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 | 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 | ||
a482289d | 67 | static int alloc_fresh_huge_page(void) |
1da177e4 LT |
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) { | |
a482289d | 75 | page[1].lru.next = (void *)free_huge_page; /* dtor */ |
0bd0f9fb | 76 | spin_lock(&hugetlb_lock); |
1da177e4 LT |
77 | nr_huge_pages++; |
78 | nr_huge_pages_node[page_to_nid(page)]++; | |
0bd0f9fb | 79 | spin_unlock(&hugetlb_lock); |
a482289d NP |
80 | put_page(page); /* free it into the hugepage allocator */ |
81 | return 1; | |
1da177e4 | 82 | } |
a482289d | 83 | return 0; |
1da177e4 LT |
84 | } |
85 | ||
86 | void free_huge_page(struct page *page) | |
87 | { | |
88 | BUG_ON(page_count(page)); | |
89 | ||
90 | INIT_LIST_HEAD(&page->lru); | |
1da177e4 LT |
91 | |
92 | spin_lock(&hugetlb_lock); | |
93 | enqueue_huge_page(page); | |
94 | spin_unlock(&hugetlb_lock); | |
95 | } | |
96 | ||
5da7ca86 | 97 | struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr) |
1da177e4 LT |
98 | { |
99 | struct page *page; | |
100 | int i; | |
101 | ||
102 | spin_lock(&hugetlb_lock); | |
5da7ca86 | 103 | page = dequeue_huge_page(vma, addr); |
1da177e4 LT |
104 | if (!page) { |
105 | spin_unlock(&hugetlb_lock); | |
106 | return NULL; | |
107 | } | |
108 | spin_unlock(&hugetlb_lock); | |
109 | set_page_count(page, 1); | |
1da177e4 | 110 | for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i) |
a2dfef69 | 111 | clear_user_highpage(&page[i], addr); |
1da177e4 LT |
112 | return page; |
113 | } | |
114 | ||
115 | static int __init hugetlb_init(void) | |
116 | { | |
117 | unsigned long i; | |
1da177e4 | 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) { | |
a482289d | 126 | if (!alloc_fresh_huge_page()) |
1da177e4 | 127 | break; |
1da177e4 LT |
128 | } |
129 | max_huge_pages = free_huge_pages = nr_huge_pages = i; | |
130 | printk("Total HugeTLB memory allocated, %ld\n", free_huge_pages); | |
131 | return 0; | |
132 | } | |
133 | module_init(hugetlb_init); | |
134 | ||
135 | static int __init hugetlb_setup(char *s) | |
136 | { | |
137 | if (sscanf(s, "%lu", &max_huge_pages) <= 0) | |
138 | max_huge_pages = 0; | |
139 | return 1; | |
140 | } | |
141 | __setup("hugepages=", hugetlb_setup); | |
142 | ||
143 | #ifdef CONFIG_SYSCTL | |
144 | static void update_and_free_page(struct page *page) | |
145 | { | |
146 | int i; | |
147 | nr_huge_pages--; | |
148 | nr_huge_pages_node[page_zone(page)->zone_pgdat->node_id]--; | |
149 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) { | |
150 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | | |
151 | 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved | | |
152 | 1 << PG_private | 1<< PG_writeback); | |
1da177e4 | 153 | } |
a482289d | 154 | page[1].lru.next = NULL; |
1da177e4 LT |
155 | set_page_count(page, 1); |
156 | __free_pages(page, HUGETLB_PAGE_ORDER); | |
157 | } | |
158 | ||
159 | #ifdef CONFIG_HIGHMEM | |
160 | static void try_to_free_low(unsigned long count) | |
161 | { | |
162 | int i, nid; | |
163 | for (i = 0; i < MAX_NUMNODES; ++i) { | |
164 | struct page *page, *next; | |
165 | list_for_each_entry_safe(page, next, &hugepage_freelists[i], lru) { | |
166 | if (PageHighMem(page)) | |
167 | continue; | |
168 | list_del(&page->lru); | |
169 | update_and_free_page(page); | |
170 | nid = page_zone(page)->zone_pgdat->node_id; | |
171 | free_huge_pages--; | |
172 | free_huge_pages_node[nid]--; | |
173 | if (count >= nr_huge_pages) | |
174 | return; | |
175 | } | |
176 | } | |
177 | } | |
178 | #else | |
179 | static inline void try_to_free_low(unsigned long count) | |
180 | { | |
181 | } | |
182 | #endif | |
183 | ||
184 | static unsigned long set_max_huge_pages(unsigned long count) | |
185 | { | |
186 | while (count > nr_huge_pages) { | |
a482289d | 187 | if (!alloc_fresh_huge_page()) |
1da177e4 | 188 | return nr_huge_pages; |
1da177e4 LT |
189 | } |
190 | if (count >= nr_huge_pages) | |
191 | return nr_huge_pages; | |
192 | ||
193 | spin_lock(&hugetlb_lock); | |
194 | try_to_free_low(count); | |
195 | while (count < nr_huge_pages) { | |
5da7ca86 | 196 | struct page *page = dequeue_huge_page(NULL, 0); |
1da177e4 LT |
197 | if (!page) |
198 | break; | |
199 | update_and_free_page(page); | |
200 | } | |
201 | spin_unlock(&hugetlb_lock); | |
202 | return nr_huge_pages; | |
203 | } | |
204 | ||
205 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, | |
206 | struct file *file, void __user *buffer, | |
207 | size_t *length, loff_t *ppos) | |
208 | { | |
209 | proc_doulongvec_minmax(table, write, file, buffer, length, ppos); | |
210 | max_huge_pages = set_max_huge_pages(max_huge_pages); | |
211 | return 0; | |
212 | } | |
213 | #endif /* CONFIG_SYSCTL */ | |
214 | ||
215 | int hugetlb_report_meminfo(char *buf) | |
216 | { | |
217 | return sprintf(buf, | |
218 | "HugePages_Total: %5lu\n" | |
219 | "HugePages_Free: %5lu\n" | |
220 | "Hugepagesize: %5lu kB\n", | |
221 | nr_huge_pages, | |
222 | free_huge_pages, | |
223 | HPAGE_SIZE/1024); | |
224 | } | |
225 | ||
226 | int hugetlb_report_node_meminfo(int nid, char *buf) | |
227 | { | |
228 | return sprintf(buf, | |
229 | "Node %d HugePages_Total: %5u\n" | |
230 | "Node %d HugePages_Free: %5u\n", | |
231 | nid, nr_huge_pages_node[nid], | |
232 | nid, free_huge_pages_node[nid]); | |
233 | } | |
234 | ||
235 | int is_hugepage_mem_enough(size_t size) | |
236 | { | |
237 | return (size + ~HPAGE_MASK)/HPAGE_SIZE <= free_huge_pages; | |
238 | } | |
239 | ||
240 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ | |
241 | unsigned long hugetlb_total_pages(void) | |
242 | { | |
243 | return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE); | |
244 | } | |
1da177e4 LT |
245 | |
246 | /* | |
247 | * We cannot handle pagefaults against hugetlb pages at all. They cause | |
248 | * handle_mm_fault() to try to instantiate regular-sized pages in the | |
249 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get | |
250 | * this far. | |
251 | */ | |
252 | static struct page *hugetlb_nopage(struct vm_area_struct *vma, | |
253 | unsigned long address, int *unused) | |
254 | { | |
255 | BUG(); | |
256 | return NULL; | |
257 | } | |
258 | ||
259 | struct vm_operations_struct hugetlb_vm_ops = { | |
260 | .nopage = hugetlb_nopage, | |
261 | }; | |
262 | ||
1e8f889b DG |
263 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
264 | int writable) | |
63551ae0 DG |
265 | { |
266 | pte_t entry; | |
267 | ||
1e8f889b | 268 | if (writable) { |
63551ae0 DG |
269 | entry = |
270 | pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot))); | |
271 | } else { | |
272 | entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); | |
273 | } | |
274 | entry = pte_mkyoung(entry); | |
275 | entry = pte_mkhuge(entry); | |
276 | ||
277 | return entry; | |
278 | } | |
279 | ||
1e8f889b DG |
280 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
281 | unsigned long address, pte_t *ptep) | |
282 | { | |
283 | pte_t entry; | |
284 | ||
285 | entry = pte_mkwrite(pte_mkdirty(*ptep)); | |
286 | ptep_set_access_flags(vma, address, ptep, entry, 1); | |
287 | update_mmu_cache(vma, address, entry); | |
288 | lazy_mmu_prot_update(entry); | |
289 | } | |
290 | ||
291 | ||
63551ae0 DG |
292 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
293 | struct vm_area_struct *vma) | |
294 | { | |
295 | pte_t *src_pte, *dst_pte, entry; | |
296 | struct page *ptepage; | |
1c59827d | 297 | unsigned long addr; |
1e8f889b DG |
298 | int cow; |
299 | ||
300 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
63551ae0 | 301 | |
1c59827d | 302 | for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) { |
c74df32c HD |
303 | src_pte = huge_pte_offset(src, addr); |
304 | if (!src_pte) | |
305 | continue; | |
63551ae0 DG |
306 | dst_pte = huge_pte_alloc(dst, addr); |
307 | if (!dst_pte) | |
308 | goto nomem; | |
c74df32c | 309 | spin_lock(&dst->page_table_lock); |
1c59827d | 310 | spin_lock(&src->page_table_lock); |
c74df32c | 311 | if (!pte_none(*src_pte)) { |
1e8f889b DG |
312 | if (cow) |
313 | ptep_set_wrprotect(src, addr, src_pte); | |
1c59827d HD |
314 | entry = *src_pte; |
315 | ptepage = pte_page(entry); | |
316 | get_page(ptepage); | |
4294621f | 317 | add_mm_counter(dst, file_rss, HPAGE_SIZE / PAGE_SIZE); |
1c59827d HD |
318 | set_huge_pte_at(dst, addr, dst_pte, entry); |
319 | } | |
320 | spin_unlock(&src->page_table_lock); | |
c74df32c | 321 | spin_unlock(&dst->page_table_lock); |
63551ae0 DG |
322 | } |
323 | return 0; | |
324 | ||
325 | nomem: | |
326 | return -ENOMEM; | |
327 | } | |
328 | ||
329 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, | |
330 | unsigned long end) | |
331 | { | |
332 | struct mm_struct *mm = vma->vm_mm; | |
333 | unsigned long address; | |
c7546f8f | 334 | pte_t *ptep; |
63551ae0 DG |
335 | pte_t pte; |
336 | struct page *page; | |
337 | ||
338 | WARN_ON(!is_vm_hugetlb_page(vma)); | |
339 | BUG_ON(start & ~HPAGE_MASK); | |
340 | BUG_ON(end & ~HPAGE_MASK); | |
341 | ||
508034a3 HD |
342 | spin_lock(&mm->page_table_lock); |
343 | ||
365e9c87 HD |
344 | /* Update high watermark before we lower rss */ |
345 | update_hiwater_rss(mm); | |
346 | ||
63551ae0 | 347 | for (address = start; address < end; address += HPAGE_SIZE) { |
c7546f8f | 348 | ptep = huge_pte_offset(mm, address); |
4c887265 | 349 | if (!ptep) |
c7546f8f DG |
350 | continue; |
351 | ||
352 | pte = huge_ptep_get_and_clear(mm, address, ptep); | |
63551ae0 DG |
353 | if (pte_none(pte)) |
354 | continue; | |
c7546f8f | 355 | |
63551ae0 DG |
356 | page = pte_page(pte); |
357 | put_page(page); | |
4294621f | 358 | add_mm_counter(mm, file_rss, (int) -(HPAGE_SIZE / PAGE_SIZE)); |
63551ae0 | 359 | } |
63551ae0 | 360 | |
1da177e4 | 361 | spin_unlock(&mm->page_table_lock); |
508034a3 | 362 | flush_tlb_range(vma, start, end); |
1da177e4 | 363 | } |
63551ae0 | 364 | |
1e8f889b DG |
365 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
366 | unsigned long address, pte_t *ptep, pte_t pte) | |
367 | { | |
368 | struct page *old_page, *new_page; | |
369 | int i, avoidcopy; | |
370 | ||
371 | old_page = pte_page(pte); | |
372 | ||
373 | /* If no-one else is actually using this page, avoid the copy | |
374 | * and just make the page writable */ | |
375 | avoidcopy = (page_count(old_page) == 1); | |
376 | if (avoidcopy) { | |
377 | set_huge_ptep_writable(vma, address, ptep); | |
378 | return VM_FAULT_MINOR; | |
379 | } | |
380 | ||
381 | page_cache_get(old_page); | |
5da7ca86 | 382 | new_page = alloc_huge_page(vma, address); |
1e8f889b DG |
383 | |
384 | if (!new_page) { | |
385 | page_cache_release(old_page); | |
0df420d8 | 386 | return VM_FAULT_OOM; |
1e8f889b DG |
387 | } |
388 | ||
389 | spin_unlock(&mm->page_table_lock); | |
390 | for (i = 0; i < HPAGE_SIZE/PAGE_SIZE; i++) | |
391 | copy_user_highpage(new_page + i, old_page + i, | |
392 | address + i*PAGE_SIZE); | |
393 | spin_lock(&mm->page_table_lock); | |
394 | ||
395 | ptep = huge_pte_offset(mm, address & HPAGE_MASK); | |
396 | if (likely(pte_same(*ptep, pte))) { | |
397 | /* Break COW */ | |
398 | set_huge_pte_at(mm, address, ptep, | |
399 | make_huge_pte(vma, new_page, 1)); | |
400 | /* Make the old page be freed below */ | |
401 | new_page = old_page; | |
402 | } | |
403 | page_cache_release(new_page); | |
404 | page_cache_release(old_page); | |
405 | return VM_FAULT_MINOR; | |
406 | } | |
407 | ||
86e5216f | 408 | int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
1e8f889b | 409 | unsigned long address, pte_t *ptep, int write_access) |
ac9b9c66 HD |
410 | { |
411 | int ret = VM_FAULT_SIGBUS; | |
4c887265 AL |
412 | unsigned long idx; |
413 | unsigned long size; | |
4c887265 AL |
414 | struct page *page; |
415 | struct address_space *mapping; | |
1e8f889b | 416 | pte_t new_pte; |
4c887265 | 417 | |
4c887265 AL |
418 | mapping = vma->vm_file->f_mapping; |
419 | idx = ((address - vma->vm_start) >> HPAGE_SHIFT) | |
420 | + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT)); | |
421 | ||
422 | /* | |
423 | * Use page lock to guard against racing truncation | |
424 | * before we get page_table_lock. | |
425 | */ | |
6bda666a CL |
426 | retry: |
427 | page = find_lock_page(mapping, idx); | |
428 | if (!page) { | |
429 | if (hugetlb_get_quota(mapping)) | |
430 | goto out; | |
431 | page = alloc_huge_page(vma, address); | |
432 | if (!page) { | |
433 | hugetlb_put_quota(mapping); | |
0df420d8 | 434 | ret = VM_FAULT_OOM; |
6bda666a CL |
435 | goto out; |
436 | } | |
ac9b9c66 | 437 | |
6bda666a CL |
438 | if (vma->vm_flags & VM_SHARED) { |
439 | int err; | |
440 | ||
441 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); | |
442 | if (err) { | |
443 | put_page(page); | |
444 | hugetlb_put_quota(mapping); | |
445 | if (err == -EEXIST) | |
446 | goto retry; | |
447 | goto out; | |
448 | } | |
449 | } else | |
450 | lock_page(page); | |
451 | } | |
1e8f889b | 452 | |
ac9b9c66 | 453 | spin_lock(&mm->page_table_lock); |
4c887265 AL |
454 | size = i_size_read(mapping->host) >> HPAGE_SHIFT; |
455 | if (idx >= size) | |
456 | goto backout; | |
457 | ||
458 | ret = VM_FAULT_MINOR; | |
86e5216f | 459 | if (!pte_none(*ptep)) |
4c887265 AL |
460 | goto backout; |
461 | ||
462 | add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE); | |
1e8f889b DG |
463 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
464 | && (vma->vm_flags & VM_SHARED))); | |
465 | set_huge_pte_at(mm, address, ptep, new_pte); | |
466 | ||
467 | if (write_access && !(vma->vm_flags & VM_SHARED)) { | |
468 | /* Optimization, do the COW without a second fault */ | |
469 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte); | |
470 | } | |
471 | ||
ac9b9c66 | 472 | spin_unlock(&mm->page_table_lock); |
4c887265 AL |
473 | unlock_page(page); |
474 | out: | |
ac9b9c66 | 475 | return ret; |
4c887265 AL |
476 | |
477 | backout: | |
478 | spin_unlock(&mm->page_table_lock); | |
479 | hugetlb_put_quota(mapping); | |
480 | unlock_page(page); | |
481 | put_page(page); | |
482 | goto out; | |
ac9b9c66 HD |
483 | } |
484 | ||
86e5216f AL |
485 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
486 | unsigned long address, int write_access) | |
487 | { | |
488 | pte_t *ptep; | |
489 | pte_t entry; | |
1e8f889b | 490 | int ret; |
86e5216f AL |
491 | |
492 | ptep = huge_pte_alloc(mm, address); | |
493 | if (!ptep) | |
494 | return VM_FAULT_OOM; | |
495 | ||
496 | entry = *ptep; | |
497 | if (pte_none(entry)) | |
1e8f889b | 498 | return hugetlb_no_page(mm, vma, address, ptep, write_access); |
86e5216f | 499 | |
1e8f889b DG |
500 | ret = VM_FAULT_MINOR; |
501 | ||
502 | spin_lock(&mm->page_table_lock); | |
503 | /* Check for a racing update before calling hugetlb_cow */ | |
504 | if (likely(pte_same(entry, *ptep))) | |
505 | if (write_access && !pte_write(entry)) | |
506 | ret = hugetlb_cow(mm, vma, address, ptep, entry); | |
507 | spin_unlock(&mm->page_table_lock); | |
508 | ||
509 | return ret; | |
86e5216f AL |
510 | } |
511 | ||
63551ae0 DG |
512 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
513 | struct page **pages, struct vm_area_struct **vmas, | |
514 | unsigned long *position, int *length, int i) | |
515 | { | |
516 | unsigned long vpfn, vaddr = *position; | |
517 | int remainder = *length; | |
518 | ||
63551ae0 | 519 | vpfn = vaddr/PAGE_SIZE; |
1c59827d | 520 | spin_lock(&mm->page_table_lock); |
63551ae0 | 521 | while (vaddr < vma->vm_end && remainder) { |
4c887265 AL |
522 | pte_t *pte; |
523 | struct page *page; | |
63551ae0 | 524 | |
4c887265 AL |
525 | /* |
526 | * Some archs (sparc64, sh*) have multiple pte_ts to | |
527 | * each hugepage. We have to make * sure we get the | |
528 | * first, for the page indexing below to work. | |
529 | */ | |
530 | pte = huge_pte_offset(mm, vaddr & HPAGE_MASK); | |
63551ae0 | 531 | |
4c887265 AL |
532 | if (!pte || pte_none(*pte)) { |
533 | int ret; | |
63551ae0 | 534 | |
4c887265 AL |
535 | spin_unlock(&mm->page_table_lock); |
536 | ret = hugetlb_fault(mm, vma, vaddr, 0); | |
537 | spin_lock(&mm->page_table_lock); | |
538 | if (ret == VM_FAULT_MINOR) | |
539 | continue; | |
63551ae0 | 540 | |
4c887265 AL |
541 | remainder = 0; |
542 | if (!i) | |
543 | i = -EFAULT; | |
544 | break; | |
545 | } | |
546 | ||
547 | if (pages) { | |
548 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
63551ae0 DG |
549 | get_page(page); |
550 | pages[i] = page; | |
551 | } | |
552 | ||
553 | if (vmas) | |
554 | vmas[i] = vma; | |
555 | ||
556 | vaddr += PAGE_SIZE; | |
557 | ++vpfn; | |
558 | --remainder; | |
559 | ++i; | |
560 | } | |
1c59827d | 561 | spin_unlock(&mm->page_table_lock); |
63551ae0 DG |
562 | *length = remainder; |
563 | *position = vaddr; | |
564 | ||
565 | return i; | |
566 | } |