Root/
Source at commit 6c17a31f1fc515425221067cb3ece599c09dbc5d created 12 years 8 months ago. By Werner Almesberger, atusb, atben: moved from spi/ to ieee802154/; renamed atusb to spi_atusb | |
---|---|
1 | /* |
2 | * linux/mm/mlock.c |
3 | * |
4 | * (C) Copyright 1995 Linus Torvalds |
5 | * (C) Copyright 2002 Christoph Hellwig |
6 | */ |
7 | |
8 | #include <linux/capability.h> |
9 | #include <linux/mman.h> |
10 | #include <linux/mm.h> |
11 | #include <linux/swap.h> |
12 | #include <linux/swapops.h> |
13 | #include <linux/pagemap.h> |
14 | #include <linux/mempolicy.h> |
15 | #include <linux/syscalls.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/module.h> |
18 | #include <linux/rmap.h> |
19 | #include <linux/mmzone.h> |
20 | #include <linux/hugetlb.h> |
21 | |
22 | #include "internal.h" |
23 | |
24 | int can_do_mlock(void) |
25 | { |
26 | if (capable(CAP_IPC_LOCK)) |
27 | return 1; |
28 | if (rlimit(RLIMIT_MEMLOCK) != 0) |
29 | return 1; |
30 | return 0; |
31 | } |
32 | EXPORT_SYMBOL(can_do_mlock); |
33 | |
34 | /* |
35 | * Mlocked pages are marked with PageMlocked() flag for efficient testing |
36 | * in vmscan and, possibly, the fault path; and to support semi-accurate |
37 | * statistics. |
38 | * |
39 | * An mlocked page [PageMlocked(page)] is unevictable. As such, it will |
40 | * be placed on the LRU "unevictable" list, rather than the [in]active lists. |
41 | * The unevictable list is an LRU sibling list to the [in]active lists. |
42 | * PageUnevictable is set to indicate the unevictable state. |
43 | * |
44 | * When lazy mlocking via vmscan, it is important to ensure that the |
45 | * vma's VM_LOCKED status is not concurrently being modified, otherwise we |
46 | * may have mlocked a page that is being munlocked. So lazy mlock must take |
47 | * the mmap_sem for read, and verify that the vma really is locked |
48 | * (see mm/rmap.c). |
49 | */ |
50 | |
51 | /* |
52 | * LRU accounting for clear_page_mlock() |
53 | */ |
54 | void __clear_page_mlock(struct page *page) |
55 | { |
56 | VM_BUG_ON(!PageLocked(page)); |
57 | |
58 | if (!page->mapping) { /* truncated ? */ |
59 | return; |
60 | } |
61 | |
62 | dec_zone_page_state(page, NR_MLOCK); |
63 | count_vm_event(UNEVICTABLE_PGCLEARED); |
64 | if (!isolate_lru_page(page)) { |
65 | putback_lru_page(page); |
66 | } else { |
67 | /* |
68 | * We lost the race. the page already moved to evictable list. |
69 | */ |
70 | if (PageUnevictable(page)) |
71 | count_vm_event(UNEVICTABLE_PGSTRANDED); |
72 | } |
73 | } |
74 | |
75 | /* |
76 | * Mark page as mlocked if not already. |
77 | * If page on LRU, isolate and putback to move to unevictable list. |
78 | */ |
79 | void mlock_vma_page(struct page *page) |
80 | { |
81 | BUG_ON(!PageLocked(page)); |
82 | |
83 | if (!TestSetPageMlocked(page)) { |
84 | inc_zone_page_state(page, NR_MLOCK); |
85 | count_vm_event(UNEVICTABLE_PGMLOCKED); |
86 | if (!isolate_lru_page(page)) |
87 | putback_lru_page(page); |
88 | } |
89 | } |
90 | |
91 | /** |
92 | * munlock_vma_page - munlock a vma page |
93 | * @page - page to be unlocked |
94 | * |
95 | * called from munlock()/munmap() path with page supposedly on the LRU. |
96 | * When we munlock a page, because the vma where we found the page is being |
97 | * munlock()ed or munmap()ed, we want to check whether other vmas hold the |
98 | * page locked so that we can leave it on the unevictable lru list and not |
99 | * bother vmscan with it. However, to walk the page's rmap list in |
100 | * try_to_munlock() we must isolate the page from the LRU. If some other |
101 | * task has removed the page from the LRU, we won't be able to do that. |
102 | * So we clear the PageMlocked as we might not get another chance. If we |
103 | * can't isolate the page, we leave it for putback_lru_page() and vmscan |
104 | * [page_referenced()/try_to_unmap()] to deal with. |
105 | */ |
106 | void munlock_vma_page(struct page *page) |
107 | { |
108 | BUG_ON(!PageLocked(page)); |
109 | |
110 | if (TestClearPageMlocked(page)) { |
111 | dec_zone_page_state(page, NR_MLOCK); |
112 | if (!isolate_lru_page(page)) { |
113 | int ret = try_to_munlock(page); |
114 | /* |
115 | * did try_to_unlock() succeed or punt? |
116 | */ |
117 | if (ret != SWAP_MLOCK) |
118 | count_vm_event(UNEVICTABLE_PGMUNLOCKED); |
119 | |
120 | putback_lru_page(page); |
121 | } else { |
122 | /* |
123 | * Some other task has removed the page from the LRU. |
124 | * putback_lru_page() will take care of removing the |
125 | * page from the unevictable list, if necessary. |
126 | * vmscan [page_referenced()] will move the page back |
127 | * to the unevictable list if some other vma has it |
128 | * mlocked. |
129 | */ |
130 | if (PageUnevictable(page)) |
131 | count_vm_event(UNEVICTABLE_PGSTRANDED); |
132 | else |
133 | count_vm_event(UNEVICTABLE_PGMUNLOCKED); |
134 | } |
135 | } |
136 | } |
137 | |
138 | static inline int stack_guard_page(struct vm_area_struct *vma, unsigned long addr) |
139 | { |
140 | return (vma->vm_flags & VM_GROWSDOWN) && |
141 | (vma->vm_start == addr) && |
142 | !vma_stack_continue(vma->vm_prev, addr); |
143 | } |
144 | |
145 | /** |
146 | * __mlock_vma_pages_range() - mlock a range of pages in the vma. |
147 | * @vma: target vma |
148 | * @start: start address |
149 | * @end: end address |
150 | * |
151 | * This takes care of making the pages present too. |
152 | * |
153 | * return 0 on success, negative error code on error. |
154 | * |
155 | * vma->vm_mm->mmap_sem must be held for at least read. |
156 | */ |
157 | static long __mlock_vma_pages_range(struct vm_area_struct *vma, |
158 | unsigned long start, unsigned long end, |
159 | int *nonblocking) |
160 | { |
161 | struct mm_struct *mm = vma->vm_mm; |
162 | unsigned long addr = start; |
163 | int nr_pages = (end - start) / PAGE_SIZE; |
164 | int gup_flags; |
165 | |
166 | VM_BUG_ON(start & ~PAGE_MASK); |
167 | VM_BUG_ON(end & ~PAGE_MASK); |
168 | VM_BUG_ON(start < vma->vm_start); |
169 | VM_BUG_ON(end > vma->vm_end); |
170 | VM_BUG_ON(!rwsem_is_locked(&mm->mmap_sem)); |
171 | |
172 | gup_flags = FOLL_TOUCH; |
173 | /* |
174 | * We want to touch writable mappings with a write fault in order |
175 | * to break COW, except for shared mappings because these don't COW |
176 | * and we would not want to dirty them for nothing. |
177 | */ |
178 | if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE) |
179 | gup_flags |= FOLL_WRITE; |
180 | |
181 | /* |
182 | * We want mlock to succeed for regions that have any permissions |
183 | * other than PROT_NONE. |
184 | */ |
185 | if (vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)) |
186 | gup_flags |= FOLL_FORCE; |
187 | |
188 | if (vma->vm_flags & VM_LOCKED) |
189 | gup_flags |= FOLL_MLOCK; |
190 | |
191 | /* We don't try to access the guard page of a stack vma */ |
192 | if (stack_guard_page(vma, start)) { |
193 | addr += PAGE_SIZE; |
194 | nr_pages--; |
195 | } |
196 | |
197 | return __get_user_pages(current, mm, addr, nr_pages, gup_flags, |
198 | NULL, NULL, nonblocking); |
199 | } |
200 | |
201 | /* |
202 | * convert get_user_pages() return value to posix mlock() error |
203 | */ |
204 | static int __mlock_posix_error_return(long retval) |
205 | { |
206 | if (retval == -EFAULT) |
207 | retval = -ENOMEM; |
208 | else if (retval == -ENOMEM) |
209 | retval = -EAGAIN; |
210 | return retval; |
211 | } |
212 | |
213 | /** |
214 | * mlock_vma_pages_range() - mlock pages in specified vma range. |
215 | * @vma - the vma containing the specfied address range |
216 | * @start - starting address in @vma to mlock |
217 | * @end - end address [+1] in @vma to mlock |
218 | * |
219 | * For mmap()/mremap()/expansion of mlocked vma. |
220 | * |
221 | * return 0 on success for "normal" vmas. |
222 | * |
223 | * return number of pages [> 0] to be removed from locked_vm on success |
224 | * of "special" vmas. |
225 | */ |
226 | long mlock_vma_pages_range(struct vm_area_struct *vma, |
227 | unsigned long start, unsigned long end) |
228 | { |
229 | int nr_pages = (end - start) / PAGE_SIZE; |
230 | BUG_ON(!(vma->vm_flags & VM_LOCKED)); |
231 | |
232 | /* |
233 | * filter unlockable vmas |
234 | */ |
235 | if (vma->vm_flags & (VM_IO | VM_PFNMAP)) |
236 | goto no_mlock; |
237 | |
238 | if (!((vma->vm_flags & (VM_DONTEXPAND | VM_RESERVED)) || |
239 | is_vm_hugetlb_page(vma) || |
240 | vma == get_gate_vma(current))) { |
241 | |
242 | __mlock_vma_pages_range(vma, start, end, NULL); |
243 | |
244 | /* Hide errors from mmap() and other callers */ |
245 | return 0; |
246 | } |
247 | |
248 | /* |
249 | * User mapped kernel pages or huge pages: |
250 | * make these pages present to populate the ptes, but |
251 | * fall thru' to reset VM_LOCKED--no need to unlock, and |
252 | * return nr_pages so these don't get counted against task's |
253 | * locked limit. huge pages are already counted against |
254 | * locked vm limit. |
255 | */ |
256 | make_pages_present(start, end); |
257 | |
258 | no_mlock: |
259 | vma->vm_flags &= ~VM_LOCKED; /* and don't come back! */ |
260 | return nr_pages; /* error or pages NOT mlocked */ |
261 | } |
262 | |
263 | /* |
264 | * munlock_vma_pages_range() - munlock all pages in the vma range.' |
265 | * @vma - vma containing range to be munlock()ed. |
266 | * @start - start address in @vma of the range |
267 | * @end - end of range in @vma. |
268 | * |
269 | * For mremap(), munmap() and exit(). |
270 | * |
271 | * Called with @vma VM_LOCKED. |
272 | * |
273 | * Returns with VM_LOCKED cleared. Callers must be prepared to |
274 | * deal with this. |
275 | * |
276 | * We don't save and restore VM_LOCKED here because pages are |
277 | * still on lru. In unmap path, pages might be scanned by reclaim |
278 | * and re-mlocked by try_to_{munlock|unmap} before we unmap and |
279 | * free them. This will result in freeing mlocked pages. |
280 | */ |
281 | void munlock_vma_pages_range(struct vm_area_struct *vma, |
282 | unsigned long start, unsigned long end) |
283 | { |
284 | unsigned long addr; |
285 | |
286 | lru_add_drain(); |
287 | vma->vm_flags &= ~VM_LOCKED; |
288 | |
289 | for (addr = start; addr < end; addr += PAGE_SIZE) { |
290 | struct page *page; |
291 | /* |
292 | * Although FOLL_DUMP is intended for get_dump_page(), |
293 | * it just so happens that its special treatment of the |
294 | * ZERO_PAGE (returning an error instead of doing get_page) |
295 | * suits munlock very well (and if somehow an abnormal page |
296 | * has sneaked into the range, we won't oops here: great). |
297 | */ |
298 | page = follow_page(vma, addr, FOLL_GET | FOLL_DUMP); |
299 | if (page && !IS_ERR(page)) { |
300 | lock_page(page); |
301 | /* |
302 | * Like in __mlock_vma_pages_range(), |
303 | * because we lock page here and migration is |
304 | * blocked by the elevated reference, we need |
305 | * only check for file-cache page truncation. |
306 | */ |
307 | if (page->mapping) |
308 | munlock_vma_page(page); |
309 | unlock_page(page); |
310 | put_page(page); |
311 | } |
312 | cond_resched(); |
313 | } |
314 | } |
315 | |
316 | /* |
317 | * mlock_fixup - handle mlock[all]/munlock[all] requests. |
318 | * |
319 | * Filters out "special" vmas -- VM_LOCKED never gets set for these, and |
320 | * munlock is a no-op. However, for some special vmas, we go ahead and |
321 | * populate the ptes via make_pages_present(). |
322 | * |
323 | * For vmas that pass the filters, merge/split as appropriate. |
324 | */ |
325 | static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev, |
326 | unsigned long start, unsigned long end, unsigned int newflags) |
327 | { |
328 | struct mm_struct *mm = vma->vm_mm; |
329 | pgoff_t pgoff; |
330 | int nr_pages; |
331 | int ret = 0; |
332 | int lock = newflags & VM_LOCKED; |
333 | |
334 | if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) || |
335 | is_vm_hugetlb_page(vma) || vma == get_gate_vma(current)) |
336 | goto out; /* don't set VM_LOCKED, don't count */ |
337 | |
338 | pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); |
339 | *prev = vma_merge(mm, *prev, start, end, newflags, vma->anon_vma, |
340 | vma->vm_file, pgoff, vma_policy(vma)); |
341 | if (*prev) { |
342 | vma = *prev; |
343 | goto success; |
344 | } |
345 | |
346 | if (start != vma->vm_start) { |
347 | ret = split_vma(mm, vma, start, 1); |
348 | if (ret) |
349 | goto out; |
350 | } |
351 | |
352 | if (end != vma->vm_end) { |
353 | ret = split_vma(mm, vma, end, 0); |
354 | if (ret) |
355 | goto out; |
356 | } |
357 | |
358 | success: |
359 | /* |
360 | * Keep track of amount of locked VM. |
361 | */ |
362 | nr_pages = (end - start) >> PAGE_SHIFT; |
363 | if (!lock) |
364 | nr_pages = -nr_pages; |
365 | mm->locked_vm += nr_pages; |
366 | |
367 | /* |
368 | * vm_flags is protected by the mmap_sem held in write mode. |
369 | * It's okay if try_to_unmap_one unmaps a page just after we |
370 | * set VM_LOCKED, __mlock_vma_pages_range will bring it back. |
371 | */ |
372 | |
373 | if (lock) |
374 | vma->vm_flags = newflags; |
375 | else |
376 | munlock_vma_pages_range(vma, start, end); |
377 | |
378 | out: |
379 | *prev = vma; |
380 | return ret; |
381 | } |
382 | |
383 | static int do_mlock(unsigned long start, size_t len, int on) |
384 | { |
385 | unsigned long nstart, end, tmp; |
386 | struct vm_area_struct * vma, * prev; |
387 | int error; |
388 | |
389 | VM_BUG_ON(start & ~PAGE_MASK); |
390 | VM_BUG_ON(len != PAGE_ALIGN(len)); |
391 | end = start + len; |
392 | if (end < start) |
393 | return -EINVAL; |
394 | if (end == start) |
395 | return 0; |
396 | vma = find_vma_prev(current->mm, start, &prev); |
397 | if (!vma || vma->vm_start > start) |
398 | return -ENOMEM; |
399 | |
400 | if (start > vma->vm_start) |
401 | prev = vma; |
402 | |
403 | for (nstart = start ; ; ) { |
404 | unsigned int newflags; |
405 | |
406 | /* Here we know that vma->vm_start <= nstart < vma->vm_end. */ |
407 | |
408 | newflags = vma->vm_flags | VM_LOCKED; |
409 | if (!on) |
410 | newflags &= ~VM_LOCKED; |
411 | |
412 | tmp = vma->vm_end; |
413 | if (tmp > end) |
414 | tmp = end; |
415 | error = mlock_fixup(vma, &prev, nstart, tmp, newflags); |
416 | if (error) |
417 | break; |
418 | nstart = tmp; |
419 | if (nstart < prev->vm_end) |
420 | nstart = prev->vm_end; |
421 | if (nstart >= end) |
422 | break; |
423 | |
424 | vma = prev->vm_next; |
425 | if (!vma || vma->vm_start != nstart) { |
426 | error = -ENOMEM; |
427 | break; |
428 | } |
429 | } |
430 | return error; |
431 | } |
432 | |
433 | static int do_mlock_pages(unsigned long start, size_t len, int ignore_errors) |
434 | { |
435 | struct mm_struct *mm = current->mm; |
436 | unsigned long end, nstart, nend; |
437 | struct vm_area_struct *vma = NULL; |
438 | int locked = 0; |
439 | int ret = 0; |
440 | |
441 | VM_BUG_ON(start & ~PAGE_MASK); |
442 | VM_BUG_ON(len != PAGE_ALIGN(len)); |
443 | end = start + len; |
444 | |
445 | for (nstart = start; nstart < end; nstart = nend) { |
446 | /* |
447 | * We want to fault in pages for [nstart; end) address range. |
448 | * Find first corresponding VMA. |
449 | */ |
450 | if (!locked) { |
451 | locked = 1; |
452 | down_read(&mm->mmap_sem); |
453 | vma = find_vma(mm, nstart); |
454 | } else if (nstart >= vma->vm_end) |
455 | vma = vma->vm_next; |
456 | if (!vma || vma->vm_start >= end) |
457 | break; |
458 | /* |
459 | * Set [nstart; nend) to intersection of desired address |
460 | * range with the first VMA. Also, skip undesirable VMA types. |
461 | */ |
462 | nend = min(end, vma->vm_end); |
463 | if (vma->vm_flags & (VM_IO | VM_PFNMAP)) |
464 | continue; |
465 | if (nstart < vma->vm_start) |
466 | nstart = vma->vm_start; |
467 | /* |
468 | * Now fault in a range of pages. __mlock_vma_pages_range() |
469 | * double checks the vma flags, so that it won't mlock pages |
470 | * if the vma was already munlocked. |
471 | */ |
472 | ret = __mlock_vma_pages_range(vma, nstart, nend, &locked); |
473 | if (ret < 0) { |
474 | if (ignore_errors) { |
475 | ret = 0; |
476 | continue; /* continue at next VMA */ |
477 | } |
478 | ret = __mlock_posix_error_return(ret); |
479 | break; |
480 | } |
481 | nend = nstart + ret * PAGE_SIZE; |
482 | ret = 0; |
483 | } |
484 | if (locked) |
485 | up_read(&mm->mmap_sem); |
486 | return ret; /* 0 or negative error code */ |
487 | } |
488 | |
489 | SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) |
490 | { |
491 | unsigned long locked; |
492 | unsigned long lock_limit; |
493 | int error = -ENOMEM; |
494 | |
495 | if (!can_do_mlock()) |
496 | return -EPERM; |
497 | |
498 | lru_add_drain_all(); /* flush pagevec */ |
499 | |
500 | down_write(¤t->mm->mmap_sem); |
501 | len = PAGE_ALIGN(len + (start & ~PAGE_MASK)); |
502 | start &= PAGE_MASK; |
503 | |
504 | locked = len >> PAGE_SHIFT; |
505 | locked += current->mm->locked_vm; |
506 | |
507 | lock_limit = rlimit(RLIMIT_MEMLOCK); |
508 | lock_limit >>= PAGE_SHIFT; |
509 | |
510 | /* check against resource limits */ |
511 | if ((locked <= lock_limit) || capable(CAP_IPC_LOCK)) |
512 | error = do_mlock(start, len, 1); |
513 | up_write(¤t->mm->mmap_sem); |
514 | if (!error) |
515 | error = do_mlock_pages(start, len, 0); |
516 | return error; |
517 | } |
518 | |
519 | SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) |
520 | { |
521 | int ret; |
522 | |
523 | down_write(¤t->mm->mmap_sem); |
524 | len = PAGE_ALIGN(len + (start & ~PAGE_MASK)); |
525 | start &= PAGE_MASK; |
526 | ret = do_mlock(start, len, 0); |
527 | up_write(¤t->mm->mmap_sem); |
528 | return ret; |
529 | } |
530 | |
531 | static int do_mlockall(int flags) |
532 | { |
533 | struct vm_area_struct * vma, * prev = NULL; |
534 | unsigned int def_flags = 0; |
535 | |
536 | if (flags & MCL_FUTURE) |
537 | def_flags = VM_LOCKED; |
538 | current->mm->def_flags = def_flags; |
539 | if (flags == MCL_FUTURE) |
540 | goto out; |
541 | |
542 | for (vma = current->mm->mmap; vma ; vma = prev->vm_next) { |
543 | unsigned int newflags; |
544 | |
545 | newflags = vma->vm_flags | VM_LOCKED; |
546 | if (!(flags & MCL_CURRENT)) |
547 | newflags &= ~VM_LOCKED; |
548 | |
549 | /* Ignore errors */ |
550 | mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags); |
551 | } |
552 | out: |
553 | return 0; |
554 | } |
555 | |
556 | SYSCALL_DEFINE1(mlockall, int, flags) |
557 | { |
558 | unsigned long lock_limit; |
559 | int ret = -EINVAL; |
560 | |
561 | if (!flags || (flags & ~(MCL_CURRENT | MCL_FUTURE))) |
562 | goto out; |
563 | |
564 | ret = -EPERM; |
565 | if (!can_do_mlock()) |
566 | goto out; |
567 | |
568 | lru_add_drain_all(); /* flush pagevec */ |
569 | |
570 | down_write(¤t->mm->mmap_sem); |
571 | |
572 | lock_limit = rlimit(RLIMIT_MEMLOCK); |
573 | lock_limit >>= PAGE_SHIFT; |
574 | |
575 | ret = -ENOMEM; |
576 | if (!(flags & MCL_CURRENT) || (current->mm->total_vm <= lock_limit) || |
577 | capable(CAP_IPC_LOCK)) |
578 | ret = do_mlockall(flags); |
579 | up_write(¤t->mm->mmap_sem); |
580 | if (!ret && (flags & MCL_CURRENT)) { |
581 | /* Ignore errors */ |
582 | do_mlock_pages(0, TASK_SIZE, 1); |
583 | } |
584 | out: |
585 | return ret; |
586 | } |
587 | |
588 | SYSCALL_DEFINE0(munlockall) |
589 | { |
590 | int ret; |
591 | |
592 | down_write(¤t->mm->mmap_sem); |
593 | ret = do_mlockall(0); |
594 | up_write(¤t->mm->mmap_sem); |
595 | return ret; |
596 | } |
597 | |
598 | /* |
599 | * Objects with different lifetime than processes (SHM_LOCK and SHM_HUGETLB |
600 | * shm segments) get accounted against the user_struct instead. |
601 | */ |
602 | static DEFINE_SPINLOCK(shmlock_user_lock); |
603 | |
604 | int user_shm_lock(size_t size, struct user_struct *user) |
605 | { |
606 | unsigned long lock_limit, locked; |
607 | int allowed = 0; |
608 | |
609 | locked = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
610 | lock_limit = rlimit(RLIMIT_MEMLOCK); |
611 | if (lock_limit == RLIM_INFINITY) |
612 | allowed = 1; |
613 | lock_limit >>= PAGE_SHIFT; |
614 | spin_lock(&shmlock_user_lock); |
615 | if (!allowed && |
616 | locked + user->locked_shm > lock_limit && !capable(CAP_IPC_LOCK)) |
617 | goto out; |
618 | get_uid(user); |
619 | user->locked_shm += locked; |
620 | allowed = 1; |
621 | out: |
622 | spin_unlock(&shmlock_user_lock); |
623 | return allowed; |
624 | } |
625 | |
626 | void user_shm_unlock(size_t size, struct user_struct *user) |
627 | { |
628 | spin_lock(&shmlock_user_lock); |
629 | user->locked_shm -= (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
630 | spin_unlock(&shmlock_user_lock); |
631 | free_uid(user); |
632 | } |
633 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9