Commit | Line | Data |
---|---|---|
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, | |
8f34f1ea | 13 | struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); |
5db4f15c | 14 | void huge_pmd_set_accessed(struct vm_fault *vmf); |
ebfe1b8f RC |
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 | ||
5db4f15c | 27 | vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf); |
ebfe1b8f RC |
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 | ||
e6be37b2 ML |
118 | static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, |
119 | unsigned long haddr) | |
120 | { | |
121 | /* Don't have to check pgoff for anonymous vma */ | |
122 | if (!vma_is_anonymous(vma)) { | |
123 | if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff, | |
124 | HPAGE_PMD_NR)) | |
125 | return false; | |
126 | } | |
127 | ||
128 | if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end) | |
129 | return false; | |
130 | return true; | |
131 | } | |
132 | ||
133 | static inline bool transhuge_vma_enabled(struct vm_area_struct *vma, | |
134 | unsigned long vm_flags) | |
135 | { | |
136 | /* Explicitly disabled through madvise. */ | |
137 | if ((vm_flags & VM_NOHUGEPAGE) || | |
138 | test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) | |
139 | return false; | |
140 | return true; | |
141 | } | |
142 | ||
7635d9cb MH |
143 | /* |
144 | * to be used on vmas which are known to support THP. | |
e6be37b2 | 145 | * Use transparent_hugepage_active otherwise |
7635d9cb MH |
146 | */ |
147 | static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) | |
16981d76 | 148 | { |
bae84953 AK |
149 | |
150 | /* | |
151 | * If the hardware/firmware marked hugepage support disabled. | |
152 | */ | |
153 | if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX)) | |
154 | return false; | |
155 | ||
e6be37b2 | 156 | if (!transhuge_vma_enabled(vma, vma->vm_flags)) |
16981d76 DW |
157 | return false; |
158 | ||
222100ee | 159 | if (vma_is_temporary_stack(vma)) |
16981d76 DW |
160 | return false; |
161 | ||
16981d76 DW |
162 | if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG)) |
163 | return true; | |
bae84953 | 164 | |
baabda26 DW |
165 | if (vma_is_dax(vma)) |
166 | return true; | |
167 | ||
16981d76 DW |
168 | if (transparent_hugepage_flags & |
169 | (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) | |
170 | return !!(vma->vm_flags & VM_HUGEPAGE); | |
171 | ||
172 | return false; | |
173 | } | |
174 | ||
e6be37b2 | 175 | bool transparent_hugepage_active(struct vm_area_struct *vma); |
43675e6f | 176 | |
79da5407 KS |
177 | #define transparent_hugepage_use_zero_page() \ |
178 | (transparent_hugepage_flags & \ | |
179 | (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) | |
71e3aac0 | 180 | |
ebfe1b8f RC |
181 | unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, |
182 | unsigned long len, unsigned long pgoff, unsigned long flags); | |
74d2fad1 | 183 | |
ebfe1b8f RC |
184 | void prep_transhuge_page(struct page *page); |
185 | void free_transhuge_page(struct page *page); | |
9a982250 | 186 | |
d4b4084a | 187 | bool can_split_folio(struct folio *folio, int *pextra_pins); |
e9b61f19 KS |
188 | int split_huge_page_to_list(struct page *page, struct list_head *list); |
189 | static inline int split_huge_page(struct page *page) | |
190 | { | |
191 | return split_huge_page_to_list(page, NULL); | |
192 | } | |
9a982250 | 193 | void deferred_split_huge_page(struct page *page); |
eef1b3ba KS |
194 | |
195 | void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, | |
af28a988 | 196 | unsigned long address, bool freeze, struct folio *folio); |
eef1b3ba KS |
197 | |
198 | #define split_huge_pmd(__vma, __pmd, __address) \ | |
199 | do { \ | |
200 | pmd_t *____pmd = (__pmd); \ | |
84c3fc4e | 201 | if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ |
5c7fb56e | 202 | || pmd_devmap(*____pmd)) \ |
fec89c10 | 203 | __split_huge_pmd(__vma, __pmd, __address, \ |
33f4751e | 204 | false, NULL); \ |
eef1b3ba | 205 | } while (0) |
ad0bed24 | 206 | |
2a52bcbc | 207 | |
fec89c10 | 208 | void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, |
af28a988 | 209 | bool freeze, struct folio *folio); |
2a52bcbc | 210 | |
a00cc7d9 MW |
211 | void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, |
212 | unsigned long address); | |
213 | ||
214 | #define split_huge_pud(__vma, __pud, __address) \ | |
215 | do { \ | |
216 | pud_t *____pud = (__pud); \ | |
217 | if (pud_trans_huge(*____pud) \ | |
218 | || pud_devmap(*____pud)) \ | |
219 | __split_huge_pud(__vma, __pud, __address); \ | |
220 | } while (0) | |
221 | ||
ebfe1b8f RC |
222 | int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, |
223 | int advice); | |
224 | void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, | |
225 | unsigned long end, long adjust_next); | |
226 | spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma); | |
227 | spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma); | |
84c3fc4e ZY |
228 | |
229 | static inline int is_swap_pmd(pmd_t pmd) | |
230 | { | |
231 | return !pmd_none(pmd) && !pmd_present(pmd); | |
232 | } | |
233 | ||
c1e8d7c6 | 234 | /* mmap_lock must be held on entry */ |
b6ec57f4 KS |
235 | static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
236 | struct vm_area_struct *vma) | |
025c5b24 | 237 | { |
84c3fc4e | 238 | if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) |
b6ec57f4 | 239 | return __pmd_trans_huge_lock(pmd, vma); |
025c5b24 | 240 | else |
969e8d7e | 241 | return NULL; |
025c5b24 | 242 | } |
a00cc7d9 MW |
243 | static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, |
244 | struct vm_area_struct *vma) | |
245 | { | |
a00cc7d9 MW |
246 | if (pud_trans_huge(*pud) || pud_devmap(*pud)) |
247 | return __pud_trans_huge_lock(pud, vma); | |
248 | else | |
249 | return NULL; | |
250 | } | |
6ffbb458 | 251 | |
5bf34d7c MWO |
252 | /** |
253 | * folio_test_pmd_mappable - Can we map this folio with a PMD? | |
254 | * @folio: The folio to test | |
255 | */ | |
256 | static inline bool folio_test_pmd_mappable(struct folio *folio) | |
257 | { | |
258 | return folio_order(folio) >= HPAGE_PMD_ORDER; | |
259 | } | |
260 | ||
a00cc7d9 | 261 | struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, |
df06b37f | 262 | pmd_t *pmd, int flags, struct dev_pagemap **pgmap); |
a00cc7d9 | 263 | struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, |
df06b37f | 264 | pud_t *pud, int flags, struct dev_pagemap **pgmap); |
a00cc7d9 | 265 | |
5db4f15c | 266 | vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf); |
d10e63f2 | 267 | |
56873f43 | 268 | extern struct page *huge_zero_page; |
3b77e8c8 | 269 | extern unsigned long huge_zero_pfn; |
56873f43 WY |
270 | |
271 | static inline bool is_huge_zero_page(struct page *page) | |
272 | { | |
6aa7de05 | 273 | return READ_ONCE(huge_zero_page) == page; |
56873f43 WY |
274 | } |
275 | ||
fc437044 MW |
276 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
277 | { | |
3b77e8c8 | 278 | return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd); |
fc437044 MW |
279 | } |
280 | ||
a00cc7d9 MW |
281 | static inline bool is_huge_zero_pud(pud_t pud) |
282 | { | |
283 | return false; | |
284 | } | |
285 | ||
6fcb52a5 AL |
286 | struct page *mm_get_huge_zero_page(struct mm_struct *mm); |
287 | void mm_put_huge_zero_page(struct mm_struct *mm); | |
fc437044 | 288 | |
10102459 KS |
289 | #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) |
290 | ||
9c670ea3 NH |
291 | static inline bool thp_migration_supported(void) |
292 | { | |
293 | return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); | |
294 | } | |
295 | ||
87eaceb3 YS |
296 | static inline struct list_head *page_deferred_list(struct page *page) |
297 | { | |
298 | /* | |
299 | * Global or memcg deferred list in the second tail pages is | |
300 | * occupied by compound_head. | |
301 | */ | |
302 | return &page[2].deferred_list; | |
303 | } | |
304 | ||
71e3aac0 | 305 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
d8c37c48 NH |
306 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
307 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) | |
308 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) | |
71e3aac0 | 309 | |
a00cc7d9 MW |
310 | #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) |
311 | #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) | |
312 | #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) | |
313 | ||
5bf34d7c MWO |
314 | static inline bool folio_test_pmd_mappable(struct folio *folio) |
315 | { | |
316 | return false; | |
317 | } | |
318 | ||
7635d9cb MH |
319 | static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) |
320 | { | |
321 | return false; | |
322 | } | |
323 | ||
e6be37b2 | 324 | static inline bool transparent_hugepage_active(struct vm_area_struct *vma) |
16981d76 DW |
325 | { |
326 | return false; | |
327 | } | |
71e3aac0 | 328 | |
43675e6f YS |
329 | static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, |
330 | unsigned long haddr) | |
331 | { | |
332 | return false; | |
333 | } | |
334 | ||
e6be37b2 ML |
335 | static inline bool transhuge_vma_enabled(struct vm_area_struct *vma, |
336 | unsigned long vm_flags) | |
337 | { | |
338 | return false; | |
339 | } | |
340 | ||
800d8c63 KS |
341 | static inline void prep_transhuge_page(struct page *page) {} |
342 | ||
71e3aac0 | 343 | #define transparent_hugepage_flags 0UL |
74d2fad1 TK |
344 | |
345 | #define thp_get_unmapped_area NULL | |
346 | ||
b8f593cd | 347 | static inline bool |
d4b4084a | 348 | can_split_folio(struct folio *folio, int *pextra_pins) |
b8f593cd HY |
349 | { |
350 | BUILD_BUG(); | |
351 | return false; | |
352 | } | |
5bc7b8ac SL |
353 | static inline int |
354 | split_huge_page_to_list(struct page *page, struct list_head *list) | |
355 | { | |
356 | return 0; | |
357 | } | |
71e3aac0 AA |
358 | static inline int split_huge_page(struct page *page) |
359 | { | |
360 | return 0; | |
361 | } | |
9a982250 | 362 | static inline void deferred_split_huge_page(struct page *page) {} |
78ddc534 | 363 | #define split_huge_pmd(__vma, __pmd, __address) \ |
e180377f | 364 | do { } while (0) |
2a52bcbc | 365 | |
fd60775a | 366 | static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
af28a988 | 367 | unsigned long address, bool freeze, struct folio *folio) {} |
2a52bcbc | 368 | static inline void split_huge_pmd_address(struct vm_area_struct *vma, |
af28a988 | 369 | unsigned long address, bool freeze, struct folio *folio) {} |
2a52bcbc | 370 | |
a00cc7d9 MW |
371 | #define split_huge_pud(__vma, __pmd, __address) \ |
372 | do { } while (0) | |
373 | ||
60ab3244 AA |
374 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
375 | unsigned long *vm_flags, int advice) | |
0af4e98b AA |
376 | { |
377 | BUG(); | |
378 | return 0; | |
379 | } | |
94fcc585 AA |
380 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
381 | unsigned long start, | |
382 | unsigned long end, | |
383 | long adjust_next) | |
384 | { | |
385 | } | |
84c3fc4e ZY |
386 | static inline int is_swap_pmd(pmd_t pmd) |
387 | { | |
388 | return 0; | |
389 | } | |
b6ec57f4 KS |
390 | static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
391 | struct vm_area_struct *vma) | |
025c5b24 | 392 | { |
b6ec57f4 | 393 | return NULL; |
025c5b24 | 394 | } |
a00cc7d9 MW |
395 | static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, |
396 | struct vm_area_struct *vma) | |
397 | { | |
398 | return NULL; | |
399 | } | |
d10e63f2 | 400 | |
5db4f15c | 401 | static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) |
d10e63f2 | 402 | { |
4daae3b4 | 403 | return 0; |
d10e63f2 MG |
404 | } |
405 | ||
56873f43 WY |
406 | static inline bool is_huge_zero_page(struct page *page) |
407 | { | |
408 | return false; | |
409 | } | |
410 | ||
3b77e8c8 HD |
411 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
412 | { | |
413 | return false; | |
414 | } | |
415 | ||
a00cc7d9 MW |
416 | static inline bool is_huge_zero_pud(pud_t pud) |
417 | { | |
418 | return false; | |
419 | } | |
420 | ||
6fcb52a5 | 421 | static inline void mm_put_huge_zero_page(struct mm_struct *mm) |
aa88b68c | 422 | { |
6fcb52a5 | 423 | return; |
aa88b68c | 424 | } |
3565fce3 DW |
425 | |
426 | static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, | |
df06b37f | 427 | unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap) |
3565fce3 DW |
428 | { |
429 | return NULL; | |
430 | } | |
a00cc7d9 MW |
431 | |
432 | static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, | |
df06b37f | 433 | unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap) |
a00cc7d9 MW |
434 | { |
435 | return NULL; | |
436 | } | |
9c670ea3 NH |
437 | |
438 | static inline bool thp_migration_supported(void) | |
439 | { | |
440 | return false; | |
441 | } | |
71e3aac0 AA |
442 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
443 | ||
346cf613 MWO |
444 | static inline int split_folio_to_list(struct folio *folio, |
445 | struct list_head *list) | |
446 | { | |
447 | return split_huge_page_to_list(&folio->page, list); | |
448 | } | |
449 | ||
71e3aac0 | 450 | #endif /* _LINUX_HUGE_MM_H */ |