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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
cddb8a5c AA |
2 | #ifndef _LINUX_MMU_NOTIFIER_H |
3 | #define _LINUX_MMU_NOTIFIER_H | |
4 | ||
5 | #include <linux/list.h> | |
6 | #include <linux/spinlock.h> | |
7 | #include <linux/mm_types.h> | |
21a92735 | 8 | #include <linux/srcu.h> |
cddb8a5c AA |
9 | |
10 | struct mmu_notifier; | |
11 | struct mmu_notifier_ops; | |
12 | ||
13 | #ifdef CONFIG_MMU_NOTIFIER | |
14 | ||
15 | /* | |
16 | * The mmu notifier_mm structure is allocated and installed in | |
17 | * mm->mmu_notifier_mm inside the mm_take_all_locks() protected | |
18 | * critical section and it's released only when mm_count reaches zero | |
19 | * in mmdrop(). | |
20 | */ | |
21 | struct mmu_notifier_mm { | |
22 | /* all mmu notifiers registerd in this mm are queued in this list */ | |
23 | struct hlist_head list; | |
24 | /* to serialize the list modifications and hlist_unhashed */ | |
25 | spinlock_t lock; | |
26 | }; | |
27 | ||
5d6527a7 JG |
28 | struct mmu_notifier_range { |
29 | struct mm_struct *mm; | |
30 | unsigned long start; | |
31 | unsigned long end; | |
32 | bool blockable; | |
33 | }; | |
34 | ||
cddb8a5c AA |
35 | struct mmu_notifier_ops { |
36 | /* | |
37 | * Called either by mmu_notifier_unregister or when the mm is | |
38 | * being destroyed by exit_mmap, always before all pages are | |
39 | * freed. This can run concurrently with other mmu notifier | |
40 | * methods (the ones invoked outside the mm context) and it | |
41 | * should tear down all secondary mmu mappings and freeze the | |
42 | * secondary mmu. If this method isn't implemented you've to | |
43 | * be sure that nothing could possibly write to the pages | |
44 | * through the secondary mmu by the time the last thread with | |
45 | * tsk->mm == mm exits. | |
46 | * | |
47 | * As side note: the pages freed after ->release returns could | |
48 | * be immediately reallocated by the gart at an alias physical | |
49 | * address with a different cache model, so if ->release isn't | |
50 | * implemented because all _software_ driven memory accesses | |
51 | * through the secondary mmu are terminated by the time the | |
52 | * last thread of this mm quits, you've also to be sure that | |
53 | * speculative _hardware_ operations can't allocate dirty | |
54 | * cachelines in the cpu that could not be snooped and made | |
55 | * coherent with the other read and write operations happening | |
56 | * through the gart alias address, so leading to memory | |
57 | * corruption. | |
58 | */ | |
59 | void (*release)(struct mmu_notifier *mn, | |
60 | struct mm_struct *mm); | |
61 | ||
62 | /* | |
63 | * clear_flush_young is called after the VM is | |
64 | * test-and-clearing the young/accessed bitflag in the | |
65 | * pte. This way the VM will provide proper aging to the | |
66 | * accesses to the page through the secondary MMUs and not | |
67 | * only to the ones through the Linux pte. | |
57128468 ALC |
68 | * Start-end is necessary in case the secondary MMU is mapping the page |
69 | * at a smaller granularity than the primary MMU. | |
cddb8a5c AA |
70 | */ |
71 | int (*clear_flush_young)(struct mmu_notifier *mn, | |
72 | struct mm_struct *mm, | |
57128468 ALC |
73 | unsigned long start, |
74 | unsigned long end); | |
cddb8a5c | 75 | |
1d7715c6 VD |
76 | /* |
77 | * clear_young is a lightweight version of clear_flush_young. Like the | |
78 | * latter, it is supposed to test-and-clear the young/accessed bitflag | |
79 | * in the secondary pte, but it may omit flushing the secondary tlb. | |
80 | */ | |
81 | int (*clear_young)(struct mmu_notifier *mn, | |
82 | struct mm_struct *mm, | |
83 | unsigned long start, | |
84 | unsigned long end); | |
85 | ||
8ee53820 AA |
86 | /* |
87 | * test_young is called to check the young/accessed bitflag in | |
88 | * the secondary pte. This is used to know if the page is | |
89 | * frequently used without actually clearing the flag or tearing | |
90 | * down the secondary mapping on the page. | |
91 | */ | |
92 | int (*test_young)(struct mmu_notifier *mn, | |
93 | struct mm_struct *mm, | |
94 | unsigned long address); | |
95 | ||
828502d3 IE |
96 | /* |
97 | * change_pte is called in cases that pte mapping to page is changed: | |
98 | * for example, when ksm remaps pte to point to a new shared page. | |
99 | */ | |
100 | void (*change_pte)(struct mmu_notifier *mn, | |
101 | struct mm_struct *mm, | |
102 | unsigned long address, | |
103 | pte_t pte); | |
104 | ||
cddb8a5c AA |
105 | /* |
106 | * invalidate_range_start() and invalidate_range_end() must be | |
107 | * paired and are called only when the mmap_sem and/or the | |
0f0a327f JR |
108 | * locks protecting the reverse maps are held. If the subsystem |
109 | * can't guarantee that no additional references are taken to | |
110 | * the pages in the range, it has to implement the | |
111 | * invalidate_range() notifier to remove any references taken | |
112 | * after invalidate_range_start(). | |
cddb8a5c AA |
113 | * |
114 | * Invalidation of multiple concurrent ranges may be | |
115 | * optionally permitted by the driver. Either way the | |
116 | * establishment of sptes is forbidden in the range passed to | |
117 | * invalidate_range_begin/end for the whole duration of the | |
118 | * invalidate_range_begin/end critical section. | |
119 | * | |
120 | * invalidate_range_start() is called when all pages in the | |
121 | * range are still mapped and have at least a refcount of one. | |
122 | * | |
123 | * invalidate_range_end() is called when all pages in the | |
124 | * range have been unmapped and the pages have been freed by | |
125 | * the VM. | |
126 | * | |
127 | * The VM will remove the page table entries and potentially | |
128 | * the page between invalidate_range_start() and | |
129 | * invalidate_range_end(). If the page must not be freed | |
130 | * because of pending I/O or other circumstances then the | |
131 | * invalidate_range_start() callback (or the initial mapping | |
132 | * by the driver) must make sure that the refcount is kept | |
133 | * elevated. | |
134 | * | |
135 | * If the driver increases the refcount when the pages are | |
136 | * initially mapped into an address space then either | |
137 | * invalidate_range_start() or invalidate_range_end() may | |
138 | * decrease the refcount. If the refcount is decreased on | |
139 | * invalidate_range_start() then the VM can free pages as page | |
140 | * table entries are removed. If the refcount is only | |
141 | * droppped on invalidate_range_end() then the driver itself | |
142 | * will drop the last refcount but it must take care to flush | |
143 | * any secondary tlb before doing the final free on the | |
144 | * page. Pages will no longer be referenced by the linux | |
145 | * address space but may still be referenced by sptes until | |
146 | * the last refcount is dropped. | |
5ff7091f | 147 | * |
93065ac7 MH |
148 | * If blockable argument is set to false then the callback cannot |
149 | * sleep and has to return with -EAGAIN. 0 should be returned | |
33490af3 MH |
150 | * otherwise. Please note that if invalidate_range_start approves |
151 | * a non-blocking behavior then the same applies to | |
152 | * invalidate_range_end. | |
93065ac7 | 153 | * |
cddb8a5c | 154 | */ |
93065ac7 | 155 | int (*invalidate_range_start)(struct mmu_notifier *mn, |
5d6527a7 | 156 | const struct mmu_notifier_range *range); |
cddb8a5c | 157 | void (*invalidate_range_end)(struct mmu_notifier *mn, |
5d6527a7 | 158 | const struct mmu_notifier_range *range); |
0f0a327f JR |
159 | |
160 | /* | |
161 | * invalidate_range() is either called between | |
162 | * invalidate_range_start() and invalidate_range_end() when the | |
163 | * VM has to free pages that where unmapped, but before the | |
164 | * pages are actually freed, or outside of _start()/_end() when | |
165 | * a (remote) TLB is necessary. | |
166 | * | |
167 | * If invalidate_range() is used to manage a non-CPU TLB with | |
168 | * shared page-tables, it not necessary to implement the | |
169 | * invalidate_range_start()/end() notifiers, as | |
170 | * invalidate_range() alread catches the points in time when an | |
0f10851e | 171 | * external TLB range needs to be flushed. For more in depth |
ad56b738 | 172 | * discussion on this see Documentation/vm/mmu_notifier.rst |
0f0a327f | 173 | * |
0f0a327f JR |
174 | * Note that this function might be called with just a sub-range |
175 | * of what was passed to invalidate_range_start()/end(), if | |
176 | * called between those functions. | |
177 | */ | |
178 | void (*invalidate_range)(struct mmu_notifier *mn, struct mm_struct *mm, | |
179 | unsigned long start, unsigned long end); | |
cddb8a5c AA |
180 | }; |
181 | ||
182 | /* | |
183 | * The notifier chains are protected by mmap_sem and/or the reverse map | |
184 | * semaphores. Notifier chains are only changed when all reverse maps and | |
185 | * the mmap_sem locks are taken. | |
186 | * | |
187 | * Therefore notifier chains can only be traversed when either | |
188 | * | |
189 | * 1. mmap_sem is held. | |
c8c06efa | 190 | * 2. One of the reverse map locks is held (i_mmap_rwsem or anon_vma->rwsem). |
cddb8a5c AA |
191 | * 3. No other concurrent thread can access the list (release) |
192 | */ | |
193 | struct mmu_notifier { | |
194 | struct hlist_node hlist; | |
195 | const struct mmu_notifier_ops *ops; | |
196 | }; | |
197 | ||
198 | static inline int mm_has_notifiers(struct mm_struct *mm) | |
199 | { | |
200 | return unlikely(mm->mmu_notifier_mm); | |
201 | } | |
202 | ||
203 | extern int mmu_notifier_register(struct mmu_notifier *mn, | |
204 | struct mm_struct *mm); | |
205 | extern int __mmu_notifier_register(struct mmu_notifier *mn, | |
206 | struct mm_struct *mm); | |
207 | extern void mmu_notifier_unregister(struct mmu_notifier *mn, | |
208 | struct mm_struct *mm); | |
b972216e PZ |
209 | extern void mmu_notifier_unregister_no_release(struct mmu_notifier *mn, |
210 | struct mm_struct *mm); | |
cddb8a5c AA |
211 | extern void __mmu_notifier_mm_destroy(struct mm_struct *mm); |
212 | extern void __mmu_notifier_release(struct mm_struct *mm); | |
213 | extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm, | |
57128468 ALC |
214 | unsigned long start, |
215 | unsigned long end); | |
1d7715c6 VD |
216 | extern int __mmu_notifier_clear_young(struct mm_struct *mm, |
217 | unsigned long start, | |
218 | unsigned long end); | |
8ee53820 AA |
219 | extern int __mmu_notifier_test_young(struct mm_struct *mm, |
220 | unsigned long address); | |
828502d3 IE |
221 | extern void __mmu_notifier_change_pte(struct mm_struct *mm, |
222 | unsigned long address, pte_t pte); | |
ac46d4f3 JG |
223 | extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r); |
224 | extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r, | |
4645b9fe | 225 | bool only_end); |
0f0a327f JR |
226 | extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, |
227 | unsigned long start, unsigned long end); | |
cddb8a5c AA |
228 | |
229 | static inline void mmu_notifier_release(struct mm_struct *mm) | |
230 | { | |
231 | if (mm_has_notifiers(mm)) | |
232 | __mmu_notifier_release(mm); | |
233 | } | |
234 | ||
235 | static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm, | |
57128468 ALC |
236 | unsigned long start, |
237 | unsigned long end) | |
cddb8a5c AA |
238 | { |
239 | if (mm_has_notifiers(mm)) | |
57128468 | 240 | return __mmu_notifier_clear_flush_young(mm, start, end); |
cddb8a5c AA |
241 | return 0; |
242 | } | |
243 | ||
1d7715c6 VD |
244 | static inline int mmu_notifier_clear_young(struct mm_struct *mm, |
245 | unsigned long start, | |
246 | unsigned long end) | |
247 | { | |
248 | if (mm_has_notifiers(mm)) | |
249 | return __mmu_notifier_clear_young(mm, start, end); | |
250 | return 0; | |
251 | } | |
252 | ||
8ee53820 AA |
253 | static inline int mmu_notifier_test_young(struct mm_struct *mm, |
254 | unsigned long address) | |
255 | { | |
256 | if (mm_has_notifiers(mm)) | |
257 | return __mmu_notifier_test_young(mm, address); | |
258 | return 0; | |
259 | } | |
260 | ||
828502d3 IE |
261 | static inline void mmu_notifier_change_pte(struct mm_struct *mm, |
262 | unsigned long address, pte_t pte) | |
263 | { | |
264 | if (mm_has_notifiers(mm)) | |
265 | __mmu_notifier_change_pte(mm, address, pte); | |
266 | } | |
267 | ||
ac46d4f3 JG |
268 | static inline void |
269 | mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) | |
cddb8a5c | 270 | { |
ac46d4f3 JG |
271 | if (mm_has_notifiers(range->mm)) { |
272 | range->blockable = true; | |
273 | __mmu_notifier_invalidate_range_start(range); | |
274 | } | |
93065ac7 MH |
275 | } |
276 | ||
ac46d4f3 JG |
277 | static inline int |
278 | mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) | |
93065ac7 | 279 | { |
ac46d4f3 JG |
280 | if (mm_has_notifiers(range->mm)) { |
281 | range->blockable = false; | |
282 | return __mmu_notifier_invalidate_range_start(range); | |
283 | } | |
93065ac7 | 284 | return 0; |
cddb8a5c AA |
285 | } |
286 | ||
ac46d4f3 JG |
287 | static inline void |
288 | mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) | |
cddb8a5c | 289 | { |
ac46d4f3 JG |
290 | if (mm_has_notifiers(range->mm)) |
291 | __mmu_notifier_invalidate_range_end(range, false); | |
4645b9fe JG |
292 | } |
293 | ||
ac46d4f3 JG |
294 | static inline void |
295 | mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) | |
4645b9fe | 296 | { |
ac46d4f3 JG |
297 | if (mm_has_notifiers(range->mm)) |
298 | __mmu_notifier_invalidate_range_end(range, true); | |
cddb8a5c AA |
299 | } |
300 | ||
1897bdc4 JR |
301 | static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, |
302 | unsigned long start, unsigned long end) | |
303 | { | |
0f0a327f JR |
304 | if (mm_has_notifiers(mm)) |
305 | __mmu_notifier_invalidate_range(mm, start, end); | |
1897bdc4 JR |
306 | } |
307 | ||
cddb8a5c AA |
308 | static inline void mmu_notifier_mm_init(struct mm_struct *mm) |
309 | { | |
310 | mm->mmu_notifier_mm = NULL; | |
311 | } | |
312 | ||
313 | static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) | |
314 | { | |
315 | if (mm_has_notifiers(mm)) | |
316 | __mmu_notifier_mm_destroy(mm); | |
317 | } | |
318 | ||
ac46d4f3 JG |
319 | |
320 | static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, | |
321 | struct mm_struct *mm, | |
322 | unsigned long start, | |
323 | unsigned long end) | |
324 | { | |
325 | range->mm = mm; | |
326 | range->start = start; | |
327 | range->end = end; | |
328 | } | |
329 | ||
cddb8a5c AA |
330 | #define ptep_clear_flush_young_notify(__vma, __address, __ptep) \ |
331 | ({ \ | |
332 | int __young; \ | |
333 | struct vm_area_struct *___vma = __vma; \ | |
334 | unsigned long ___address = __address; \ | |
335 | __young = ptep_clear_flush_young(___vma, ___address, __ptep); \ | |
336 | __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ | |
57128468 ALC |
337 | ___address, \ |
338 | ___address + \ | |
339 | PAGE_SIZE); \ | |
cddb8a5c AA |
340 | __young; \ |
341 | }) | |
342 | ||
91a4ee26 AA |
343 | #define pmdp_clear_flush_young_notify(__vma, __address, __pmdp) \ |
344 | ({ \ | |
345 | int __young; \ | |
346 | struct vm_area_struct *___vma = __vma; \ | |
347 | unsigned long ___address = __address; \ | |
348 | __young = pmdp_clear_flush_young(___vma, ___address, __pmdp); \ | |
349 | __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ | |
57128468 ALC |
350 | ___address, \ |
351 | ___address + \ | |
352 | PMD_SIZE); \ | |
91a4ee26 AA |
353 | __young; \ |
354 | }) | |
355 | ||
1d7715c6 VD |
356 | #define ptep_clear_young_notify(__vma, __address, __ptep) \ |
357 | ({ \ | |
358 | int __young; \ | |
359 | struct vm_area_struct *___vma = __vma; \ | |
360 | unsigned long ___address = __address; \ | |
361 | __young = ptep_test_and_clear_young(___vma, ___address, __ptep);\ | |
362 | __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ | |
363 | ___address + PAGE_SIZE); \ | |
364 | __young; \ | |
365 | }) | |
366 | ||
367 | #define pmdp_clear_young_notify(__vma, __address, __pmdp) \ | |
368 | ({ \ | |
369 | int __young; \ | |
370 | struct vm_area_struct *___vma = __vma; \ | |
371 | unsigned long ___address = __address; \ | |
372 | __young = pmdp_test_and_clear_young(___vma, ___address, __pmdp);\ | |
373 | __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ | |
374 | ___address + PMD_SIZE); \ | |
375 | __young; \ | |
376 | }) | |
377 | ||
34ee645e JR |
378 | #define ptep_clear_flush_notify(__vma, __address, __ptep) \ |
379 | ({ \ | |
380 | unsigned long ___addr = __address & PAGE_MASK; \ | |
381 | struct mm_struct *___mm = (__vma)->vm_mm; \ | |
382 | pte_t ___pte; \ | |
383 | \ | |
384 | ___pte = ptep_clear_flush(__vma, __address, __ptep); \ | |
385 | mmu_notifier_invalidate_range(___mm, ___addr, \ | |
386 | ___addr + PAGE_SIZE); \ | |
387 | \ | |
388 | ___pte; \ | |
389 | }) | |
390 | ||
8809aa2d | 391 | #define pmdp_huge_clear_flush_notify(__vma, __haddr, __pmd) \ |
34ee645e JR |
392 | ({ \ |
393 | unsigned long ___haddr = __haddr & HPAGE_PMD_MASK; \ | |
394 | struct mm_struct *___mm = (__vma)->vm_mm; \ | |
395 | pmd_t ___pmd; \ | |
396 | \ | |
8809aa2d | 397 | ___pmd = pmdp_huge_clear_flush(__vma, __haddr, __pmd); \ |
34ee645e JR |
398 | mmu_notifier_invalidate_range(___mm, ___haddr, \ |
399 | ___haddr + HPAGE_PMD_SIZE); \ | |
400 | \ | |
401 | ___pmd; \ | |
402 | }) | |
403 | ||
a00cc7d9 MW |
404 | #define pudp_huge_clear_flush_notify(__vma, __haddr, __pud) \ |
405 | ({ \ | |
406 | unsigned long ___haddr = __haddr & HPAGE_PUD_MASK; \ | |
407 | struct mm_struct *___mm = (__vma)->vm_mm; \ | |
408 | pud_t ___pud; \ | |
409 | \ | |
410 | ___pud = pudp_huge_clear_flush(__vma, __haddr, __pud); \ | |
411 | mmu_notifier_invalidate_range(___mm, ___haddr, \ | |
412 | ___haddr + HPAGE_PUD_SIZE); \ | |
413 | \ | |
414 | ___pud; \ | |
415 | }) | |
416 | ||
48af0d7c XG |
417 | /* |
418 | * set_pte_at_notify() sets the pte _after_ running the notifier. | |
419 | * This is safe to start by updating the secondary MMUs, because the primary MMU | |
420 | * pte invalidate must have already happened with a ptep_clear_flush() before | |
421 | * set_pte_at_notify() has been invoked. Updating the secondary MMUs first is | |
422 | * required when we change both the protection of the mapping from read-only to | |
423 | * read-write and the pfn (like during copy on write page faults). Otherwise the | |
424 | * old page would remain mapped readonly in the secondary MMUs after the new | |
425 | * page is already writable by some CPU through the primary MMU. | |
426 | */ | |
828502d3 IE |
427 | #define set_pte_at_notify(__mm, __address, __ptep, __pte) \ |
428 | ({ \ | |
429 | struct mm_struct *___mm = __mm; \ | |
430 | unsigned long ___address = __address; \ | |
431 | pte_t ___pte = __pte; \ | |
432 | \ | |
828502d3 | 433 | mmu_notifier_change_pte(___mm, ___address, ___pte); \ |
48af0d7c | 434 | set_pte_at(___mm, ___address, __ptep, ___pte); \ |
828502d3 IE |
435 | }) |
436 | ||
b972216e PZ |
437 | extern void mmu_notifier_call_srcu(struct rcu_head *rcu, |
438 | void (*func)(struct rcu_head *rcu)); | |
b972216e | 439 | |
cddb8a5c AA |
440 | #else /* CONFIG_MMU_NOTIFIER */ |
441 | ||
ac46d4f3 JG |
442 | struct mmu_notifier_range { |
443 | unsigned long start; | |
444 | unsigned long end; | |
445 | }; | |
446 | ||
447 | static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range, | |
448 | unsigned long start, | |
449 | unsigned long end) | |
450 | { | |
451 | range->start = start; | |
452 | range->end = end; | |
453 | } | |
454 | ||
455 | #define mmu_notifier_range_init(range, mm, start, end) \ | |
456 | _mmu_notifier_range_init(range, start, end) | |
457 | ||
458 | ||
4d4bbd85 MH |
459 | static inline int mm_has_notifiers(struct mm_struct *mm) |
460 | { | |
461 | return 0; | |
462 | } | |
463 | ||
cddb8a5c AA |
464 | static inline void mmu_notifier_release(struct mm_struct *mm) |
465 | { | |
466 | } | |
467 | ||
468 | static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm, | |
57128468 ALC |
469 | unsigned long start, |
470 | unsigned long end) | |
8ee53820 AA |
471 | { |
472 | return 0; | |
473 | } | |
474 | ||
475 | static inline int mmu_notifier_test_young(struct mm_struct *mm, | |
476 | unsigned long address) | |
cddb8a5c AA |
477 | { |
478 | return 0; | |
479 | } | |
480 | ||
828502d3 IE |
481 | static inline void mmu_notifier_change_pte(struct mm_struct *mm, |
482 | unsigned long address, pte_t pte) | |
483 | { | |
484 | } | |
485 | ||
ac46d4f3 JG |
486 | static inline void |
487 | mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) | |
cddb8a5c AA |
488 | { |
489 | } | |
490 | ||
ac46d4f3 JG |
491 | static inline int |
492 | mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) | |
93065ac7 MH |
493 | { |
494 | return 0; | |
495 | } | |
496 | ||
ac46d4f3 JG |
497 | static inline |
498 | void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) | |
cddb8a5c AA |
499 | { |
500 | } | |
501 | ||
ac46d4f3 JG |
502 | static inline void |
503 | mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) | |
4645b9fe JG |
504 | { |
505 | } | |
506 | ||
1897bdc4 JR |
507 | static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, |
508 | unsigned long start, unsigned long end) | |
509 | { | |
510 | } | |
511 | ||
cddb8a5c AA |
512 | static inline void mmu_notifier_mm_init(struct mm_struct *mm) |
513 | { | |
514 | } | |
515 | ||
516 | static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) | |
517 | { | |
518 | } | |
519 | ||
520 | #define ptep_clear_flush_young_notify ptep_clear_flush_young | |
91a4ee26 | 521 | #define pmdp_clear_flush_young_notify pmdp_clear_flush_young |
33c3fc71 VD |
522 | #define ptep_clear_young_notify ptep_test_and_clear_young |
523 | #define pmdp_clear_young_notify pmdp_test_and_clear_young | |
34ee645e | 524 | #define ptep_clear_flush_notify ptep_clear_flush |
8809aa2d | 525 | #define pmdp_huge_clear_flush_notify pmdp_huge_clear_flush |
a00cc7d9 | 526 | #define pudp_huge_clear_flush_notify pudp_huge_clear_flush |
828502d3 | 527 | #define set_pte_at_notify set_pte_at |
cddb8a5c AA |
528 | |
529 | #endif /* CONFIG_MMU_NOTIFIER */ | |
530 | ||
531 | #endif /* _LINUX_MMU_NOTIFIER_H */ |