1 #ifndef _ASM_GENERIC_PGTABLE_H
2 #define _ASM_GENERIC_PGTABLE_H
9 #include <linux/mm_types.h>
10 #include <linux/bug.h>
11 #include <linux/errno.h>
13 #if 4 - defined(__PAGETABLE_PUD_FOLDED) - defined(__PAGETABLE_PMD_FOLDED) != \
15 #error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{PUD,PMD}_FOLDED
19 * On almost all architectures and configurations, 0 can be used as the
20 * upper ceiling to free_pgtables(): on many architectures it has the same
21 * effect as using TASK_SIZE. However, there is one configuration which
22 * must impose a more careful limit, to avoid freeing kernel pgtables.
24 #ifndef USER_PGTABLES_CEILING
25 #define USER_PGTABLES_CEILING 0UL
28 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
29 extern int ptep_set_access_flags(struct vm_area_struct *vma,
30 unsigned long address, pte_t *ptep,
31 pte_t entry, int dirty);
34 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
35 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
36 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
37 unsigned long address, pmd_t *pmdp,
38 pmd_t entry, int dirty);
40 static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
41 unsigned long address, pmd_t *pmdp,
42 pmd_t entry, int dirty)
47 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
50 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
51 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
52 unsigned long address,
60 set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte));
65 #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
66 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
67 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
68 unsigned long address,
76 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
80 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
81 unsigned long address,
87 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
90 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
91 int ptep_clear_flush_young(struct vm_area_struct *vma,
92 unsigned long address, pte_t *ptep);
95 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
96 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
97 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
98 unsigned long address, pmd_t *pmdp);
101 * Despite relevant to THP only, this API is called from generic rmap code
102 * under PageTransHuge(), hence needs a dummy implementation for !THP
104 static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
105 unsigned long address, pmd_t *pmdp)
110 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
113 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
114 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
115 unsigned long address,
119 pte_clear(mm, address, ptep);
124 #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
125 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
126 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
127 unsigned long address,
134 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
137 #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
138 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
139 static inline pmd_t pmdp_huge_get_and_clear_full(struct mm_struct *mm,
140 unsigned long address, pmd_t *pmdp,
143 return pmdp_huge_get_and_clear(mm, address, pmdp);
145 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
148 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
149 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
150 unsigned long address, pte_t *ptep,
154 pte = ptep_get_and_clear(mm, address, ptep);
160 * Some architectures may be able to avoid expensive synchronization
161 * primitives when modifications are made to PTE's which are already
162 * not present, or in the process of an address space destruction.
164 #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL
165 static inline void pte_clear_not_present_full(struct mm_struct *mm,
166 unsigned long address,
170 pte_clear(mm, address, ptep);
174 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
175 extern pte_t ptep_clear_flush(struct vm_area_struct *vma,
176 unsigned long address,
180 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
181 extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
182 unsigned long address,
186 #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
188 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
190 pte_t old_pte = *ptep;
191 set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
195 #ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT
196 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
197 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
198 unsigned long address, pmd_t *pmdp)
200 pmd_t old_pmd = *pmdp;
201 set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
204 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
205 unsigned long address, pmd_t *pmdp)
209 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
212 #ifndef pmdp_collapse_flush
213 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
214 extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
215 unsigned long address, pmd_t *pmdp);
217 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
218 unsigned long address,
224 #define pmdp_collapse_flush pmdp_collapse_flush
225 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
228 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
229 extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
233 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
234 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
237 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
239 * This is an implementation of pmdp_establish() that is only suitable for an
240 * architecture that doesn't have hardware dirty/accessed bits. In this case we
241 * can't race with CPU which sets these bits and non-atomic aproach is fine.
243 static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma,
244 unsigned long address, pmd_t *pmdp, pmd_t pmd)
246 pmd_t old_pmd = *pmdp;
247 set_pmd_at(vma->vm_mm, address, pmdp, pmd);
252 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
253 extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
257 #ifndef __HAVE_ARCH_PMDP_HUGE_SPLIT_PREPARE
258 static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma,
259 unsigned long address, pmd_t *pmdp)
265 #ifndef __HAVE_ARCH_PTE_SAME
266 static inline int pte_same(pte_t pte_a, pte_t pte_b)
268 return pte_val(pte_a) == pte_val(pte_b);
272 #ifndef __HAVE_ARCH_PTE_UNUSED
274 * Some architectures provide facilities to virtualization guests
275 * so that they can flag allocated pages as unused. This allows the
276 * host to transparently reclaim unused pages. This function returns
277 * whether the pte's page is unused.
279 static inline int pte_unused(pte_t pte)
285 #ifndef __HAVE_ARCH_PMD_SAME
286 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
287 static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
289 return pmd_val(pmd_a) == pmd_val(pmd_b);
291 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
292 static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
297 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
300 #ifndef __HAVE_ARCH_PGD_OFFSET_GATE
301 #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
304 #ifndef __HAVE_ARCH_MOVE_PTE
305 #define move_pte(pte, prot, old_addr, new_addr) (pte)
308 #ifndef pte_accessible
309 # define pte_accessible(mm, pte) ((void)(pte), 1)
312 #ifndef flush_tlb_fix_spurious_fault
313 #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
316 #ifndef pgprot_noncached
317 #define pgprot_noncached(prot) (prot)
320 #ifndef pgprot_writecombine
321 #define pgprot_writecombine pgprot_noncached
324 #ifndef pgprot_writethrough
325 #define pgprot_writethrough pgprot_noncached
328 #ifndef pgprot_device
329 #define pgprot_device pgprot_noncached
332 #ifndef pgprot_modify
333 #define pgprot_modify pgprot_modify
334 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
336 if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot)))
337 newprot = pgprot_noncached(newprot);
338 if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot)))
339 newprot = pgprot_writecombine(newprot);
340 if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot)))
341 newprot = pgprot_device(newprot);
347 * When walking page tables, get the address of the next boundary,
348 * or the end address of the range if that comes earlier. Although no
349 * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
352 #define pgd_addr_end(addr, end) \
353 ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
354 (__boundary - 1 < (end) - 1)? __boundary: (end); \
358 #define pud_addr_end(addr, end) \
359 ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
360 (__boundary - 1 < (end) - 1)? __boundary: (end); \
365 #define pmd_addr_end(addr, end) \
366 ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
367 (__boundary - 1 < (end) - 1)? __boundary: (end); \
372 * When walking page tables, we usually want to skip any p?d_none entries;
373 * and any p?d_bad entries - reporting the error before resetting to none.
374 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
376 void pgd_clear_bad(pgd_t *);
377 void pud_clear_bad(pud_t *);
378 void pmd_clear_bad(pmd_t *);
380 static inline int pgd_none_or_clear_bad(pgd_t *pgd)
384 if (unlikely(pgd_bad(*pgd))) {
391 static inline int pud_none_or_clear_bad(pud_t *pud)
395 if (unlikely(pud_bad(*pud))) {
402 static inline int pmd_none_or_clear_bad(pmd_t *pmd)
406 if (unlikely(pmd_bad(*pmd))) {
413 static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
418 * Get the current pte state, but zero it out to make it
419 * non-present, preventing the hardware from asynchronously
422 return ptep_get_and_clear(mm, addr, ptep);
425 static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
427 pte_t *ptep, pte_t pte)
430 * The pte is non-present, so there's no hardware state to
433 set_pte_at(mm, addr, ptep, pte);
436 #ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
438 * Start a pte protection read-modify-write transaction, which
439 * protects against asynchronous hardware modifications to the pte.
440 * The intention is not to prevent the hardware from making pte
441 * updates, but to prevent any updates it may make from being lost.
443 * This does not protect against other software modifications of the
444 * pte; the appropriate pte lock must be held over the transation.
446 * Note that this interface is intended to be batchable, meaning that
447 * ptep_modify_prot_commit may not actually update the pte, but merely
448 * queue the update to be done at some later time. The update must be
449 * actually committed before the pte lock is released, however.
451 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
455 return __ptep_modify_prot_start(mm, addr, ptep);
459 * Commit an update to a pte, leaving any hardware-controlled bits in
460 * the PTE unmodified.
462 static inline void ptep_modify_prot_commit(struct mm_struct *mm,
464 pte_t *ptep, pte_t pte)
466 __ptep_modify_prot_commit(mm, addr, ptep, pte);
468 #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */
469 #endif /* CONFIG_MMU */
472 * A facility to provide lazy MMU batching. This allows PTE updates and
473 * page invalidations to be delayed until a call to leave lazy MMU mode
474 * is issued. Some architectures may benefit from doing this, and it is
475 * beneficial for both shadow and direct mode hypervisors, which may batch
476 * the PTE updates which happen during this window. Note that using this
477 * interface requires that read hazards be removed from the code. A read
478 * hazard could result in the direct mode hypervisor case, since the actual
479 * write to the page tables may not yet have taken place, so reads though
480 * a raw PTE pointer after it has been modified are not guaranteed to be
481 * up to date. This mode can only be entered and left under the protection of
482 * the page table locks for all page tables which may be modified. In the UP
483 * case, this is required so that preemption is disabled, and in the SMP case,
484 * it must synchronize the delayed page table writes properly on other CPUs.
486 #ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
487 #define arch_enter_lazy_mmu_mode() do {} while (0)
488 #define arch_leave_lazy_mmu_mode() do {} while (0)
489 #define arch_flush_lazy_mmu_mode() do {} while (0)
493 * A facility to provide batching of the reload of page tables and
494 * other process state with the actual context switch code for
495 * paravirtualized guests. By convention, only one of the batched
496 * update (lazy) modes (CPU, MMU) should be active at any given time,
497 * entry should never be nested, and entry and exits should always be
498 * paired. This is for sanity of maintaining and reasoning about the
499 * kernel code. In this case, the exit (end of the context switch) is
500 * in architecture-specific code, and so doesn't need a generic
503 #ifndef __HAVE_ARCH_START_CONTEXT_SWITCH
504 #define arch_start_context_switch(prev) do {} while (0)
507 #ifndef CONFIG_HAVE_ARCH_SOFT_DIRTY
508 static inline int pte_soft_dirty(pte_t pte)
513 static inline int pmd_soft_dirty(pmd_t pmd)
518 static inline pte_t pte_mksoft_dirty(pte_t pte)
523 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
528 static inline pte_t pte_clear_soft_dirty(pte_t pte)
533 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
538 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
543 static inline int pte_swp_soft_dirty(pte_t pte)
548 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
554 #ifndef __HAVE_PFNMAP_TRACKING
556 * Interfaces that can be used by architecture code to keep track of
557 * memory type of pfn mappings specified by the remap_pfn_range,
562 * track_pfn_remap is called when a _new_ pfn mapping is being established
563 * by remap_pfn_range() for physical range indicated by pfn and size.
565 static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
566 unsigned long pfn, unsigned long addr,
573 * track_pfn_insert is called when a _new_ single pfn is established
574 * by vm_insert_pfn().
576 static inline int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
583 * track_pfn_copy is called when vma that is covering the pfnmap gets
584 * copied through copy_page_range().
586 static inline int track_pfn_copy(struct vm_area_struct *vma)
592 * untrack_pfn is called while unmapping a pfnmap for a region.
593 * untrack can be called for a specific region indicated by pfn and size or
594 * can be for the entire vma (in which case pfn, size are zero).
596 static inline void untrack_pfn(struct vm_area_struct *vma,
597 unsigned long pfn, unsigned long size)
602 * untrack_pfn_moved is called while mremapping a pfnmap for a new region.
604 static inline void untrack_pfn_moved(struct vm_area_struct *vma)
608 extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
609 unsigned long pfn, unsigned long addr,
611 extern int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
613 extern int track_pfn_copy(struct vm_area_struct *vma);
614 extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
616 extern void untrack_pfn_moved(struct vm_area_struct *vma);
619 #ifdef __HAVE_COLOR_ZERO_PAGE
620 static inline int is_zero_pfn(unsigned long pfn)
622 extern unsigned long zero_pfn;
623 unsigned long offset_from_zero_pfn = pfn - zero_pfn;
624 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
627 #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
630 static inline int is_zero_pfn(unsigned long pfn)
632 extern unsigned long zero_pfn;
633 return pfn == zero_pfn;
636 static inline unsigned long my_zero_pfn(unsigned long addr)
638 extern unsigned long zero_pfn;
645 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
646 static inline int pmd_trans_huge(pmd_t pmd)
650 #ifndef __HAVE_ARCH_PMD_WRITE
651 static inline int pmd_write(pmd_t pmd)
656 #endif /* __HAVE_ARCH_PMD_WRITE */
657 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
659 #ifndef pmd_read_atomic
660 static inline pmd_t pmd_read_atomic(pmd_t *pmdp)
663 * Depend on compiler for an atomic pmd read. NOTE: this is
664 * only going to work, if the pmdval_t isn't larger than
671 #ifndef pmd_move_must_withdraw
672 static inline int pmd_move_must_withdraw(spinlock_t *new_pmd_ptl,
673 spinlock_t *old_pmd_ptl)
676 * With split pmd lock we also need to move preallocated
677 * PTE page table if new_pmd is on different PMD page table.
679 return new_pmd_ptl != old_pmd_ptl;
684 * This function is meant to be used by sites walking pagetables with
685 * the mmap_sem hold in read mode to protect against MADV_DONTNEED and
686 * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd
687 * into a null pmd and the transhuge page fault can convert a null pmd
688 * into an hugepmd or into a regular pmd (if the hugepage allocation
689 * fails). While holding the mmap_sem in read mode the pmd becomes
690 * stable and stops changing under us only if it's not null and not a
691 * transhuge pmd. When those races occurs and this function makes a
692 * difference vs the standard pmd_none_or_clear_bad, the result is
693 * undefined so behaving like if the pmd was none is safe (because it
694 * can return none anyway). The compiler level barrier() is critically
695 * important to compute the two checks atomically on the same pmdval.
697 * For 32bit kernels with a 64bit large pmd_t this automatically takes
698 * care of reading the pmd atomically to avoid SMP race conditions
699 * against pmd_populate() when the mmap_sem is hold for reading by the
700 * caller (a special atomic read not done by "gcc" as in the generic
701 * version above, is also needed when THP is disabled because the page
702 * fault can populate the pmd from under us).
704 static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd)
706 pmd_t pmdval = pmd_read_atomic(pmd);
708 * The barrier will stabilize the pmdval in a register or on
709 * the stack so that it will stop changing under the code.
711 * When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE,
712 * pmd_read_atomic is allowed to return a not atomic pmdval
713 * (for example pointing to an hugepage that has never been
714 * mapped in the pmd). The below checks will only care about
715 * the low part of the pmd with 32bit PAE x86 anyway, with the
716 * exception of pmd_none(). So the important thing is that if
717 * the low part of the pmd is found null, the high part will
718 * be also null or the pmd_none() check below would be
721 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
724 if (pmd_none(pmdval) || pmd_trans_huge(pmdval))
726 if (unlikely(pmd_bad(pmdval))) {
734 * This is a noop if Transparent Hugepage Support is not built into
735 * the kernel. Otherwise it is equivalent to
736 * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in
737 * places that already verified the pmd is not none and they want to
738 * walk ptes while holding the mmap sem in read mode (write mode don't
739 * need this). If THP is not enabled, the pmd can't go away under the
740 * code even if MADV_DONTNEED runs, but if THP is enabled we need to
741 * run a pmd_trans_unstable before walking the ptes after
742 * split_huge_page_pmd returns (because it may have run when the pmd
743 * become null, but then a page fault can map in a THP and not a
746 static inline int pmd_trans_unstable(pmd_t *pmd)
748 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
749 return pmd_none_or_trans_huge_or_clear_bad(pmd);
755 #ifndef CONFIG_NUMA_BALANCING
757 * Technically a PTE can be PROTNONE even when not doing NUMA balancing but
758 * the only case the kernel cares is for NUMA balancing and is only ever set
759 * when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked
760 * _PAGE_PROTNONE so by by default, implement the helper as "always no". It
761 * is the responsibility of the caller to distinguish between PROT_NONE
762 * protections and NUMA hinting fault protections.
764 static inline int pte_protnone(pte_t pte)
769 static inline int pmd_protnone(pmd_t pmd)
773 #endif /* CONFIG_NUMA_BALANCING */
775 #endif /* CONFIG_MMU */
777 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
778 int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
779 int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot);
780 int pud_clear_huge(pud_t *pud);
781 int pmd_clear_huge(pmd_t *pmd);
782 int pud_free_pmd_page(pud_t *pud, unsigned long addr);
783 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr);
784 #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
785 static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
789 static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
793 static inline int pud_clear_huge(pud_t *pud)
797 static inline int pmd_clear_huge(pmd_t *pmd)
801 static inline int pud_free_pmd_page(pud_t *pud, unsigned long addr)
805 static inline int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
809 #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
811 #ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
812 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
814 * ARCHes with special requirements for evicting THP backing TLB entries can
815 * implement this. Otherwise also, it can help optimize normal TLB flush in
816 * THP regime. stock flush_tlb_range() typically has optimization to nuke the
817 * entire TLB TLB if flush span is greater than a threshold, which will
818 * likely be true for a single huge page. Thus a single thp flush will
819 * invalidate the entire TLB which is not desitable.
820 * e.g. see arch/arc: flush_pmd_tlb_range
822 #define flush_pmd_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
824 #define flush_pmd_tlb_range(vma, addr, end) BUILD_BUG()
829 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
830 unsigned long size, pgprot_t *vma_prot);
832 #ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED
833 static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot)
838 static inline bool arch_has_pfn_modify_check(void)
842 #endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */
844 #endif /* !__ASSEMBLY__ */
846 #ifndef io_remap_pfn_range
847 #define io_remap_pfn_range remap_pfn_range
850 #if !defined(MAX_POSSIBLE_PHYSMEM_BITS) && !defined(CONFIG_64BIT)
851 #ifdef CONFIG_PHYS_ADDR_T_64BIT
853 * ZSMALLOC needs to know the highest PFN on 32-bit architectures
854 * with physical address space extension, but falls back to
855 * BITS_PER_LONG otherwise.
857 #error Missing MAX_POSSIBLE_PHYSMEM_BITS definition
859 #define MAX_POSSIBLE_PHYSMEM_BITS 32
863 #ifndef has_transparent_hugepage
864 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
865 #define has_transparent_hugepage() 1
867 #define has_transparent_hugepage() 0
871 #endif /* _ASM_GENERIC_PGTABLE_H */