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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 | 14 | #include <linux/mempolicy.h> |
aea47ff3 | 15 | #include <linux/cpuset.h> |
5da7ca86 | 16 | |
63551ae0 DG |
17 | #include <asm/page.h> |
18 | #include <asm/pgtable.h> | |
19 | ||
20 | #include <linux/hugetlb.h> | |
1da177e4 LT |
21 | |
22 | const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL; | |
23 | static unsigned long nr_huge_pages, free_huge_pages; | |
24 | unsigned long max_huge_pages; | |
25 | static struct list_head hugepage_freelists[MAX_NUMNODES]; | |
26 | static unsigned int nr_huge_pages_node[MAX_NUMNODES]; | |
27 | static unsigned int free_huge_pages_node[MAX_NUMNODES]; | |
0bd0f9fb EP |
28 | |
29 | /* | |
30 | * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages | |
31 | */ | |
1da177e4 LT |
32 | static DEFINE_SPINLOCK(hugetlb_lock); |
33 | ||
34 | static void enqueue_huge_page(struct page *page) | |
35 | { | |
36 | int nid = page_to_nid(page); | |
37 | list_add(&page->lru, &hugepage_freelists[nid]); | |
38 | free_huge_pages++; | |
39 | free_huge_pages_node[nid]++; | |
40 | } | |
41 | ||
5da7ca86 CL |
42 | static struct page *dequeue_huge_page(struct vm_area_struct *vma, |
43 | unsigned long address) | |
1da177e4 LT |
44 | { |
45 | int nid = numa_node_id(); | |
46 | struct page *page = NULL; | |
5da7ca86 | 47 | struct zonelist *zonelist = huge_zonelist(vma, address); |
96df9333 | 48 | struct zone **z; |
1da177e4 | 49 | |
96df9333 CL |
50 | for (z = zonelist->zones; *z; z++) { |
51 | nid = (*z)->zone_pgdat->node_id; | |
aea47ff3 CL |
52 | if (cpuset_zone_allowed(*z, GFP_HIGHUSER) && |
53 | !list_empty(&hugepage_freelists[nid])) | |
96df9333 | 54 | break; |
1da177e4 | 55 | } |
96df9333 CL |
56 | |
57 | if (*z) { | |
1da177e4 LT |
58 | page = list_entry(hugepage_freelists[nid].next, |
59 | struct page, lru); | |
60 | list_del(&page->lru); | |
61 | free_huge_pages--; | |
62 | free_huge_pages_node[nid]--; | |
63 | } | |
64 | return page; | |
65 | } | |
66 | ||
67 | static struct page *alloc_fresh_huge_page(void) | |
68 | { | |
69 | static int nid = 0; | |
70 | struct page *page; | |
71 | page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN, | |
72 | HUGETLB_PAGE_ORDER); | |
73 | nid = (nid + 1) % num_online_nodes(); | |
74 | if (page) { | |
0bd0f9fb | 75 | spin_lock(&hugetlb_lock); |
1da177e4 LT |
76 | nr_huge_pages++; |
77 | nr_huge_pages_node[page_to_nid(page)]++; | |
0bd0f9fb | 78 | spin_unlock(&hugetlb_lock); |
1da177e4 LT |
79 | } |
80 | return page; | |
81 | } | |
82 | ||
83 | void free_huge_page(struct page *page) | |
84 | { | |
85 | BUG_ON(page_count(page)); | |
86 | ||
87 | INIT_LIST_HEAD(&page->lru); | |
88 | page[1].mapping = NULL; | |
89 | ||
90 | spin_lock(&hugetlb_lock); | |
91 | enqueue_huge_page(page); | |
92 | spin_unlock(&hugetlb_lock); | |
93 | } | |
94 | ||
5da7ca86 | 95 | struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr) |
1da177e4 LT |
96 | { |
97 | struct page *page; | |
98 | int i; | |
99 | ||
100 | spin_lock(&hugetlb_lock); | |
5da7ca86 | 101 | page = dequeue_huge_page(vma, addr); |
1da177e4 LT |
102 | if (!page) { |
103 | spin_unlock(&hugetlb_lock); | |
104 | return NULL; | |
105 | } | |
106 | spin_unlock(&hugetlb_lock); | |
107 | set_page_count(page, 1); | |
108 | page[1].mapping = (void *)free_huge_page; | |
109 | for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i) | |
a2dfef69 | 110 | clear_user_highpage(&page[i], addr); |
1da177e4 LT |
111 | return page; |
112 | } | |
113 | ||
114 | static int __init hugetlb_init(void) | |
115 | { | |
116 | unsigned long i; | |
117 | struct page *page; | |
118 | ||
3c726f8d BH |
119 | if (HPAGE_SHIFT == 0) |
120 | return 0; | |
121 | ||
1da177e4 LT |
122 | for (i = 0; i < MAX_NUMNODES; ++i) |
123 | INIT_LIST_HEAD(&hugepage_freelists[i]); | |
124 | ||
125 | for (i = 0; i < max_huge_pages; ++i) { | |
126 | page = alloc_fresh_huge_page(); | |
127 | if (!page) | |
128 | break; | |
129 | spin_lock(&hugetlb_lock); | |
130 | enqueue_huge_page(page); | |
131 | spin_unlock(&hugetlb_lock); | |
132 | } | |
133 | max_huge_pages = free_huge_pages = nr_huge_pages = i; | |
134 | printk("Total HugeTLB memory allocated, %ld\n", free_huge_pages); | |
135 | return 0; | |
136 | } | |
137 | module_init(hugetlb_init); | |
138 | ||
139 | static int __init hugetlb_setup(char *s) | |
140 | { | |
141 | if (sscanf(s, "%lu", &max_huge_pages) <= 0) | |
142 | max_huge_pages = 0; | |
143 | return 1; | |
144 | } | |
145 | __setup("hugepages=", hugetlb_setup); | |
146 | ||
147 | #ifdef CONFIG_SYSCTL | |
148 | static void update_and_free_page(struct page *page) | |
149 | { | |
150 | int i; | |
151 | nr_huge_pages--; | |
152 | nr_huge_pages_node[page_zone(page)->zone_pgdat->node_id]--; | |
153 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) { | |
154 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | | |
155 | 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved | | |
156 | 1 << PG_private | 1<< PG_writeback); | |
157 | set_page_count(&page[i], 0); | |
158 | } | |
159 | set_page_count(page, 1); | |
160 | __free_pages(page, HUGETLB_PAGE_ORDER); | |
161 | } | |
162 | ||
163 | #ifdef CONFIG_HIGHMEM | |
164 | static void try_to_free_low(unsigned long count) | |
165 | { | |
166 | int i, nid; | |
167 | for (i = 0; i < MAX_NUMNODES; ++i) { | |
168 | struct page *page, *next; | |
169 | list_for_each_entry_safe(page, next, &hugepage_freelists[i], lru) { | |
170 | if (PageHighMem(page)) | |
171 | continue; | |
172 | list_del(&page->lru); | |
173 | update_and_free_page(page); | |
174 | nid = page_zone(page)->zone_pgdat->node_id; | |
175 | free_huge_pages--; | |
176 | free_huge_pages_node[nid]--; | |
177 | if (count >= nr_huge_pages) | |
178 | return; | |
179 | } | |
180 | } | |
181 | } | |
182 | #else | |
183 | static inline void try_to_free_low(unsigned long count) | |
184 | { | |
185 | } | |
186 | #endif | |
187 | ||
188 | static unsigned long set_max_huge_pages(unsigned long count) | |
189 | { | |
190 | while (count > nr_huge_pages) { | |
191 | struct page *page = alloc_fresh_huge_page(); | |
192 | if (!page) | |
193 | return nr_huge_pages; | |
194 | spin_lock(&hugetlb_lock); | |
195 | enqueue_huge_page(page); | |
196 | spin_unlock(&hugetlb_lock); | |
197 | } | |
198 | if (count >= nr_huge_pages) | |
199 | return nr_huge_pages; | |
200 | ||
201 | spin_lock(&hugetlb_lock); | |
202 | try_to_free_low(count); | |
203 | while (count < nr_huge_pages) { | |
5da7ca86 | 204 | struct page *page = dequeue_huge_page(NULL, 0); |
1da177e4 LT |
205 | if (!page) |
206 | break; | |
207 | update_and_free_page(page); | |
208 | } | |
209 | spin_unlock(&hugetlb_lock); | |
210 | return nr_huge_pages; | |
211 | } | |
212 | ||
213 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, | |
214 | struct file *file, void __user *buffer, | |
215 | size_t *length, loff_t *ppos) | |
216 | { | |
217 | proc_doulongvec_minmax(table, write, file, buffer, length, ppos); | |
218 | max_huge_pages = set_max_huge_pages(max_huge_pages); | |
219 | return 0; | |
220 | } | |
221 | #endif /* CONFIG_SYSCTL */ | |
222 | ||
223 | int hugetlb_report_meminfo(char *buf) | |
224 | { | |
225 | return sprintf(buf, | |
226 | "HugePages_Total: %5lu\n" | |
227 | "HugePages_Free: %5lu\n" | |
228 | "Hugepagesize: %5lu kB\n", | |
229 | nr_huge_pages, | |
230 | free_huge_pages, | |
231 | HPAGE_SIZE/1024); | |
232 | } | |
233 | ||
234 | int hugetlb_report_node_meminfo(int nid, char *buf) | |
235 | { | |
236 | return sprintf(buf, | |
237 | "Node %d HugePages_Total: %5u\n" | |
238 | "Node %d HugePages_Free: %5u\n", | |
239 | nid, nr_huge_pages_node[nid], | |
240 | nid, free_huge_pages_node[nid]); | |
241 | } | |
242 | ||
243 | int is_hugepage_mem_enough(size_t size) | |
244 | { | |
245 | return (size + ~HPAGE_MASK)/HPAGE_SIZE <= free_huge_pages; | |
246 | } | |
247 | ||
248 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ | |
249 | unsigned long hugetlb_total_pages(void) | |
250 | { | |
251 | return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE); | |
252 | } | |
1da177e4 LT |
253 | |
254 | /* | |
255 | * We cannot handle pagefaults against hugetlb pages at all. They cause | |
256 | * handle_mm_fault() to try to instantiate regular-sized pages in the | |
257 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get | |
258 | * this far. | |
259 | */ | |
260 | static struct page *hugetlb_nopage(struct vm_area_struct *vma, | |
261 | unsigned long address, int *unused) | |
262 | { | |
263 | BUG(); | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | struct vm_operations_struct hugetlb_vm_ops = { | |
268 | .nopage = hugetlb_nopage, | |
269 | }; | |
270 | ||
1e8f889b DG |
271 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
272 | int writable) | |
63551ae0 DG |
273 | { |
274 | pte_t entry; | |
275 | ||
1e8f889b | 276 | if (writable) { |
63551ae0 DG |
277 | entry = |
278 | pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot))); | |
279 | } else { | |
280 | entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); | |
281 | } | |
282 | entry = pte_mkyoung(entry); | |
283 | entry = pte_mkhuge(entry); | |
284 | ||
285 | return entry; | |
286 | } | |
287 | ||
1e8f889b DG |
288 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
289 | unsigned long address, pte_t *ptep) | |
290 | { | |
291 | pte_t entry; | |
292 | ||
293 | entry = pte_mkwrite(pte_mkdirty(*ptep)); | |
294 | ptep_set_access_flags(vma, address, ptep, entry, 1); | |
295 | update_mmu_cache(vma, address, entry); | |
296 | lazy_mmu_prot_update(entry); | |
297 | } | |
298 | ||
299 | ||
63551ae0 DG |
300 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
301 | struct vm_area_struct *vma) | |
302 | { | |
303 | pte_t *src_pte, *dst_pte, entry; | |
304 | struct page *ptepage; | |
1c59827d | 305 | unsigned long addr; |
1e8f889b DG |
306 | int cow; |
307 | ||
308 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
63551ae0 | 309 | |
1c59827d | 310 | for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) { |
c74df32c HD |
311 | src_pte = huge_pte_offset(src, addr); |
312 | if (!src_pte) | |
313 | continue; | |
63551ae0 DG |
314 | dst_pte = huge_pte_alloc(dst, addr); |
315 | if (!dst_pte) | |
316 | goto nomem; | |
c74df32c | 317 | spin_lock(&dst->page_table_lock); |
1c59827d | 318 | spin_lock(&src->page_table_lock); |
c74df32c | 319 | if (!pte_none(*src_pte)) { |
1e8f889b DG |
320 | if (cow) |
321 | ptep_set_wrprotect(src, addr, src_pte); | |
1c59827d HD |
322 | entry = *src_pte; |
323 | ptepage = pte_page(entry); | |
324 | get_page(ptepage); | |
4294621f | 325 | add_mm_counter(dst, file_rss, HPAGE_SIZE / PAGE_SIZE); |
1c59827d HD |
326 | set_huge_pte_at(dst, addr, dst_pte, entry); |
327 | } | |
328 | spin_unlock(&src->page_table_lock); | |
c74df32c | 329 | spin_unlock(&dst->page_table_lock); |
63551ae0 DG |
330 | } |
331 | return 0; | |
332 | ||
333 | nomem: | |
334 | return -ENOMEM; | |
335 | } | |
336 | ||
337 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, | |
338 | unsigned long end) | |
339 | { | |
340 | struct mm_struct *mm = vma->vm_mm; | |
341 | unsigned long address; | |
c7546f8f | 342 | pte_t *ptep; |
63551ae0 DG |
343 | pte_t pte; |
344 | struct page *page; | |
345 | ||
346 | WARN_ON(!is_vm_hugetlb_page(vma)); | |
347 | BUG_ON(start & ~HPAGE_MASK); | |
348 | BUG_ON(end & ~HPAGE_MASK); | |
349 | ||
508034a3 HD |
350 | spin_lock(&mm->page_table_lock); |
351 | ||
365e9c87 HD |
352 | /* Update high watermark before we lower rss */ |
353 | update_hiwater_rss(mm); | |
354 | ||
63551ae0 | 355 | for (address = start; address < end; address += HPAGE_SIZE) { |
c7546f8f | 356 | ptep = huge_pte_offset(mm, address); |
4c887265 | 357 | if (!ptep) |
c7546f8f DG |
358 | continue; |
359 | ||
360 | pte = huge_ptep_get_and_clear(mm, address, ptep); | |
63551ae0 DG |
361 | if (pte_none(pte)) |
362 | continue; | |
c7546f8f | 363 | |
63551ae0 DG |
364 | page = pte_page(pte); |
365 | put_page(page); | |
4294621f | 366 | add_mm_counter(mm, file_rss, (int) -(HPAGE_SIZE / PAGE_SIZE)); |
63551ae0 | 367 | } |
63551ae0 | 368 | |
1da177e4 | 369 | spin_unlock(&mm->page_table_lock); |
508034a3 | 370 | flush_tlb_range(vma, start, end); |
1da177e4 | 371 | } |
63551ae0 | 372 | |
1e8f889b DG |
373 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
374 | unsigned long address, pte_t *ptep, pte_t pte) | |
375 | { | |
376 | struct page *old_page, *new_page; | |
377 | int i, avoidcopy; | |
378 | ||
379 | old_page = pte_page(pte); | |
380 | ||
381 | /* If no-one else is actually using this page, avoid the copy | |
382 | * and just make the page writable */ | |
383 | avoidcopy = (page_count(old_page) == 1); | |
384 | if (avoidcopy) { | |
385 | set_huge_ptep_writable(vma, address, ptep); | |
386 | return VM_FAULT_MINOR; | |
387 | } | |
388 | ||
389 | page_cache_get(old_page); | |
5da7ca86 | 390 | new_page = alloc_huge_page(vma, address); |
1e8f889b DG |
391 | |
392 | if (!new_page) { | |
393 | page_cache_release(old_page); | |
394 | ||
395 | /* Logically this is OOM, not a SIGBUS, but an OOM | |
396 | * could cause the kernel to go killing other | |
397 | * processes which won't help the hugepage situation | |
398 | * at all (?) */ | |
399 | return VM_FAULT_SIGBUS; | |
400 | } | |
401 | ||
402 | spin_unlock(&mm->page_table_lock); | |
403 | for (i = 0; i < HPAGE_SIZE/PAGE_SIZE; i++) | |
404 | copy_user_highpage(new_page + i, old_page + i, | |
405 | address + i*PAGE_SIZE); | |
406 | spin_lock(&mm->page_table_lock); | |
407 | ||
408 | ptep = huge_pte_offset(mm, address & HPAGE_MASK); | |
409 | if (likely(pte_same(*ptep, pte))) { | |
410 | /* Break COW */ | |
411 | set_huge_pte_at(mm, address, ptep, | |
412 | make_huge_pte(vma, new_page, 1)); | |
413 | /* Make the old page be freed below */ | |
414 | new_page = old_page; | |
415 | } | |
416 | page_cache_release(new_page); | |
417 | page_cache_release(old_page); | |
418 | return VM_FAULT_MINOR; | |
419 | } | |
420 | ||
86e5216f | 421 | int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
1e8f889b | 422 | unsigned long address, pte_t *ptep, int write_access) |
ac9b9c66 HD |
423 | { |
424 | int ret = VM_FAULT_SIGBUS; | |
4c887265 AL |
425 | unsigned long idx; |
426 | unsigned long size; | |
4c887265 AL |
427 | struct page *page; |
428 | struct address_space *mapping; | |
1e8f889b | 429 | pte_t new_pte; |
4c887265 | 430 | |
4c887265 AL |
431 | mapping = vma->vm_file->f_mapping; |
432 | idx = ((address - vma->vm_start) >> HPAGE_SHIFT) | |
433 | + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT)); | |
434 | ||
435 | /* | |
436 | * Use page lock to guard against racing truncation | |
437 | * before we get page_table_lock. | |
438 | */ | |
6bda666a CL |
439 | retry: |
440 | page = find_lock_page(mapping, idx); | |
441 | if (!page) { | |
442 | if (hugetlb_get_quota(mapping)) | |
443 | goto out; | |
444 | page = alloc_huge_page(vma, address); | |
445 | if (!page) { | |
446 | hugetlb_put_quota(mapping); | |
64b4a954 CL |
447 | /* |
448 | * No huge pages available. So this is an OOM | |
449 | * condition but we do not want to trigger the OOM | |
450 | * killer, so we return VM_FAULT_SIGBUS. | |
451 | * | |
452 | * A program using hugepages may fault with Bus Error | |
453 | * because no huge pages are available in the cpuset, per | |
454 | * memory policy or because all are in use! | |
455 | */ | |
6bda666a CL |
456 | goto out; |
457 | } | |
ac9b9c66 | 458 | |
6bda666a CL |
459 | if (vma->vm_flags & VM_SHARED) { |
460 | int err; | |
461 | ||
462 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); | |
463 | if (err) { | |
464 | put_page(page); | |
465 | hugetlb_put_quota(mapping); | |
466 | if (err == -EEXIST) | |
467 | goto retry; | |
468 | goto out; | |
469 | } | |
470 | } else | |
471 | lock_page(page); | |
472 | } | |
1e8f889b | 473 | |
ac9b9c66 | 474 | spin_lock(&mm->page_table_lock); |
4c887265 AL |
475 | size = i_size_read(mapping->host) >> HPAGE_SHIFT; |
476 | if (idx >= size) | |
477 | goto backout; | |
478 | ||
479 | ret = VM_FAULT_MINOR; | |
86e5216f | 480 | if (!pte_none(*ptep)) |
4c887265 AL |
481 | goto backout; |
482 | ||
483 | add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE); | |
1e8f889b DG |
484 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
485 | && (vma->vm_flags & VM_SHARED))); | |
486 | set_huge_pte_at(mm, address, ptep, new_pte); | |
487 | ||
488 | if (write_access && !(vma->vm_flags & VM_SHARED)) { | |
489 | /* Optimization, do the COW without a second fault */ | |
490 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte); | |
491 | } | |
492 | ||
ac9b9c66 | 493 | spin_unlock(&mm->page_table_lock); |
4c887265 AL |
494 | unlock_page(page); |
495 | out: | |
ac9b9c66 | 496 | return ret; |
4c887265 AL |
497 | |
498 | backout: | |
499 | spin_unlock(&mm->page_table_lock); | |
500 | hugetlb_put_quota(mapping); | |
501 | unlock_page(page); | |
502 | put_page(page); | |
503 | goto out; | |
ac9b9c66 HD |
504 | } |
505 | ||
86e5216f AL |
506 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
507 | unsigned long address, int write_access) | |
508 | { | |
509 | pte_t *ptep; | |
510 | pte_t entry; | |
1e8f889b | 511 | int ret; |
86e5216f AL |
512 | |
513 | ptep = huge_pte_alloc(mm, address); | |
514 | if (!ptep) | |
515 | return VM_FAULT_OOM; | |
516 | ||
517 | entry = *ptep; | |
518 | if (pte_none(entry)) | |
1e8f889b | 519 | return hugetlb_no_page(mm, vma, address, ptep, write_access); |
86e5216f | 520 | |
1e8f889b DG |
521 | ret = VM_FAULT_MINOR; |
522 | ||
523 | spin_lock(&mm->page_table_lock); | |
524 | /* Check for a racing update before calling hugetlb_cow */ | |
525 | if (likely(pte_same(entry, *ptep))) | |
526 | if (write_access && !pte_write(entry)) | |
527 | ret = hugetlb_cow(mm, vma, address, ptep, entry); | |
528 | spin_unlock(&mm->page_table_lock); | |
529 | ||
530 | return ret; | |
86e5216f AL |
531 | } |
532 | ||
63551ae0 DG |
533 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
534 | struct page **pages, struct vm_area_struct **vmas, | |
535 | unsigned long *position, int *length, int i) | |
536 | { | |
537 | unsigned long vpfn, vaddr = *position; | |
538 | int remainder = *length; | |
539 | ||
63551ae0 | 540 | vpfn = vaddr/PAGE_SIZE; |
1c59827d | 541 | spin_lock(&mm->page_table_lock); |
63551ae0 | 542 | while (vaddr < vma->vm_end && remainder) { |
4c887265 AL |
543 | pte_t *pte; |
544 | struct page *page; | |
63551ae0 | 545 | |
4c887265 AL |
546 | /* |
547 | * Some archs (sparc64, sh*) have multiple pte_ts to | |
548 | * each hugepage. We have to make * sure we get the | |
549 | * first, for the page indexing below to work. | |
550 | */ | |
551 | pte = huge_pte_offset(mm, vaddr & HPAGE_MASK); | |
63551ae0 | 552 | |
4c887265 AL |
553 | if (!pte || pte_none(*pte)) { |
554 | int ret; | |
63551ae0 | 555 | |
4c887265 AL |
556 | spin_unlock(&mm->page_table_lock); |
557 | ret = hugetlb_fault(mm, vma, vaddr, 0); | |
558 | spin_lock(&mm->page_table_lock); | |
559 | if (ret == VM_FAULT_MINOR) | |
560 | continue; | |
63551ae0 | 561 | |
4c887265 AL |
562 | remainder = 0; |
563 | if (!i) | |
564 | i = -EFAULT; | |
565 | break; | |
566 | } | |
567 | ||
568 | if (pages) { | |
569 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
63551ae0 DG |
570 | get_page(page); |
571 | pages[i] = page; | |
572 | } | |
573 | ||
574 | if (vmas) | |
575 | vmas[i] = vma; | |
576 | ||
577 | vaddr += PAGE_SIZE; | |
578 | ++vpfn; | |
579 | --remainder; | |
580 | ++i; | |
581 | } | |
1c59827d | 582 | spin_unlock(&mm->page_table_lock); |
63551ae0 DG |
583 | *length = remainder; |
584 | *position = vaddr; | |
585 | ||
586 | return i; | |
587 | } |