | |
61 | } | |
62 | return page; | |
63 | } | |
64 | ||
65 | static struct page *alloc_fresh_huge_page(void) | |
66 | { | |
67 | static int nid = 0; | |
68 | struct page *page; | |
69 | page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN, | |
70 | HUGETLB_PAGE_ORDER); | |
71 | nid = (nid + 1) % num_online_nodes(); | |
72 | if (page) { | |
0bd0f9fb | 73 | spin_lock(&hugetlb_lock); |
1da177e4 LT |
74 | nr_huge_pages++; |
75 | nr_huge_pages_node[page_to_nid(page)]++; | |
0bd0f9fb | 76 | spin_unlock(&hugetlb_lock); |
1da177e4 LT |
77 | } |
78 | return page; | |
79 | } | |
80 | ||
81 | void free_huge_page(struct page *page) | |
82 | { | |
83 | BUG_ON(page_count(page)); | |
84 | ||
85 | INIT_LIST_HEAD(&page->lru); | |
86 | page[1].mapping = NULL; | |
87 | ||
88 | spin_lock(&hugetlb_lock); | |
89 | enqueue_huge_page(page); | |
90 | spin_unlock(&hugetlb_lock); | |
91 | } | |
92 | ||
5da7ca86 | 93 | struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr) |
1da177e4 LT |
94 | { |
95 | struct page *page; | |
96 | int i; | |
97 | ||
98 | spin_lock(&hugetlb_lock); | |
5da7ca86 | 99 | page = dequeue_huge_page(vma, addr); |
1da177e4 LT |
100 | if (!page) { |
101 | spin_unlock(&hugetlb_lock); | |
102 | return NULL; | |
103 | } | |
104 | spin_unlock(&hugetlb_lock); | |
105 | set_page_count(page, 1); | |
106 | page[1].mapping = (void *)free_huge_page; | |
107 | for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i) | |
108 | clear_highpage(&page[i]); | |
109 | return page; | |
110 | } | |
111 | ||
112 | static int __init hugetlb_init(void) | |
113 | { | |
114 | unsigned long i; | |
115 | struct page *page; | |
116 | ||
3c726f8d BH |
117 | if (HPAGE_SHIFT == 0) |
118 | return 0; | |
119 | ||
1da177e4 LT |
120 | for (i = 0; i < MAX_NUMNODES; ++i) |
121 | INIT_LIST_HEAD(&hugepage_freelists[i]); | |
122 | ||
123 | for (i = 0; i < max_huge_pages; ++i) { | |
124 | page = alloc_fresh_huge_page(); | |
125 | if (!page) | |
126 | break; | |
127 | spin_lock(&hugetlb_lock); | |
128 | enqueue_huge_page(page); | |
129 | spin_unlock(&hugetlb_lock); | |
130 | } | |
131 | max_huge_pages = free_huge_pages = nr_huge_pages = i; | |
132 | printk("Total HugeTLB memory allocated, %ld\n", free_huge_pages); | |
133 | return 0; | |
134 | } | |
135 | module_init(hugetlb_init); | |
136 | ||
137 | static int __init hugetlb_setup(char *s) | |
138 | { | |
139 | if (sscanf(s, "%lu", &max_huge_pages) <= 0) | |
140 | max_huge_pages = 0; | |
141 | return 1; | |
142 | } | |
143 | __setup("hugepages=", hugetlb_setup); | |
144 | ||
145 | #ifdef CONFIG_SYSCTL | |
146 | static void update_and_free_page(struct page *page) | |
147 | { | |
148 | int i; | |
149 | nr_huge_pages--; | |
150 | nr_huge_pages_node[page_zone(page)->zone_pgdat->node_id]--; | |
151 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) { | |
152 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | | |
153 | 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved | | |
154 | 1 << PG_private | 1<< PG_writeback); | |
155 | set_page_count(&page[i], 0); | |
156 | } | |
157 | set_page_count(page, 1); | |
158 | __free_pages(page, HUGETLB_PAGE_ORDER); | |
159 | } | |
160 | ||
161 | #ifdef CONFIG_HIGHMEM | |
162 | static void try_to_free_low(unsigned long count) | |
163 | { | |
164 | int i, nid; | |
165 | for (i = 0; i < MAX_NUMNODES; ++i) { | |
166 | struct page *page, *next; | |
167 | list_for_each_entry_safe(page, next, &hugepage_freelists[i], lru) { | |
168 | if (PageHighMem(page)) | |
169 | continue; | |
170 | list_del(&page->lru); | |
171 | update_and_free_page(page); | |
172 | nid = page_zone(page)->zone_pgdat->node_id; | |
173 | free_huge_pages--; | |
174 | free_huge_pages_node[nid]--; | |
175 | if (count >= nr_huge_pages) | |
176 | return; | |
177 | } | |
178 | } | |
179 | } | |
180 | #else | |
181 | static inline void try_to_free_low(unsigned long count) | |
182 | { | |
183 | } | |
184 | #endif | |
185 | ||
186 | static unsigned long set_max_huge_pages(unsigned long count) | |
187 | { | |
188 | while (count > nr_huge_pages) { | |
189 | struct page *page = alloc_fresh_huge_page(); | |
190 | if (!page) | |
191 | return nr_huge_pages; | |
192 | spin_lock(&hugetlb_lock); | |
193 | enqueue_huge_page(page); | |
194 | spin_unlock(&hugetlb_lock); | |
195 | } | |
196 | if (count >= nr_huge_pages) | |
197 | return nr_huge_pages; | |
198 | ||
199 | spin_lock(&hugetlb_lock); | |
200 | try_to_free_low(count); | |
201 | while (count < nr_huge_pages) { | |
5da7ca86 | 202 | struct page *page = dequeue_huge_page(NULL, 0); |
1da177e4 LT |
203 | if (!page) |
204 | break; | |
205 | update_and_free_page(page); | |
206 | } | |
207 | spin_unlock(&hugetlb_lock); | |
208 | return nr_huge_pages; | |
209 | } | |
210 | ||
211 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, | |
212 | struct file *file, void __user *buffer, | |
213 | size_t *length, loff_t *ppos) | |
214 | { | |
215 | proc_doulongvec_minmax(table, write, file, buffer, length, ppos); | |
216 | max_huge_pages = set_max_huge_pages(max_huge_pages); | |
217 | return 0; | |
218 | } | |
219 | #endif /* CONFIG_SYSCTL */ | |
220 | ||
221 | int hugetlb_report_meminfo(char *buf) | |
222 | { | |
223 | return sprintf(buf, | |
224 | "HugePages_Total: %5lu\n" | |
225 | "HugePages_Free: %5lu\n" | |
226 | "Hugepagesize: %5lu kB\n", | |
227 | nr_huge_pages, | |
228 | free_huge_pages, | |
229 | HPAGE_SIZE/1024); | |
230 | } | |
231 | ||
232 | int hugetlb_report_node_meminfo(int nid, char *buf) | |
233 | { | |
234 | return sprintf(buf, | |
235 | "Node %d HugePages_Total: %5u\n" | |
236 | "Node %d HugePages_Free: %5u\n", | |
237 | nid, nr_huge_pages_node[nid], | |
238 | nid, free_huge_pages_node[nid]); | |
239 | } | |
240 | ||
241 | int is_hugepage_mem_enough(size_t size) | |
242 | { | |
243 | return (size + ~HPAGE_MASK)/HPAGE_SIZE <= free_huge_pages; | |
244 | } | |
245 | ||
246 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ | |
247 | unsigned long hugetlb_total_pages(void) | |
248 | { | |
249 | return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE); | |
250 | } | |
1da177e4 LT |
251 | |
252 | /* | |
253 | * We cannot handle pagefaults against hugetlb pages at all. They cause | |
254 | * handle_mm_fault() to try to instantiate regular-sized pages in the | |
255 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get | |
256 | * this far. | |
257 | */ | |
258 | static struct page *hugetlb_nopage(struct vm_area_struct *vma, | |
259 | unsigned long address, int *unused) | |
260 | { | |
261 | BUG(); | |
262 | return NULL; | |
263 | } | |
264 | ||
265 | struct vm_operations_struct hugetlb_vm_ops = { | |
266 | .nopage = hugetlb_nopage, | |
267 | }; | |
268 | ||
1e8f889b DG |
269 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
270 | int writable) | |
63551ae0 DG |
271 | { |
272 | pte_t entry; | |
273 | ||
1e8f889b | 274 | if (writable) { |
63551ae0 DG |
275 | entry = |
276 | pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot))); | |
277 | } else { | |
278 | entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); | |
279 | } | |
280 | entry = pte_mkyoung(entry); | |
281 | entry = pte_mkhuge(entry); | |
282 | ||
283 | return entry; | |
284 | } | |
285 | ||
1e8f889b DG |
286 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
287 | unsigned long address, pte_t *ptep) | |
288 | { | |
289 | pte_t entry; | |
290 | ||
291 | entry = pte_mkwrite(pte_mkdirty(*ptep)); | |
292 | ptep_set_access_flags(vma, address, ptep, entry, 1); | |
293 | update_mmu_cache(vma, address, entry); | |
294 | lazy_mmu_prot_update(entry); | |
295 | } | |
296 | ||
297 | ||
63551ae0 DG |
298 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
299 | struct vm_area_struct *vma) | |
300 | { | |
301 | pte_t *src_pte, *dst_pte, entry; | |
302 | struct page *ptepage; | |
1c59827d | 303 | unsigned long addr; |
1e8f889b DG |
304 | int cow; |
305 | ||
306 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
63551ae0 | 307 | |
1c59827d | 308 | for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) { |
c74df32c HD |
309 | src_pte = huge_pte_offset(src, addr); |
310 | if (!src_pte) | |
311 | continue; | |
63551ae0 DG |
312 | dst_pte = huge_pte_alloc(dst, addr); |
313 | if (!dst_pte) | |
314 | goto nomem; | |
c74df32c | 315 | spin_lock(&dst->page_table_lock); |
1c59827d | 316 | spin_lock(&src->page_table_lock); |
c74df32c | 317 | if (!pte_none(*src_pte)) { |
1e8f889b DG |
318 | if (cow) |
319 | ptep_set_wrprotect(src, addr, src_pte); | |
1c59827d HD |
320 | entry = *src_pte; |
321 | ptepage = pte_page(entry); | |
322 | get_page(ptepage); | |
4294621f | 323 | add_mm_counter(dst, file_rss, HPAGE_SIZE / PAGE_SIZE); |
1c59827d HD |
324 | set_huge_pte_at(dst, addr, dst_pte, entry); |
325 | } | |
326 | spin_unlock(&src->page_table_lock); | |
c74df32c | 327 | spin_unlock(&dst->page_table_lock); |
63551ae0 DG |
328 | } |
329 | return 0; | |
330 | ||
331 | nomem: | |
332 | return -ENOMEM; | |
333 | } | |
334 | ||
335 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, | |
336 | unsigned long end) | |
337 | { | |
338 | struct mm_struct *mm = vma->vm_mm; | |
339 | unsigned long address; | |
c7546f8f | 340 | pte_t *ptep; |
63551ae0 DG |
341 | pte_t pte; |
342 | struct page *page; | |
343 | ||
344 | WARN_ON(!is_vm_hugetlb_page(vma)); | |
345 | BUG_ON(start & ~HPAGE_MASK); | |
346 | BUG_ON(end & ~HPAGE_MASK); | |
347 | ||
508034a3 HD |
348 | spin_lock(&mm->page_table_lock); |
349 | ||
365e9c87 HD |
350 | /* Update high watermark before we lower rss */ |
351 | update_hiwater_rss(mm); | |
352 | ||
63551ae0 | 353 | for (address = start; address < end; address += HPAGE_SIZE) { |
c7546f8f | 354 | ptep = huge_pte_offset(mm, address); |
4c887265 | 355 | if (!ptep) |
c7546f8f DG |
356 | continue; |
357 | ||
358 | pte = huge_ptep_get_and_clear(mm, address, ptep); | |
63551ae0 DG |
359 | if (pte_none(pte)) |
360 | continue; | |
c7546f8f | 361 | |
63551ae0 DG |
362 | page = pte_page(pte); |
363 | put_page(page); | |
4294621f | 364 | add_mm_counter(mm, file_rss, (int) -(HPAGE_SIZE / PAGE_SIZE)); |
63551ae0 | 365 | } |
63551ae0 | 366 | |
1da177e4 | 367 | spin_unlock(&mm->page_table_lock); |
508034a3 | 368 | flush_tlb_range(vma, start, end); |
1da177e4 | 369 | } |
63551ae0 | 370 | |
1e8f889b DG |
371 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
372 | unsigned long address, pte_t *ptep, pte_t pte) | |
373 | { | |
374 | struct page *old_page, *new_page; | |
375 | int i, avoidcopy; | |
376 | ||
377 | old_page = pte_page(pte); | |
378 | ||
379 | /* If no-one else is actually using this page, avoid the copy | |
380 | * and just make the page writable */ | |
381 | avoidcopy = (page_count(old_page) == 1); | |
382 | if (avoidcopy) { | |
383 | set_huge_ptep_writable(vma, address, ptep); | |
384 | return VM_FAULT_MINOR; | |
385 | } | |
386 | ||
387 | page_cache_get(old_page); | |
5da7ca86 | 388 | new_page = alloc_huge_page(vma, address); |
1e8f889b DG |
389 | |
390 | if (!new_page) { | |
391 | page_cache_release(old_page); | |
392 | ||
393 | /* Logically this is OOM, not a SIGBUS, but an OOM | |
394 | * could cause the kernel to go killing other | |
395 | * processes which won't help the hugepage situation | |
396 | * at all (?) */ | |
397 | return VM_FAULT_SIGBUS; | |
398 | } | |
399 | ||
400 | spin_unlock(&mm->page_table_lock); | |
401 | for (i = 0; i < HPAGE_SIZE/PAGE_SIZE; i++) | |
402 | copy_user_highpage(new_page + i, old_page + i, | |
403 | address + i*PAGE_SIZE); | |
404 | spin_lock(&mm->page_table_lock); | |
405 | ||
406 | ptep = huge_pte_offset(mm, address & HPAGE_MASK); | |
407 | if (likely(pte_same(*ptep, pte))) { | |
408 | /* Break COW */ | |
409 | set_huge_pte_at(mm, address, ptep, | |
410 | make_huge_pte(vma, new_page, 1)); | |
411 | /* Make the old page be freed below */ | |
412 | new_page = old_page; | |
413 | } | |
414 | page_cache_release(new_page); | |
415 | page_cache_release(old_page); | |
416 | return VM_FAULT_MINOR; | |
417 | } | |
418 | ||
86e5216f | 419 | int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
1e8f889b | 420 | unsigned long address, pte_t *ptep, int write_access) |
ac9b9c66 HD |
421 | { |
422 | int ret = VM_FAULT_SIGBUS; | |
4c887265 AL |
423 | unsigned long idx; |
424 | unsigned long size; | |
4c887265 AL |
425 | struct page *page; |
426 | struct address_space *mapping; | |
1e8f889b | 427 | pte_t new_pte; |
4c887265 | 428 | |
4c887265 AL |
429 | mapping = vma->vm_file->f_mapping; |
430 | idx = ((address - vma->vm_start) >> HPAGE_SHIFT) | |
431 | + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT)); | |
432 | ||
433 | /* | |
434 | * Use page lock to guard against racing truncation | |
435 | * before we get page_table_lock. | |
436 | */ | |
6bda666a CL |
437 | retry: |
438 | page = find_lock_page(mapping, idx); | |
439 | if (!page) { | |
440 | if (hugetlb_get_quota(mapping)) | |
441 | goto out; | |
442 | page = alloc_huge_page(vma, address); | |
443 | if (!page) { | |
444 | hugetlb_put_quota(mapping); | |
445 | goto out; | |
446 | } | |
ac9b9c66 | 447 | |
6bda666a CL |
448 | if (vma->vm_flags & VM_SHARED) { |
449 | int err; | |
450 | ||
451 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); | |
452 | if (err) { | |
453 | put_page(page); | |
454 | hugetlb_put_quota(mapping); | |
455 | if (err == -EEXIST) | |
456 | goto retry; | |
457 | goto out; | |
458 | } | |
459 | } else | |
460 | lock_page(page); | |
461 | } | |
1e8f889b | 462 | |
ac9b9c66 | 463 | spin_lock(&mm->page_table_lock); |
4c887265 AL |
464 | size = i_size_read(mapping->host) >> HPAGE_SHIFT; |
465 | if (idx >= size) | |
466 | goto backout; | |
467 | ||
468 | ret = VM_FAULT_MINOR; | |
86e5216f | 469 | if (!pte_none(*ptep)) |
4c887265 AL |
470 | goto backout; |
471 | ||
472 | add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE); | |
1e8f889b DG |
473 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
474 | && (vma->vm_flags & VM_SHARED))); | |
475 | set_huge_pte_at(mm, address, ptep, new_pte); | |
476 | ||
477 | if (write_access && !(vma->vm_flags & VM_SHARED)) { | |
478 | /* Optimization, do the COW without a second fault */ | |
479 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte); | |
480 | } | |
481 | ||
ac9b9c66 | 482 | spin_unlock(&mm->page_table_lock); |
4c887265 AL |
483 | unlock_page(page); |
484 | out: | |
ac9b9c66 | 485 | return ret; |
4c887265 AL |
486 | |
487 | backout: | |
488 | spin_unlock(&mm->page_table_lock); | |
489 | hugetlb_put_quota(mapping); | |
490 | unlock_page(page); | |
491 | put_page(page); | |
492 | goto out; | |
ac9b9c66 HD |
493 | } |
494 | ||
86e5216f AL |
495 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
496 | unsigned long address, int write_access) | |
497 | { | |
498 | pte_t *ptep; | |
499 | pte_t entry; | |
1e8f889b | 500 | int ret; |
86e5216f AL |
501 | |
502 | ptep = huge_pte_alloc(mm, address); | |
503 | if (!ptep) | |
504 | return VM_FAULT_OOM; | |
505 | ||
506 | entry = *ptep; | |
507 | if (pte_none(entry)) | |
1e8f889b | 508 | return hugetlb_no_page(mm, vma, address, ptep, write_access); |
86e5216f | 509 | |
1e8f889b DG |
510 | ret = VM_FAULT_MINOR; |
511 | ||
512 | spin_lock(&mm->page_table_lock); | |
513 | /* Check for a racing update before calling hugetlb_cow */ | |
514 | if (likely(pte_same(entry, *ptep))) | |
515 | if (write_access && !pte_write(entry)) | |
516 | ret = hugetlb_cow(mm, vma, address, ptep, entry); | |
517 | spin_unlock(&mm->page_table_lock); | |
518 | ||
519 | return ret; | |
86e5216f AL |
520 | } |
521 | ||
63551ae0 DG |
522 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
523 | struct page **pages, struct vm_area_struct **vmas, | |
524 | unsigned long *position, int *length, int i) | |
525 | { | |
526 | unsigned long vpfn, vaddr = *position; | |
527 | int remainder = *length; | |
528 | ||
63551ae0 | 529 | vpfn = vaddr/PAGE_SIZE; |
1c59827d | 530 | spin_lock(&mm->page_table_lock); |
63551ae0 | 531 | while (vaddr < vma->vm_end && remainder) { |
4c887265 AL |
532 | pte_t *pte; |
533 | struct page *page; | |
63551ae0 | 534 | |
4c887265 AL |
535 | /* |
536 | * Some archs (sparc64, sh*) have multiple pte_ts to | |
537 | * each hugepage. We have to make * sure we get the | |
538 | * first, for the page indexing below to work. | |
539 | */ | |
540 | pte = huge_pte_offset(mm, vaddr & HPAGE_MASK); | |
63551ae0 | 541 | |
4c887265 AL |
542 | if (!pte || pte_none(*pte)) { |
543 | int ret; | |
63551ae0 | 544 | |
4c887265 AL |
545 | spin_unlock(&mm->page_table_lock); |
546 | ret = hugetlb_fault(mm, vma, vaddr, 0); | |
547 | spin_lock(&mm->page_table_lock); | |
548 | if (ret == VM_FAULT_MINOR) | |
549 | continue; | |
63551ae0 | 550 | |
4c887265 AL |
551 | remainder = 0; |
552 | if (!i) | |
553 | i = -EFAULT; | |
554 | break; | |
555 | } | |
556 | ||
557 | if (pages) { | |
558 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
63551ae0 DG |
559 | get_page(page); |
560 | pages[i] = page; | |
561 | } | |
562 | ||
563 | if (vmas) | |
564 | vmas[i] = vma; | |
565 | ||
566 | vaddr += PAGE_SIZE; | |
567 | ++vpfn; | |
568 | --remainder; | |
569 | ++i; | |
570 | } | |
1c59827d | 571 | spin_unlock(&mm->page_table_lock); |
63551ae0 DG |
572 | *length = remainder; |
573 | *position = vaddr; | |
574 | ||
575 | return i; | |
576 | } |