Commit | Line | Data |
---|---|---|
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 DG |
13 | #include <linux/pagemap.h> |
14 | #include <asm/page.h> | |
15 | #include <asm/pgtable.h> | |
16 | ||
17 | #include <linux/hugetlb.h> | |
1da177e4 LT |
18 | |
19 | const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL; | |
20 | static unsigned long nr_huge_pages, free_huge_pages; | |
21 | unsigned long max_huge_pages; | |
22 | static struct list_head hugepage_freelists[MAX_NUMNODES]; | |
23 | static unsigned int nr_huge_pages_node[MAX_NUMNODES]; | |
24 | static unsigned int free_huge_pages_node[MAX_NUMNODES]; | |
0bd0f9fb EP |
25 | |
26 | /* | |
27 | * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages | |
28 | */ | |
1da177e4 LT |
29 | static DEFINE_SPINLOCK(hugetlb_lock); |
30 | ||
31 | static void enqueue_huge_page(struct page *page) | |
32 | { | |
33 | int nid = page_to_nid(page); | |
34 | list_add(&page->lru, &hugepage_freelists[nid]); | |
35 | free_huge_pages++; | |
36 | free_huge_pages_node[nid]++; | |
37 | } | |
38 | ||
39 | static struct page *dequeue_huge_page(void) | |
40 | { | |
41 | int nid = numa_node_id(); | |
42 | struct page *page = NULL; | |
43 | ||
44 | if (list_empty(&hugepage_freelists[nid])) { | |
45 | for (nid = 0; nid < MAX_NUMNODES; ++nid) | |
46 | if (!list_empty(&hugepage_freelists[nid])) | |
47 | break; | |
48 | } | |
49 | if (nid >= 0 && nid < MAX_NUMNODES && | |
50 | !list_empty(&hugepage_freelists[nid])) { | |
51 | page = list_entry(hugepage_freelists[nid].next, | |
52 | struct page, lru); | |
53 | list_del(&page->lru); | |
54 | free_huge_pages--; | |
55 | free_huge_pages_node[nid]--; | |
56 | } | |
57 | return page; | |
58 | } | |
59 | ||
60 | static struct page *alloc_fresh_huge_page(void) | |
61 | { | |
62 | static int nid = 0; | |
63 | struct page *page; | |
64 | page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN, | |
65 | HUGETLB_PAGE_ORDER); | |
66 | nid = (nid + 1) % num_online_nodes(); | |
67 | if (page) { | |
0bd0f9fb | 68 | spin_lock(&hugetlb_lock); |
1da177e4 LT |
69 | nr_huge_pages++; |
70 | nr_huge_pages_node[page_to_nid(page)]++; | |
0bd0f9fb | 71 | spin_unlock(&hugetlb_lock); |
1da177e4 LT |
72 | } |
73 | return page; | |
74 | } | |
75 | ||
76 | void free_huge_page(struct page *page) | |
77 | { | |
78 | BUG_ON(page_count(page)); | |
79 | ||
80 | INIT_LIST_HEAD(&page->lru); | |
81 | page[1].mapping = NULL; | |
82 | ||
83 | spin_lock(&hugetlb_lock); | |
84 | enqueue_huge_page(page); | |
85 | spin_unlock(&hugetlb_lock); | |
86 | } | |
87 | ||
88 | struct page *alloc_huge_page(void) | |
89 | { | |
90 | struct page *page; | |
91 | int i; | |
92 | ||
93 | spin_lock(&hugetlb_lock); | |
94 | page = dequeue_huge_page(); | |
95 | if (!page) { | |
96 | spin_unlock(&hugetlb_lock); | |
97 | return NULL; | |
98 | } | |
99 | spin_unlock(&hugetlb_lock); | |
100 | set_page_count(page, 1); | |
101 | page[1].mapping = (void *)free_huge_page; | |
102 | for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i) | |
103 | clear_highpage(&page[i]); | |
104 | return page; | |
105 | } | |
106 | ||
107 | static int __init hugetlb_init(void) | |
108 | { | |
109 | unsigned long i; | |
110 | struct page *page; | |
111 | ||
3c726f8d BH |
112 | if (HPAGE_SHIFT == 0) |
113 | return 0; | |
114 | ||
1da177e4 LT |
115 | for (i = 0; i < MAX_NUMNODES; ++i) |
116 | INIT_LIST_HEAD(&hugepage_freelists[i]); | |
117 | ||
118 | for (i = 0; i < max_huge_pages; ++i) { | |
119 | page = alloc_fresh_huge_page(); | |
120 | if (!page) | |
121 | break; | |
122 | spin_lock(&hugetlb_lock); | |
123 | enqueue_huge_page(page); | |
124 | spin_unlock(&hugetlb_lock); | |
125 | } | |
126 | max_huge_pages = free_huge_pages = nr_huge_pages = i; | |
127 | printk("Total HugeTLB memory allocated, %ld\n", free_huge_pages); | |
128 | return 0; | |
129 | } | |
130 | module_init(hugetlb_init); | |
131 | ||
132 | static int __init hugetlb_setup(char *s) | |
133 | { | |
134 | if (sscanf(s, "%lu", &max_huge_pages) <= 0) | |
135 | max_huge_pages = 0; | |
136 | return 1; | |
137 | } | |
138 | __setup("hugepages=", hugetlb_setup); | |
139 | ||
140 | #ifdef CONFIG_SYSCTL | |
141 | static void update_and_free_page(struct page *page) | |
142 | { | |
143 | int i; | |
144 | nr_huge_pages--; | |
145 | nr_huge_pages_node[page_zone(page)->zone_pgdat->node_id]--; | |
146 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) { | |
147 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | | |
148 | 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved | | |
149 | 1 << PG_private | 1<< PG_writeback); | |
150 | set_page_count(&page[i], 0); | |
151 | } | |
152 | set_page_count(page, 1); | |
153 | __free_pages(page, HUGETLB_PAGE_ORDER); | |
154 | } | |
155 | ||
156 | #ifdef CONFIG_HIGHMEM | |
157 | static void try_to_free_low(unsigned long count) | |
158 | { | |
159 | int i, nid; | |
160 | for (i = 0; i < MAX_NUMNODES; ++i) { | |
161 | struct page *page, *next; | |
162 | list_for_each_entry_safe(page, next, &hugepage_freelists[i], lru) { | |
163 | if (PageHighMem(page)) | |
164 | continue; | |
165 | list_del(&page->lru); | |
166 | update_and_free_page(page); | |
167 | nid = page_zone(page)->zone_pgdat->node_id; | |
168 | free_huge_pages--; | |
169 | free_huge_pages_node[nid]--; | |
170 | if (count >= nr_huge_pages) | |
171 | return; | |
172 | } | |
173 | } | |
174 | } | |
175 | #else | |
176 | static inline void try_to_free_low(unsigned long count) | |
177 | { | |
178 | } | |
179 | #endif | |
180 | ||
181 | static unsigned long set_max_huge_pages(unsigned long count) | |
182 | { | |
183 | while (count > nr_huge_pages) { | |
184 | struct page *page = alloc_fresh_huge_page(); | |
185 | if (!page) | |
186 | return nr_huge_pages; | |
187 | spin_lock(&hugetlb_lock); | |
188 | enqueue_huge_page(page); | |
189 | spin_unlock(&hugetlb_lock); | |
190 | } | |
191 | if (count >= nr_huge_pages) | |
192 | return nr_huge_pages; | |
193 | ||
194 | spin_lock(&hugetlb_lock); | |
195 | try_to_free_low(count); | |
196 | while (count < nr_huge_pages) { | |
197 | struct page *page = dequeue_huge_page(); | |
198 | if (!page) | |
199 | break; | |
200 | update_and_free_page(page); | |
201 | } | |
202 | spin_unlock(&hugetlb_lock); | |
203 | return nr_huge_pages; | |
204 | } | |
205 | ||
206 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, | |
207 | struct file *file, void __user *buffer, | |
208 | size_t *length, loff_t *ppos) | |
209 | { | |
210 | proc_doulongvec_minmax(table, write, file, buffer, length, ppos); | |
211 | max_huge_pages = set_max_huge_pages(max_huge_pages); | |
212 | return 0; | |
213 | } | |
214 | #endif /* CONFIG_SYSCTL */ | |
215 | ||
216 | int hugetlb_report_meminfo(char *buf) | |
217 | { | |
218 | return sprintf(buf, | |
219 | "HugePages_Total: %5lu\n" | |
220 | "HugePages_Free: %5lu\n" | |
221 | "Hugepagesize: %5lu kB\n", | |
222 | nr_huge_pages, | |
223 | free_huge_pages, | |
224 | HPAGE_SIZE/1024); | |
225 | } | |
226 | ||
227 | int hugetlb_report_node_meminfo(int nid, char *buf) | |
228 | { | |
229 | return sprintf(buf, | |
230 | "Node %d HugePages_Total: %5u\n" | |
231 | "Node %d HugePages_Free: %5u\n", | |
232 | nid, nr_huge_pages_node[nid], | |
233 | nid, free_huge_pages_node[nid]); | |
234 | } | |
235 | ||
236 | int is_hugepage_mem_enough(size_t size) | |
237 | { | |
238 | return (size + ~HPAGE_MASK)/HPAGE_SIZE <= free_huge_pages; | |
239 | } | |
240 | ||
241 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ | |
242 | unsigned long hugetlb_total_pages(void) | |
243 | { | |
244 | return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE); | |
245 | } | |
1da177e4 LT |
246 | |
247 | /* | |
248 | * We cannot handle pagefaults against hugetlb pages at all. They cause | |
249 | * handle_mm_fault() to try to instantiate regular-sized pages in the | |
250 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get | |
251 | * this far. | |
252 | */ | |
253 | static struct page *hugetlb_nopage(struct vm_area_struct *vma, | |
254 | unsigned long address, int *unused) | |
255 | { | |
256 | BUG(); | |
257 | return NULL; | |
258 | } | |
259 | ||
260 | struct vm_operations_struct hugetlb_vm_ops = { | |
261 | .nopage = hugetlb_nopage, | |
262 | }; | |
263 | ||
1e8f889b DG |
264 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
265 | int writable) | |
63551ae0 DG |
266 | { |
267 | pte_t entry; | |
268 | ||
1e8f889b | 269 | if (writable) { |
63551ae0 DG |
270 | entry = |
271 | pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot))); | |
272 | } else { | |
273 | entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); | |
274 | } | |
275 | entry = pte_mkyoung(entry); | |
276 | entry = pte_mkhuge(entry); | |
277 | ||
278 | return entry; | |
279 | } | |
280 | ||
1e8f889b DG |
281 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
282 | unsigned long address, pte_t *ptep) | |
283 | { | |
284 | pte_t entry; | |
285 | ||
286 | entry = pte_mkwrite(pte_mkdirty(*ptep)); | |
287 | ptep_set_access_flags(vma, address, ptep, entry, 1); | |
288 | update_mmu_cache(vma, address, entry); | |
289 | lazy_mmu_prot_update(entry); | |
290 | } | |
291 | ||
292 | ||
63551ae0 DG |
293 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
294 | struct vm_area_struct *vma) | |
295 | { | |
296 | pte_t *src_pte, *dst_pte, entry; | |
297 | struct page *ptepage; | |
1c59827d | 298 | unsigned long addr; |
1e8f889b DG |
299 | int cow; |
300 | ||
301 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
63551ae0 | 302 | |
1c59827d | 303 | for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) { |
c74df32c HD |
304 | src_pte = huge_pte_offset(src, addr); |
305 | if (!src_pte) | |
306 | continue; | |
63551ae0 DG |
307 | dst_pte = huge_pte_alloc(dst, addr); |
308 | if (!dst_pte) | |
309 | goto nomem; | |
c74df32c | 310 | spin_lock(&dst->page_table_lock); |
1c59827d | 311 | spin_lock(&src->page_table_lock); |
c74df32c | 312 | if (!pte_none(*src_pte)) { |
1e8f889b DG |
313 | if (cow) |
314 | ptep_set_wrprotect(src, addr, src_pte); | |
1c59827d HD |
315 | entry = *src_pte; |
316 | ptepage = pte_page(entry); | |
317 | get_page(ptepage); | |
4294621f | 318 | add_mm_counter(dst, file_rss, HPAGE_SIZE / PAGE_SIZE); |
1c59827d HD |
319 | set_huge_pte_at(dst, addr, dst_pte, entry); |
320 | } | |
321 | spin_unlock(&src->page_table_lock); | |
c74df32c | 322 | spin_unlock(&dst->page_table_lock); |
63551ae0 DG |
323 | } |
324 | return 0; | |
325 | ||
326 | nomem: | |
327 | return -ENOMEM; | |
328 | } | |
329 | ||
330 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, | |
331 | unsigned long end) | |
332 | { | |
333 | struct mm_struct *mm = vma->vm_mm; | |
334 | unsigned long address; | |
c7546f8f | 335 | pte_t *ptep; |
63551ae0 DG |
336 | pte_t pte; |
337 | struct page *page; | |
338 | ||
339 | WARN_ON(!is_vm_hugetlb_page(vma)); | |
340 | BUG_ON(start & ~HPAGE_MASK); | |
341 | BUG_ON(end & ~HPAGE_MASK); | |
342 | ||
508034a3 HD |
343 | spin_lock(&mm->page_table_lock); |
344 | ||
365e9c87 HD |
345 | /* Update high watermark before we lower rss */ |
346 | update_hiwater_rss(mm); | |
347 | ||
63551ae0 | 348 | for (address = start; address < end; address += HPAGE_SIZE) { |
c7546f8f | 349 | ptep = huge_pte_offset(mm, address); |
4c887265 | 350 | if (!ptep) |
c7546f8f DG |
351 | continue; |
352 | ||
353 | pte = huge_ptep_get_and_clear(mm, address, ptep); | |
63551ae0 DG |
354 | if (pte_none(pte)) |
355 | continue; | |
c7546f8f | 356 | |
63551ae0 DG |
357 | page = pte_page(pte); |
358 | put_page(page); | |
4294621f | 359 | add_mm_counter(mm, file_rss, (int) -(HPAGE_SIZE / PAGE_SIZE)); |
63551ae0 | 360 | } |
63551ae0 | 361 | |
1da177e4 | 362 | spin_unlock(&mm->page_table_lock); |
508034a3 | 363 | flush_tlb_range(vma, start, end); |
1da177e4 | 364 | } |
63551ae0 | 365 | |
85ef47f7 | 366 | static struct page *find_or_alloc_huge_page(struct address_space *mapping, |
1e8f889b | 367 | unsigned long idx, int shared) |
63551ae0 | 368 | { |
4c887265 AL |
369 | struct page *page; |
370 | int err; | |
4c887265 AL |
371 | |
372 | retry: | |
373 | page = find_lock_page(mapping, idx); | |
374 | if (page) | |
375 | goto out; | |
376 | ||
4c887265 AL |
377 | if (hugetlb_get_quota(mapping)) |
378 | goto out; | |
379 | page = alloc_huge_page(); | |
380 | if (!page) { | |
381 | hugetlb_put_quota(mapping); | |
382 | goto out; | |
383 | } | |
63551ae0 | 384 | |
1e8f889b DG |
385 | if (shared) { |
386 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); | |
387 | if (err) { | |
388 | put_page(page); | |
389 | hugetlb_put_quota(mapping); | |
390 | if (err == -EEXIST) | |
391 | goto retry; | |
392 | page = NULL; | |
393 | } | |
394 | } else { | |
395 | /* Caller expects a locked page */ | |
396 | lock_page(page); | |
63551ae0 DG |
397 | } |
398 | out: | |
4c887265 | 399 | return page; |
63551ae0 DG |
400 | } |
401 | ||
1e8f889b DG |
402 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
403 | unsigned long address, pte_t *ptep, pte_t pte) | |
404 | { | |
405 | struct page *old_page, *new_page; | |
406 | int i, avoidcopy; | |
407 | ||
408 | old_page = pte_page(pte); | |
409 | ||
410 | /* If no-one else is actually using this page, avoid the copy | |
411 | * and just make the page writable */ | |
412 | avoidcopy = (page_count(old_page) == 1); | |
413 | if (avoidcopy) { | |
414 | set_huge_ptep_writable(vma, address, ptep); | |
415 | return VM_FAULT_MINOR; | |
416 | } | |
417 | ||
418 | page_cache_get(old_page); | |
419 | new_page = alloc_huge_page(); | |
420 | ||
421 | if (!new_page) { | |
422 | page_cache_release(old_page); | |
423 | ||
424 | /* Logically this is OOM, not a SIGBUS, but an OOM | |
425 | * could cause the kernel to go killing other | |
426 | * processes which won't help the hugepage situation | |
427 | * at all (?) */ | |
428 | return VM_FAULT_SIGBUS; | |
429 | } | |
430 | ||
431 | spin_unlock(&mm->page_table_lock); | |
432 | for (i = 0; i < HPAGE_SIZE/PAGE_SIZE; i++) | |
433 | copy_user_highpage(new_page + i, old_page + i, | |
434 | address + i*PAGE_SIZE); | |
435 | spin_lock(&mm->page_table_lock); | |
436 | ||
437 | ptep = huge_pte_offset(mm, address & HPAGE_MASK); | |
438 | if (likely(pte_same(*ptep, pte))) { | |
439 | /* Break COW */ | |
440 | set_huge_pte_at(mm, address, ptep, | |
441 | make_huge_pte(vma, new_page, 1)); | |
442 | /* Make the old page be freed below */ | |
443 | new_page = old_page; | |
444 | } | |
445 | page_cache_release(new_page); | |
446 | page_cache_release(old_page); | |
447 | return VM_FAULT_MINOR; | |
448 | } | |
449 | ||
86e5216f | 450 | int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
1e8f889b | 451 | unsigned long address, pte_t *ptep, int write_access) |
ac9b9c66 HD |
452 | { |
453 | int ret = VM_FAULT_SIGBUS; | |
4c887265 AL |
454 | unsigned long idx; |
455 | unsigned long size; | |
4c887265 AL |
456 | struct page *page; |
457 | struct address_space *mapping; | |
1e8f889b | 458 | pte_t new_pte; |
4c887265 | 459 | |
4c887265 AL |
460 | mapping = vma->vm_file->f_mapping; |
461 | idx = ((address - vma->vm_start) >> HPAGE_SHIFT) | |
462 | + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT)); | |
463 | ||
464 | /* | |
465 | * Use page lock to guard against racing truncation | |
466 | * before we get page_table_lock. | |
467 | */ | |
1e8f889b DG |
468 | page = find_or_alloc_huge_page(mapping, idx, |
469 | vma->vm_flags & VM_SHARED); | |
4c887265 AL |
470 | if (!page) |
471 | goto out; | |
ac9b9c66 | 472 | |
1e8f889b DG |
473 | BUG_ON(!PageLocked(page)); |
474 | ||
ac9b9c66 | 475 | spin_lock(&mm->page_table_lock); |
4c887265 AL |
476 | size = i_size_read(mapping->host) >> HPAGE_SHIFT; |
477 | if (idx >= size) | |
478 | goto backout; | |
479 | ||
480 | ret = VM_FAULT_MINOR; | |
86e5216f | 481 | if (!pte_none(*ptep)) |
4c887265 AL |
482 | goto backout; |
483 | ||
484 | add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE); | |
1e8f889b DG |
485 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
486 | && (vma->vm_flags & VM_SHARED))); | |
487 | set_huge_pte_at(mm, address, ptep, new_pte); | |
488 | ||
489 | if (write_access && !(vma->vm_flags & VM_SHARED)) { | |
490 | /* Optimization, do the COW without a second fault */ | |
491 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte); | |
492 | } | |
493 | ||
ac9b9c66 | 494 | spin_unlock(&mm->page_table_lock); |
4c887265 AL |
495 | unlock_page(page); |
496 | out: | |
ac9b9c66 | 497 | return ret; |
4c887265 AL |
498 | |
499 | backout: | |
500 | spin_unlock(&mm->page_table_lock); | |
501 | hugetlb_put_quota(mapping); | |
502 | unlock_page(page); | |
503 | put_page(page); | |
504 | goto out; | |
ac9b9c66 HD |
505 | } |
506 | ||
86e5216f AL |
507 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
508 | unsigned long address, int write_access) | |
509 | { | |
510 | pte_t *ptep; | |
511 | pte_t entry; | |
1e8f889b | 512 | int ret; |
86e5216f AL |
513 | |
514 | ptep = huge_pte_alloc(mm, address); | |
515 | if (!ptep) | |
516 | return VM_FAULT_OOM; | |
517 | ||
518 | entry = *ptep; | |
519 | if (pte_none(entry)) | |
1e8f889b | 520 | return hugetlb_no_page(mm, vma, address, ptep, write_access); |
86e5216f | 521 | |
1e8f889b DG |
522 | ret = VM_FAULT_MINOR; |
523 | ||
524 | spin_lock(&mm->page_table_lock); | |
525 | /* Check for a racing update before calling hugetlb_cow */ | |
526 | if (likely(pte_same(entry, *ptep))) | |
527 | if (write_access && !pte_write(entry)) | |
528 | ret = hugetlb_cow(mm, vma, address, ptep, entry); | |
529 | spin_unlock(&mm->page_table_lock); | |
530 | ||
531 | return ret; | |
86e5216f AL |
532 | } |
533 | ||
63551ae0 DG |
534 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
535 | struct page **pages, struct vm_area_struct **vmas, | |
536 | unsigned long *position, int *length, int i) | |
537 | { | |
538 | unsigned long vpfn, vaddr = *position; | |
539 | int remainder = *length; | |
540 | ||
63551ae0 | 541 | vpfn = vaddr/PAGE_SIZE; |
1c59827d | 542 | spin_lock(&mm->page_table_lock); |
63551ae0 | 543 | while (vaddr < vma->vm_end && remainder) { |
4c887265 AL |
544 | pte_t *pte; |
545 | struct page *page; | |
63551ae0 | 546 | |
4c887265 AL |
547 | /* |
548 | * Some archs (sparc64, sh*) have multiple pte_ts to | |
549 | * each hugepage. We have to make * sure we get the | |
550 | * first, for the page indexing below to work. | |
551 | */ | |
552 | pte = huge_pte_offset(mm, vaddr & HPAGE_MASK); | |
63551ae0 | 553 | |
4c887265 AL |
554 | if (!pte || pte_none(*pte)) { |
555 | int ret; | |
63551ae0 | 556 | |
4c887265 AL |
557 | spin_unlock(&mm->page_table_lock); |
558 | ret = hugetlb_fault(mm, vma, vaddr, 0); | |
559 | spin_lock(&mm->page_table_lock); | |
560 | if (ret == VM_FAULT_MINOR) | |
561 | continue; | |
63551ae0 | 562 | |
4c887265 AL |
563 | remainder = 0; |
564 | if (!i) | |
565 | i = -EFAULT; | |
566 | break; | |
567 | } | |
568 | ||
569 | if (pages) { | |
570 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
63551ae0 DG |
571 | get_page(page); |
572 | pages[i] = page; | |
573 | } | |
574 | ||
575 | if (vmas) | |
576 | vmas[i] = vma; | |
577 | ||
578 | vaddr += PAGE_SIZE; | |
579 | ++vpfn; | |
580 | --remainder; | |
581 | ++i; | |
582 | } | |
1c59827d | 583 | spin_unlock(&mm->page_table_lock); |
63551ae0 DG |
584 | *length = remainder; |
585 | *position = vaddr; | |
586 | ||
587 | return i; | |
588 | } |