| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_HUGE_MM_H |
| 3 | #define _LINUX_HUGE_MM_H |
| 4 | |
| 5 | #include <linux/sched/coredump.h> |
| 6 | #include <linux/mm_types.h> |
| 7 | |
| 8 | #include <linux/fs.h> /* only for vma_is_dax() */ |
| 9 | |
| 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 *dst_vma, struct vm_area_struct *src_vma); |
| 14 | void huge_pmd_set_accessed(struct vm_fault *vmf); |
| 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); |
| 18 | |
| 19 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
| 20 | void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud); |
| 21 | #else |
| 22 | static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud) |
| 23 | { |
| 24 | } |
| 25 | #endif |
| 26 | |
| 27 | vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf); |
| 28 | bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, |
| 29 | pmd_t *pmd, unsigned long addr, unsigned long next); |
| 30 | int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, |
| 31 | unsigned long addr); |
| 32 | int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud, |
| 33 | unsigned long addr); |
| 34 | bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr, |
| 35 | unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd); |
| 36 | int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, |
| 37 | pmd_t *pmd, unsigned long addr, pgprot_t newprot, |
| 38 | unsigned long cp_flags); |
| 39 | |
| 40 | vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write); |
| 41 | vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write); |
| 42 | |
| 43 | enum transparent_hugepage_flag { |
| 44 | TRANSPARENT_HUGEPAGE_UNSUPPORTED, |
| 45 | TRANSPARENT_HUGEPAGE_FLAG, |
| 46 | TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, |
| 47 | TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, |
| 48 | TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, |
| 49 | TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, |
| 50 | TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG, |
| 51 | TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG, |
| 52 | TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG, |
| 53 | }; |
| 54 | |
| 55 | struct kobject; |
| 56 | struct kobj_attribute; |
| 57 | |
| 58 | ssize_t single_hugepage_flag_store(struct kobject *kobj, |
| 59 | struct kobj_attribute *attr, |
| 60 | const char *buf, size_t count, |
| 61 | enum transparent_hugepage_flag flag); |
| 62 | ssize_t single_hugepage_flag_show(struct kobject *kobj, |
| 63 | struct kobj_attribute *attr, char *buf, |
| 64 | enum transparent_hugepage_flag flag); |
| 65 | extern struct kobj_attribute shmem_enabled_attr; |
| 66 | |
| 67 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT) |
| 68 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER) |
| 69 | |
| 70 | /* |
| 71 | * Mask of all large folio orders supported for anonymous THP; all orders up to |
| 72 | * and including PMD_ORDER, except order-0 (which is not "huge") and order-1 |
| 73 | * (which is a limitation of the THP implementation). |
| 74 | */ |
| 75 | #define THP_ORDERS_ALL_ANON ((BIT(PMD_ORDER + 1) - 1) & ~(BIT(0) | BIT(1))) |
| 76 | |
| 77 | /* |
| 78 | * Mask of all large folio orders supported for file THP. |
| 79 | */ |
| 80 | #define THP_ORDERS_ALL_FILE (BIT(PMD_ORDER) | BIT(PUD_ORDER)) |
| 81 | |
| 82 | /* |
| 83 | * Mask of all large folio orders supported for THP. |
| 84 | */ |
| 85 | #define THP_ORDERS_ALL (THP_ORDERS_ALL_ANON | THP_ORDERS_ALL_FILE) |
| 86 | |
| 87 | #define thp_vma_allowable_order(vma, vm_flags, smaps, in_pf, enforce_sysfs, order) \ |
| 88 | (!!thp_vma_allowable_orders(vma, vm_flags, smaps, in_pf, enforce_sysfs, BIT(order))) |
| 89 | |
| 90 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 91 | #define HPAGE_PMD_SHIFT PMD_SHIFT |
| 92 | #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT) |
| 93 | #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1)) |
| 94 | |
| 95 | #define HPAGE_PUD_SHIFT PUD_SHIFT |
| 96 | #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT) |
| 97 | #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1)) |
| 98 | |
| 99 | extern unsigned long transparent_hugepage_flags; |
| 100 | extern unsigned long huge_anon_orders_always; |
| 101 | extern unsigned long huge_anon_orders_madvise; |
| 102 | extern unsigned long huge_anon_orders_inherit; |
| 103 | |
| 104 | static inline bool hugepage_global_enabled(void) |
| 105 | { |
| 106 | return transparent_hugepage_flags & |
| 107 | ((1<<TRANSPARENT_HUGEPAGE_FLAG) | |
| 108 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)); |
| 109 | } |
| 110 | |
| 111 | static inline bool hugepage_global_always(void) |
| 112 | { |
| 113 | return transparent_hugepage_flags & |
| 114 | (1<<TRANSPARENT_HUGEPAGE_FLAG); |
| 115 | } |
| 116 | |
| 117 | static inline bool hugepage_flags_enabled(void) |
| 118 | { |
| 119 | /* |
| 120 | * We cover both the anon and the file-backed case here; we must return |
| 121 | * true if globally enabled, even when all anon sizes are set to never. |
| 122 | * So we don't need to look at huge_anon_orders_inherit. |
| 123 | */ |
| 124 | return hugepage_global_enabled() || |
| 125 | huge_anon_orders_always || |
| 126 | huge_anon_orders_madvise; |
| 127 | } |
| 128 | |
| 129 | static inline int highest_order(unsigned long orders) |
| 130 | { |
| 131 | return fls_long(orders) - 1; |
| 132 | } |
| 133 | |
| 134 | static inline int next_order(unsigned long *orders, int prev) |
| 135 | { |
| 136 | *orders &= ~BIT(prev); |
| 137 | return highest_order(*orders); |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Do the below checks: |
| 142 | * - For file vma, check if the linear page offset of vma is |
| 143 | * order-aligned within the file. The hugepage is |
| 144 | * guaranteed to be order-aligned within the file, but we must |
| 145 | * check that the order-aligned addresses in the VMA map to |
| 146 | * order-aligned offsets within the file, else the hugepage will |
| 147 | * not be mappable. |
| 148 | * - For all vmas, check if the haddr is in an aligned hugepage |
| 149 | * area. |
| 150 | */ |
| 151 | static inline bool thp_vma_suitable_order(struct vm_area_struct *vma, |
| 152 | unsigned long addr, int order) |
| 153 | { |
| 154 | unsigned long hpage_size = PAGE_SIZE << order; |
| 155 | unsigned long haddr; |
| 156 | |
| 157 | /* Don't have to check pgoff for anonymous vma */ |
| 158 | if (!vma_is_anonymous(vma)) { |
| 159 | if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff, |
| 160 | hpage_size >> PAGE_SHIFT)) |
| 161 | return false; |
| 162 | } |
| 163 | |
| 164 | haddr = ALIGN_DOWN(addr, hpage_size); |
| 165 | |
| 166 | if (haddr < vma->vm_start || haddr + hpage_size > vma->vm_end) |
| 167 | return false; |
| 168 | return true; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Filter the bitfield of input orders to the ones suitable for use in the vma. |
| 173 | * See thp_vma_suitable_order(). |
| 174 | * All orders that pass the checks are returned as a bitfield. |
| 175 | */ |
| 176 | static inline unsigned long thp_vma_suitable_orders(struct vm_area_struct *vma, |
| 177 | unsigned long addr, unsigned long orders) |
| 178 | { |
| 179 | int order; |
| 180 | |
| 181 | /* |
| 182 | * Iterate over orders, highest to lowest, removing orders that don't |
| 183 | * meet alignment requirements from the set. Exit loop at first order |
| 184 | * that meets requirements, since all lower orders must also meet |
| 185 | * requirements. |
| 186 | */ |
| 187 | |
| 188 | order = highest_order(orders); |
| 189 | |
| 190 | while (orders) { |
| 191 | if (thp_vma_suitable_order(vma, addr, order)) |
| 192 | break; |
| 193 | order = next_order(&orders, order); |
| 194 | } |
| 195 | |
| 196 | return orders; |
| 197 | } |
| 198 | |
| 199 | static inline bool file_thp_enabled(struct vm_area_struct *vma) |
| 200 | { |
| 201 | struct inode *inode; |
| 202 | |
| 203 | if (!vma->vm_file) |
| 204 | return false; |
| 205 | |
| 206 | inode = vma->vm_file->f_inode; |
| 207 | |
| 208 | return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) && |
| 209 | !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode); |
| 210 | } |
| 211 | |
| 212 | unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma, |
| 213 | unsigned long vm_flags, bool smaps, |
| 214 | bool in_pf, bool enforce_sysfs, |
| 215 | unsigned long orders); |
| 216 | |
| 217 | /** |
| 218 | * thp_vma_allowable_orders - determine hugepage orders that are allowed for vma |
| 219 | * @vma: the vm area to check |
| 220 | * @vm_flags: use these vm_flags instead of vma->vm_flags |
| 221 | * @smaps: whether answer will be used for smaps file |
| 222 | * @in_pf: whether answer will be used by page fault handler |
| 223 | * @enforce_sysfs: whether sysfs config should be taken into account |
| 224 | * @orders: bitfield of all orders to consider |
| 225 | * |
| 226 | * Calculates the intersection of the requested hugepage orders and the allowed |
| 227 | * hugepage orders for the provided vma. Permitted orders are encoded as a set |
| 228 | * bit at the corresponding bit position (bit-2 corresponds to order-2, bit-3 |
| 229 | * corresponds to order-3, etc). Order-0 is never considered a hugepage order. |
| 230 | * |
| 231 | * Return: bitfield of orders allowed for hugepage in the vma. 0 if no hugepage |
| 232 | * orders are allowed. |
| 233 | */ |
| 234 | static inline |
| 235 | unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma, |
| 236 | unsigned long vm_flags, bool smaps, |
| 237 | bool in_pf, bool enforce_sysfs, |
| 238 | unsigned long orders) |
| 239 | { |
| 240 | /* Optimization to check if required orders are enabled early. */ |
| 241 | if (enforce_sysfs && vma_is_anonymous(vma)) { |
| 242 | unsigned long mask = READ_ONCE(huge_anon_orders_always); |
| 243 | |
| 244 | if (vm_flags & VM_HUGEPAGE) |
| 245 | mask |= READ_ONCE(huge_anon_orders_madvise); |
| 246 | if (hugepage_global_always() || |
| 247 | ((vm_flags & VM_HUGEPAGE) && hugepage_global_enabled())) |
| 248 | mask |= READ_ONCE(huge_anon_orders_inherit); |
| 249 | |
| 250 | orders &= mask; |
| 251 | if (!orders) |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | return __thp_vma_allowable_orders(vma, vm_flags, smaps, in_pf, |
| 256 | enforce_sysfs, orders); |
| 257 | } |
| 258 | |
| 259 | #define transparent_hugepage_use_zero_page() \ |
| 260 | (transparent_hugepage_flags & \ |
| 261 | (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG)) |
| 262 | |
| 263 | unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, |
| 264 | unsigned long len, unsigned long pgoff, unsigned long flags); |
| 265 | |
| 266 | void folio_prep_large_rmappable(struct folio *folio); |
| 267 | bool can_split_folio(struct folio *folio, int *pextra_pins); |
| 268 | int split_huge_page_to_list_to_order(struct page *page, struct list_head *list, |
| 269 | unsigned int new_order); |
| 270 | static inline int split_huge_page(struct page *page) |
| 271 | { |
| 272 | return split_huge_page_to_list_to_order(page, NULL, 0); |
| 273 | } |
| 274 | void deferred_split_folio(struct folio *folio); |
| 275 | |
| 276 | void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
| 277 | unsigned long address, bool freeze, struct folio *folio); |
| 278 | |
| 279 | #define split_huge_pmd(__vma, __pmd, __address) \ |
| 280 | do { \ |
| 281 | pmd_t *____pmd = (__pmd); \ |
| 282 | if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \ |
| 283 | || pmd_devmap(*____pmd)) \ |
| 284 | __split_huge_pmd(__vma, __pmd, __address, \ |
| 285 | false, NULL); \ |
| 286 | } while (0) |
| 287 | |
| 288 | |
| 289 | void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, |
| 290 | bool freeze, struct folio *folio); |
| 291 | |
| 292 | void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, |
| 293 | unsigned long address); |
| 294 | |
| 295 | #define split_huge_pud(__vma, __pud, __address) \ |
| 296 | do { \ |
| 297 | pud_t *____pud = (__pud); \ |
| 298 | if (pud_trans_huge(*____pud) \ |
| 299 | || pud_devmap(*____pud)) \ |
| 300 | __split_huge_pud(__vma, __pud, __address); \ |
| 301 | } while (0) |
| 302 | |
| 303 | int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, |
| 304 | int advice); |
| 305 | int madvise_collapse(struct vm_area_struct *vma, |
| 306 | struct vm_area_struct **prev, |
| 307 | unsigned long start, unsigned long end); |
| 308 | void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, |
| 309 | unsigned long end, long adjust_next); |
| 310 | spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma); |
| 311 | spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma); |
| 312 | |
| 313 | static inline int is_swap_pmd(pmd_t pmd) |
| 314 | { |
| 315 | return !pmd_none(pmd) && !pmd_present(pmd); |
| 316 | } |
| 317 | |
| 318 | /* mmap_lock must be held on entry */ |
| 319 | static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
| 320 | struct vm_area_struct *vma) |
| 321 | { |
| 322 | if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) |
| 323 | return __pmd_trans_huge_lock(pmd, vma); |
| 324 | else |
| 325 | return NULL; |
| 326 | } |
| 327 | static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, |
| 328 | struct vm_area_struct *vma) |
| 329 | { |
| 330 | if (pud_trans_huge(*pud) || pud_devmap(*pud)) |
| 331 | return __pud_trans_huge_lock(pud, vma); |
| 332 | else |
| 333 | return NULL; |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * folio_test_pmd_mappable - Can we map this folio with a PMD? |
| 338 | * @folio: The folio to test |
| 339 | */ |
| 340 | static inline bool folio_test_pmd_mappable(struct folio *folio) |
| 341 | { |
| 342 | return folio_order(folio) >= HPAGE_PMD_ORDER; |
| 343 | } |
| 344 | |
| 345 | struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, |
| 346 | pmd_t *pmd, int flags, struct dev_pagemap **pgmap); |
| 347 | struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, |
| 348 | pud_t *pud, int flags, struct dev_pagemap **pgmap); |
| 349 | |
| 350 | vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf); |
| 351 | |
| 352 | extern struct page *huge_zero_page; |
| 353 | extern unsigned long huge_zero_pfn; |
| 354 | |
| 355 | static inline bool is_huge_zero_page(struct page *page) |
| 356 | { |
| 357 | return READ_ONCE(huge_zero_page) == page; |
| 358 | } |
| 359 | |
| 360 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
| 361 | { |
| 362 | return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd); |
| 363 | } |
| 364 | |
| 365 | static inline bool is_huge_zero_pud(pud_t pud) |
| 366 | { |
| 367 | return false; |
| 368 | } |
| 369 | |
| 370 | struct page *mm_get_huge_zero_page(struct mm_struct *mm); |
| 371 | void mm_put_huge_zero_page(struct mm_struct *mm); |
| 372 | |
| 373 | #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot)) |
| 374 | |
| 375 | static inline bool thp_migration_supported(void) |
| 376 | { |
| 377 | return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION); |
| 378 | } |
| 379 | |
| 380 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| 381 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; }) |
| 382 | #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; }) |
| 383 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) |
| 384 | |
| 385 | #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; }) |
| 386 | #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) |
| 387 | #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; }) |
| 388 | |
| 389 | static inline bool folio_test_pmd_mappable(struct folio *folio) |
| 390 | { |
| 391 | return false; |
| 392 | } |
| 393 | |
| 394 | static inline bool thp_vma_suitable_order(struct vm_area_struct *vma, |
| 395 | unsigned long addr, int order) |
| 396 | { |
| 397 | return false; |
| 398 | } |
| 399 | |
| 400 | static inline unsigned long thp_vma_suitable_orders(struct vm_area_struct *vma, |
| 401 | unsigned long addr, unsigned long orders) |
| 402 | { |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | static inline unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma, |
| 407 | unsigned long vm_flags, bool smaps, |
| 408 | bool in_pf, bool enforce_sysfs, |
| 409 | unsigned long orders) |
| 410 | { |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static inline void folio_prep_large_rmappable(struct folio *folio) {} |
| 415 | |
| 416 | #define transparent_hugepage_flags 0UL |
| 417 | |
| 418 | #define thp_get_unmapped_area NULL |
| 419 | |
| 420 | static inline bool |
| 421 | can_split_folio(struct folio *folio, int *pextra_pins) |
| 422 | { |
| 423 | return false; |
| 424 | } |
| 425 | static inline int |
| 426 | split_huge_page_to_list_to_order(struct page *page, struct list_head *list, |
| 427 | unsigned int new_order) |
| 428 | { |
| 429 | return 0; |
| 430 | } |
| 431 | static inline int split_huge_page(struct page *page) |
| 432 | { |
| 433 | return 0; |
| 434 | } |
| 435 | static inline void deferred_split_folio(struct folio *folio) {} |
| 436 | #define split_huge_pmd(__vma, __pmd, __address) \ |
| 437 | do { } while (0) |
| 438 | |
| 439 | static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, |
| 440 | unsigned long address, bool freeze, struct folio *folio) {} |
| 441 | static inline void split_huge_pmd_address(struct vm_area_struct *vma, |
| 442 | unsigned long address, bool freeze, struct folio *folio) {} |
| 443 | |
| 444 | #define split_huge_pud(__vma, __pmd, __address) \ |
| 445 | do { } while (0) |
| 446 | |
| 447 | static inline int hugepage_madvise(struct vm_area_struct *vma, |
| 448 | unsigned long *vm_flags, int advice) |
| 449 | { |
| 450 | return -EINVAL; |
| 451 | } |
| 452 | |
| 453 | static inline int madvise_collapse(struct vm_area_struct *vma, |
| 454 | struct vm_area_struct **prev, |
| 455 | unsigned long start, unsigned long end) |
| 456 | { |
| 457 | return -EINVAL; |
| 458 | } |
| 459 | |
| 460 | static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, |
| 461 | unsigned long start, |
| 462 | unsigned long end, |
| 463 | long adjust_next) |
| 464 | { |
| 465 | } |
| 466 | static inline int is_swap_pmd(pmd_t pmd) |
| 467 | { |
| 468 | return 0; |
| 469 | } |
| 470 | static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd, |
| 471 | struct vm_area_struct *vma) |
| 472 | { |
| 473 | return NULL; |
| 474 | } |
| 475 | static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, |
| 476 | struct vm_area_struct *vma) |
| 477 | { |
| 478 | return NULL; |
| 479 | } |
| 480 | |
| 481 | static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) |
| 482 | { |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | static inline bool is_huge_zero_page(struct page *page) |
| 487 | { |
| 488 | return false; |
| 489 | } |
| 490 | |
| 491 | static inline bool is_huge_zero_pmd(pmd_t pmd) |
| 492 | { |
| 493 | return false; |
| 494 | } |
| 495 | |
| 496 | static inline bool is_huge_zero_pud(pud_t pud) |
| 497 | { |
| 498 | return false; |
| 499 | } |
| 500 | |
| 501 | static inline void mm_put_huge_zero_page(struct mm_struct *mm) |
| 502 | { |
| 503 | return; |
| 504 | } |
| 505 | |
| 506 | static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma, |
| 507 | unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap) |
| 508 | { |
| 509 | return NULL; |
| 510 | } |
| 511 | |
| 512 | static inline struct page *follow_devmap_pud(struct vm_area_struct *vma, |
| 513 | unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap) |
| 514 | { |
| 515 | return NULL; |
| 516 | } |
| 517 | |
| 518 | static inline bool thp_migration_supported(void) |
| 519 | { |
| 520 | return false; |
| 521 | } |
| 522 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| 523 | |
| 524 | static inline int split_folio_to_list_to_order(struct folio *folio, |
| 525 | struct list_head *list, int new_order) |
| 526 | { |
| 527 | return split_huge_page_to_list_to_order(&folio->page, list, new_order); |
| 528 | } |
| 529 | |
| 530 | static inline int split_folio_to_order(struct folio *folio, int new_order) |
| 531 | { |
| 532 | return split_folio_to_list_to_order(folio, NULL, new_order); |
| 533 | } |
| 534 | |
| 535 | #define split_folio_to_list(f, l) split_folio_to_list_to_order(f, l, 0) |
| 536 | #define split_folio(f) split_folio_to_order(f, 0) |
| 537 | |
| 538 | /* |
| 539 | * archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to |
| 540 | * limitations in the implementation like arm64 MTE can override this to |
| 541 | * false |
| 542 | */ |
| 543 | #ifndef arch_thp_swp_supported |
| 544 | static inline bool arch_thp_swp_supported(void) |
| 545 | { |
| 546 | return true; |
| 547 | } |
| 548 | #endif |
| 549 | |
| 550 | #endif /* _LINUX_HUGE_MM_H */ |