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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
71e3aac0 AA |
2 | #ifndef _LINUX_HUGE_MM_H |
3 | #define _LINUX_HUGE_MM_H | |
4 | ||
16981d76 | 5 | #include <linux/sched/coredump.h> |
226ab561 | 6 | #include <linux/mm_types.h> |
16981d76 | 7 | |
baabda26 DW |
8 | #include <linux/fs.h> /* only for vma_is_dax() */ |
9 | ||
ebfe1b8f RC |
10 | vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf); |
11 | int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, | |
12 | pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, | |
13 | struct vm_area_struct *vma); | |
14 | void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd); | |
15 | int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm, | |
16 | pud_t *dst_pud, pud_t *src_pud, unsigned long addr, | |
17 | struct vm_area_struct *vma); | |
a00cc7d9 MW |
18 | |
19 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
ebfe1b8f | 20 | void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud); |
a00cc7d9 MW |
21 | #else |
22 | static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud) | |
23 | { | |
24 | } | |
25 | #endif | |
26 | ||
ebfe1b8f RC |
27 | vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd); |
28 | struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, | |
29 | unsigned long addr, pmd_t *pmd, | |
30 | unsigned int flags); | |
31 | bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, | |
32 | pmd_t *pmd, unsigned long addr, unsigned long next); | |
33 | int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, | |
34 | unsigned long addr); | |
35 | int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud, | |
36 | unsigned long addr); | |
37 | bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, | |
38 | unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd); | |
39 | int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, | |
40 | pgprot_t newprot, unsigned long cp_flags); | |
9a9731b1 THV |
41 | vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn, |
42 | pgprot_t pgprot, bool write); | |
43 | ||
44 | /** | |
45 | * vmf_insert_pfn_pmd - insert a pmd size pfn | |
46 | * @vmf: Structure describing the fault | |
47 | * @pfn: pfn to insert | |
48 | * @pgprot: page protection to use | |
49 | * @write: whether it's a write fault | |
50 | * | |
51 | * Insert a pmd size pfn. See vmf_insert_pfn() for additional info. | |
52 | * | |
53 | * Return: vm_fault_t value. | |
54 | */ | |
55 | static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, | |
56 | bool write) | |
57 | { | |
58 | return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write); | |
59 | } | |
60 | vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn, | |
61 | pgprot_t pgprot, bool write); | |
62 | ||
63 | /** | |
64 | * vmf_insert_pfn_pud - insert a pud size pfn | |
65 | * @vmf: Structure describing the fault | |
66 | * @pfn: pfn to insert | |
67 | * @pgprot: page protection to use | |
68 | * @write: whether it's a write fault | |
69 | * | |
70 | * Insert a pud size pfn. See vmf_insert_pfn() for additional info. | |
71 | * | |
72 | * Return: vm_fault_t value. | |
73 | */ | |
74 | static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, | |
75 | bool write) | |
76 | { | |
77 | return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write); | |
78 | } | |
79 | ||
71e3aac0 | 80 | enum transparent_hugepage_flag { |
bae84953 | 81 | TRANSPARENT_HUGEPAGE_NEVER_DAX, |
71e3aac0 AA |
82 | TRANSPARENT_HUGEPAGE_FLAG, |
83 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, | |
444eb2a4 MG |
84 | TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, |
85 | TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, | |
21440d7e | 86 | TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, |
71e3aac0 | 87 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, |
ba76149f | 88 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
79da5407 | 89 | TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, |
71e3aac0 AA |
90 | }; |
91 | ||
b46e756f KS |
92 | struct kobject; |
93 | struct kobj_attribute; | |
94 | ||
ebfe1b8f RC |
95 | ssize_t single_hugepage_flag_store(struct kobject *kobj, |
96 | struct kobj_attribute *attr, | |
97 | const char *buf, size_t count, | |
98 | enum transparent_hugepage_flag flag); | |
99 | ssize_t single_hugepage_flag_show(struct kobject *kobj, | |
100 | struct kobj_attribute *attr, char *buf, | |
101 | enum transparent_hugepage_flag flag); | |
5a6e75f8 KS |
102 | extern struct kobj_attribute shmem_enabled_attr; |
103 | ||
d8c37c48 NH |
104 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
105 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) | |
106 | ||
71e3aac0 | 107 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
fde52796 AK |
108 | #define HPAGE_PMD_SHIFT PMD_SHIFT |
109 | #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) | |
110 | #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) | |
71e3aac0 | 111 | |
a00cc7d9 MW |
112 | #define HPAGE_PUD_SHIFT PUD_SHIFT |
113 | #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT) | |
114 | #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1)) | |
115 | ||
16981d76 DW |
116 | extern unsigned long transparent_hugepage_flags; |
117 | ||
7635d9cb MH |
118 | /* |
119 | * to be used on vmas which are known to support THP. | |
120 | * Use transparent_hugepage_enabled otherwise | |
121 | */ | |
122 | static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) | |
16981d76 | 123 | { |
bae84953 AK |
124 | |
125 | /* | |
126 | * If the hardware/firmware marked hugepage support disabled. | |
127 | */ | |
128 | if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX)) | |
129 | return false; | |
130 | ||
16981d76 DW |
131 | if (vma->vm_flags & VM_NOHUGEPAGE) |
132 | return false; | |
133 | ||
222100ee | 134 | if (vma_is_temporary_stack(vma)) |
16981d76 DW |
135 | return false; |
136 | ||
137 | if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) | |
138 | return false; | |
139 | ||
140 | if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG)) | |
141 | return true; | |
bae84953 | 142 | |
baabda26 DW |
143 | if (vma_is_dax(vma)) |
144 | return true; | |
145 | ||
16981d76 DW |
146 | if (transparent_hugepage_flags & |
147 | (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) | |
148 | return !!(vma->vm_flags & VM_HUGEPAGE); | |
149 | ||
150 | return false; | |
151 | } | |
152 | ||
7635d9cb MH |
153 | bool transparent_hugepage_enabled(struct vm_area_struct *vma); |
154 | ||
43675e6f YS |
155 | #define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1) |
156 | ||
157 | static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, | |
158 | unsigned long haddr) | |
159 | { | |
160 | /* Don't have to check pgoff for anonymous vma */ | |
161 | if (!vma_is_anonymous(vma)) { | |
162 | if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) != | |
163 | (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK)) | |
164 | return false; | |
165 | } | |
166 | ||
167 | if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end) | |
168 | return false; | |
169 | return true; | |
170 | } | |
171 | ||
79da5407 KS |
172 | #define transparent_hugepage_use_zero_page() \ |
173 | (transparent_hugepage_flags & \ | |
174 | (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) | |
71e3aac0 | 175 | |
ebfe1b8f RC |
176 | unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, |
177 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
74d2fad1 | 178 | |
ebfe1b8f RC |
179 | void prep_transhuge_page(struct page *page); |
180 | void free_transhuge_page(struct page *page); | |
005ba37c | 181 | bool is_transparent_hugepage(struct page *page); |
9a982250 | 182 | |
b8f593cd | 183 | bool can_split_huge_page(struct page *page, int *pextra_pins); |
e9b61f19 KS |
184 | int split_huge_page_to_list(struct page *page, struct list_head *list); |
185 | static inline int split_huge_page(struct page *page) | |
186 | { | |
187 | return split_huge_page_to_list(page, NULL); | |
188 | } | |
9a982250 | 189 | void deferred_split_huge_page(struct page *page); |
eef1b3ba KS |
190 | |
191 | void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, | |
33f4751e | 192 | unsigned long address, bool freeze, struct page *page); |
eef1b3ba KS |
193 | |
194 | #define split_huge_pmd(__vma, __pmd, __address) \ | |
195 | do { \ | |
196 | pmd_t *____pmd = (__pmd); \ | |
84c3fc4e | 197 | if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ |
5c7fb56e | 198 | || pmd_devmap(*____pmd)) \ |
fec89c10 | 199 | __split_huge_pmd(__vma, __pmd, __address, \ |
33f4751e | 200 | false, NULL); \ |
eef1b3ba | 201 | } while (0) |
ad0bed24 | 202 | |
2a52bcbc | 203 | |
fec89c10 KS |
204 | void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, |
205 | bool freeze, struct page *page); | |
2a52bcbc | 206 | |
a00cc7d9 MW |
207 | void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, |
208 | unsigned long address); | |
209 | ||
210 | #define split_huge_pud(__vma, __pud, __address) \ | |
211 | do { \ | |
212 | pud_t *____pud = (__pud); \ | |
213 | if (pud_trans_huge(*____pud) \ | |
214 | || pud_devmap(*____pud)) \ | |
215 | __split_huge_pud(__vma, __pud, __address); \ | |
216 | } while (0) | |
217 | ||
ebfe1b8f RC |
218 | int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, |
219 | int advice); | |
220 | void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, | |
221 | unsigned long end, long adjust_next); | |
222 | spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma); | |
223 | spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma); | |
84c3fc4e ZY |
224 | |
225 | static inline int is_swap_pmd(pmd_t pmd) | |
226 | { | |
227 | return !pmd_none(pmd) && !pmd_present(pmd); | |
228 | } | |
229 | ||
c1e8d7c6 | 230 | /* mmap_lock must be held on entry */ |
b6ec57f4 KS |
231 | static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
232 | struct vm_area_struct *vma) | |
025c5b24 | 233 | { |
84c3fc4e | 234 | if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) |
b6ec57f4 | 235 | return __pmd_trans_huge_lock(pmd, vma); |
025c5b24 | 236 | else |
969e8d7e | 237 | return NULL; |
025c5b24 | 238 | } |
a00cc7d9 MW |
239 | static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, |
240 | struct vm_area_struct *vma) | |
241 | { | |
a00cc7d9 MW |
242 | if (pud_trans_huge(*pud) || pud_devmap(*pud)) |
243 | return __pud_trans_huge_lock(pud, vma); | |
244 | else | |
245 | return NULL; | |
246 | } | |
6ffbb458 | 247 | |
2be1d718 MWO |
248 | /** |
249 | * thp_head - Head page of a transparent huge page. | |
250 | * @page: Any page (tail, head or regular) found in the page cache. | |
251 | */ | |
252 | static inline struct page *thp_head(struct page *page) | |
253 | { | |
254 | return compound_head(page); | |
255 | } | |
256 | ||
6ffbb458 MWO |
257 | /** |
258 | * thp_order - Order of a transparent huge page. | |
259 | * @page: Head page of a transparent huge page. | |
260 | */ | |
261 | static inline unsigned int thp_order(struct page *page) | |
262 | { | |
263 | VM_BUG_ON_PGFLAGS(PageTail(page), page); | |
264 | if (PageHead(page)) | |
265 | return HPAGE_PMD_ORDER; | |
266 | return 0; | |
267 | } | |
268 | ||
6c357848 MWO |
269 | /** |
270 | * thp_nr_pages - The number of regular pages in this huge page. | |
271 | * @page: The head page of a huge page. | |
272 | */ | |
273 | static inline int thp_nr_pages(struct page *page) | |
2c888cfb | 274 | { |
6c357848 MWO |
275 | VM_BUG_ON_PGFLAGS(PageTail(page), page); |
276 | if (PageHead(page)) | |
2c888cfb RR |
277 | return HPAGE_PMD_NR; |
278 | return 1; | |
279 | } | |
d10e63f2 | 280 | |
a00cc7d9 | 281 | struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, |
df06b37f | 282 | pmd_t *pmd, int flags, struct dev_pagemap **pgmap); |
a00cc7d9 | 283 | struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, |
df06b37f | 284 | pud_t *pud, int flags, struct dev_pagemap **pgmap); |
a00cc7d9 | 285 | |
ebfe1b8f | 286 | vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd); |
d10e63f2 | 287 | |
56873f43 WY |
288 | extern struct page *huge_zero_page; |
289 | ||
290 | static inline bool is_huge_zero_page(struct page *page) | |
291 | { | |
6aa7de05 | 292 | return READ_ONCE(huge_zero_page) == page; |
56873f43 WY |
293 | } |
294 | ||
fc437044 MW |
295 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
296 | { | |
297 | return is_huge_zero_page(pmd_page(pmd)); | |
298 | } | |
299 | ||
a00cc7d9 MW |
300 | static inline bool is_huge_zero_pud(pud_t pud) |
301 | { | |
302 | return false; | |
303 | } | |
304 | ||
6fcb52a5 AL |
305 | struct page *mm_get_huge_zero_page(struct mm_struct *mm); |
306 | void mm_put_huge_zero_page(struct mm_struct *mm); | |
fc437044 | 307 | |
10102459 KS |
308 | #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) |
309 | ||
9c670ea3 NH |
310 | static inline bool thp_migration_supported(void) |
311 | { | |
312 | return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); | |
313 | } | |
314 | ||
87eaceb3 YS |
315 | static inline struct list_head *page_deferred_list(struct page *page) |
316 | { | |
317 | /* | |
318 | * Global or memcg deferred list in the second tail pages is | |
319 | * occupied by compound_head. | |
320 | */ | |
321 | return &page[2].deferred_list; | |
322 | } | |
323 | ||
71e3aac0 | 324 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
325 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
326 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
327 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 328 | |
a00cc7d9 MW |
329 | #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) |
330 | #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) | |
331 | #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) | |
332 | ||
2be1d718 MWO |
333 | static inline struct page *thp_head(struct page *page) |
334 | { | |
335 | VM_BUG_ON_PGFLAGS(PageTail(page), page); | |
336 | return page; | |
337 | } | |
338 | ||
6ffbb458 MWO |
339 | static inline unsigned int thp_order(struct page *page) |
340 | { | |
341 | VM_BUG_ON_PGFLAGS(PageTail(page), page); | |
342 | return 0; | |
343 | } | |
344 | ||
6c357848 | 345 | static inline int thp_nr_pages(struct page *page) |
77d6b909 | 346 | { |
6c357848 | 347 | VM_BUG_ON_PGFLAGS(PageTail(page), page); |
77d6b909 MWO |
348 | return 1; |
349 | } | |
2c888cfb | 350 | |
7635d9cb MH |
351 | static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) |
352 | { | |
353 | return false; | |
354 | } | |
355 | ||
16981d76 DW |
356 | static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma) |
357 | { | |
358 | return false; | |
359 | } | |
71e3aac0 | 360 | |
43675e6f YS |
361 | static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, |
362 | unsigned long haddr) | |
363 | { | |
364 | return false; | |
365 | } | |
366 | ||
800d8c63 KS |
367 | static inline void prep_transhuge_page(struct page *page) {} |
368 | ||
005ba37c SC |
369 | static inline bool is_transparent_hugepage(struct page *page) |
370 | { | |
371 | return false; | |
372 | } | |
373 | ||
71e3aac0 | 374 | #define transparent_hugepage_flags 0UL |
74d2fad1 TK |
375 | |
376 | #define thp_get_unmapped_area NULL | |
377 | ||
b8f593cd HY |
378 | static inline bool |
379 | can_split_huge_page(struct page *page, int *pextra_pins) | |
380 | { | |
381 | BUILD_BUG(); | |
382 | return false; | |
383 | } | |
5bc7b8ac SL |
384 | static inline int |
385 | split_huge_page_to_list(struct page *page, struct list_head *list) | |
386 | { | |
387 | return 0; | |
388 | } | |
71e3aac0 AA |
389 | static inline int split_huge_page(struct page *page) |
390 | { | |
391 | return 0; | |
392 | } | |
9a982250 | 393 | static inline void deferred_split_huge_page(struct page *page) {} |
78ddc534 | 394 | #define split_huge_pmd(__vma, __pmd, __address) \ |
e180377f | 395 | do { } while (0) |
2a52bcbc | 396 | |
fd60775a DR |
397 | static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
398 | unsigned long address, bool freeze, struct page *page) {} | |
2a52bcbc | 399 | static inline void split_huge_pmd_address(struct vm_area_struct *vma, |
fec89c10 | 400 | unsigned long address, bool freeze, struct page *page) {} |
2a52bcbc | 401 | |
a00cc7d9 MW |
402 | #define split_huge_pud(__vma, __pmd, __address) \ |
403 | do { } while (0) | |
404 | ||
60ab3244 AA |
405 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
406 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
407 | { |
408 | BUG(); | |
409 | return 0; | |
410 | } | |
94fcc585 AA |
411 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
412 | unsigned long start, | |
413 | unsigned long end, | |
414 | long adjust_next) | |
415 | { | |
416 | } | |
84c3fc4e ZY |
417 | static inline int is_swap_pmd(pmd_t pmd) |
418 | { | |
419 | return 0; | |
420 | } | |
b6ec57f4 KS |
421 | static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
422 | struct vm_area_struct *vma) | |
025c5b24 | 423 | { |
b6ec57f4 | 424 | return NULL; |
025c5b24 | 425 | } |
a00cc7d9 MW |
426 | static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, |
427 | struct vm_area_struct *vma) | |
428 | { | |
429 | return NULL; | |
430 | } | |
d10e63f2 | 431 | |
2b740303 SJ |
432 | static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, |
433 | pmd_t orig_pmd) | |
d10e63f2 | 434 | { |
4daae3b4 | 435 | return 0; |
d10e63f2 MG |
436 | } |
437 | ||
56873f43 WY |
438 | static inline bool is_huge_zero_page(struct page *page) |
439 | { | |
440 | return false; | |
441 | } | |
442 | ||
a00cc7d9 MW |
443 | static inline bool is_huge_zero_pud(pud_t pud) |
444 | { | |
445 | return false; | |
446 | } | |
447 | ||
6fcb52a5 | 448 | static inline void mm_put_huge_zero_page(struct mm_struct *mm) |
aa88b68c | 449 | { |
6fcb52a5 | 450 | return; |
aa88b68c | 451 | } |
3565fce3 DW |
452 | |
453 | static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, | |
df06b37f | 454 | unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap) |
3565fce3 DW |
455 | { |
456 | return NULL; | |
457 | } | |
a00cc7d9 MW |
458 | |
459 | static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, | |
df06b37f | 460 | unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap) |
a00cc7d9 MW |
461 | { |
462 | return NULL; | |
463 | } | |
9c670ea3 NH |
464 | |
465 | static inline bool thp_migration_supported(void) | |
466 | { | |
467 | return false; | |
468 | } | |
71e3aac0 AA |
469 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
470 | ||
af3bbc12 MWO |
471 | /** |
472 | * thp_size - Size of a transparent huge page. | |
473 | * @page: Head page of a transparent huge page. | |
474 | * | |
475 | * Return: Number of bytes in this page. | |
476 | */ | |
477 | static inline unsigned long thp_size(struct page *page) | |
478 | { | |
479 | return PAGE_SIZE << thp_order(page); | |
480 | } | |
481 | ||
71e3aac0 | 482 | #endif /* _LINUX_HUGE_MM_H */ |