1 // SPDX-License-Identifier: GPL-2.0
4 #include <linux/hugetlb.h>
5 #include <asm/pgalloc.h>
6 #include <asm/pgtable.h>
8 #include <asm/fixmap.h>
11 #ifdef CONFIG_DYNAMIC_PHYSICAL_MASK
12 phys_addr_t physical_mask __ro_after_init = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;
13 EXPORT_SYMBOL(physical_mask);
17 #define PGTABLE_HIGHMEM __GFP_HIGHMEM
19 #define PGTABLE_HIGHMEM 0
22 gfp_t __userpte_alloc_gfp = GFP_PGTABLE_USER | PGTABLE_HIGHMEM;
24 pgtable_t pte_alloc_one(struct mm_struct *mm)
26 return __pte_alloc_one(mm, __userpte_alloc_gfp);
29 static int __init setup_userpte(char *arg)
35 * "userpte=nohigh" disables allocation of user pagetables in
38 if (strcmp(arg, "nohigh") == 0)
39 __userpte_alloc_gfp &= ~__GFP_HIGHMEM;
44 early_param("userpte", setup_userpte);
46 void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
48 pgtable_page_dtor(pte);
49 paravirt_release_pte(page_to_pfn(pte));
50 paravirt_tlb_remove_table(tlb, pte);
53 #if CONFIG_PGTABLE_LEVELS > 2
54 void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
56 struct page *page = virt_to_page(pmd);
57 paravirt_release_pmd(__pa(pmd) >> PAGE_SHIFT);
59 * NOTE! For PAE, any changes to the top page-directory-pointer-table
60 * entries need a full cr3 reload to flush.
63 tlb->need_flush_all = 1;
65 pgtable_pmd_page_dtor(page);
66 paravirt_tlb_remove_table(tlb, page);
69 #if CONFIG_PGTABLE_LEVELS > 3
70 void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
72 paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
73 paravirt_tlb_remove_table(tlb, virt_to_page(pud));
76 #if CONFIG_PGTABLE_LEVELS > 4
77 void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
79 paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
80 paravirt_tlb_remove_table(tlb, virt_to_page(p4d));
82 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
83 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
84 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
86 static inline void pgd_list_add(pgd_t *pgd)
88 struct page *page = virt_to_page(pgd);
90 list_add(&page->lru, &pgd_list);
93 static inline void pgd_list_del(pgd_t *pgd)
95 struct page *page = virt_to_page(pgd);
100 #define UNSHARED_PTRS_PER_PGD \
101 (SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD)
102 #define MAX_UNSHARED_PTRS_PER_PGD \
103 max_t(size_t, KERNEL_PGD_BOUNDARY, PTRS_PER_PGD)
106 static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm)
108 virt_to_page(pgd)->pt_mm = mm;
111 struct mm_struct *pgd_page_get_mm(struct page *page)
116 static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)
118 /* If the pgd points to a shared pagetable level (either the
119 ptes in non-PAE, or shared PMD in PAE), then just copy the
120 references from swapper_pg_dir. */
121 if (CONFIG_PGTABLE_LEVELS == 2 ||
122 (CONFIG_PGTABLE_LEVELS == 3 && SHARED_KERNEL_PMD) ||
123 CONFIG_PGTABLE_LEVELS >= 4) {
124 clone_pgd_range(pgd + KERNEL_PGD_BOUNDARY,
125 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
129 /* list required to sync kernel mapping updates */
130 if (!SHARED_KERNEL_PMD) {
136 static void pgd_dtor(pgd_t *pgd)
138 if (SHARED_KERNEL_PMD)
141 spin_lock(&pgd_lock);
143 spin_unlock(&pgd_lock);
147 * List of all pgd's needed for non-PAE so it can invalidate entries
148 * in both cached and uncached pgd's; not needed for PAE since the
149 * kernel pmd is shared. If PAE were not to share the pmd a similar
150 * tactic would be needed. This is essentially codepath-based locking
151 * against pageattr.c; it is the unique case in which a valid change
152 * of kernel pagetables can't be lazily synchronized by vmalloc faults.
153 * vmalloc faults work because attached pagetables are never freed.
157 #ifdef CONFIG_X86_PAE
159 * In PAE mode, we need to do a cr3 reload (=tlb flush) when
160 * updating the top-level pagetable entries to guarantee the
161 * processor notices the update. Since this is expensive, and
162 * all 4 top-level entries are used almost immediately in a
163 * new process's life, we just pre-populate them here.
165 * Also, if we're in a paravirt environment where the kernel pmd is
166 * not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate
167 * and initialize the kernel pmds here.
169 #define PREALLOCATED_PMDS UNSHARED_PTRS_PER_PGD
170 #define MAX_PREALLOCATED_PMDS MAX_UNSHARED_PTRS_PER_PGD
173 * We allocate separate PMDs for the kernel part of the user page-table
174 * when PTI is enabled. We need them to map the per-process LDT into the
175 * user-space page-table.
177 #define PREALLOCATED_USER_PMDS (boot_cpu_has(X86_FEATURE_PTI) ? \
179 #define MAX_PREALLOCATED_USER_PMDS KERNEL_PGD_PTRS
181 void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
183 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
185 /* Note: almost everything apart from _PAGE_PRESENT is
186 reserved at the pmd (PDPT) level. */
187 set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
190 * According to Intel App note "TLBs, Paging-Structure Caches,
191 * and Their Invalidation", April 2007, document 317080-001,
192 * section 8.1: in PAE mode we explicitly have to flush the
193 * TLB via cr3 if the top-level pgd is changed...
197 #else /* !CONFIG_X86_PAE */
199 /* No need to prepopulate any pagetable entries in non-PAE modes. */
200 #define PREALLOCATED_PMDS 0
201 #define MAX_PREALLOCATED_PMDS 0
202 #define PREALLOCATED_USER_PMDS 0
203 #define MAX_PREALLOCATED_USER_PMDS 0
204 #endif /* CONFIG_X86_PAE */
206 static void free_pmds(struct mm_struct *mm, pmd_t *pmds[], int count)
210 for (i = 0; i < count; i++)
212 pgtable_pmd_page_dtor(virt_to_page(pmds[i]));
213 free_page((unsigned long)pmds[i]);
218 static int preallocate_pmds(struct mm_struct *mm, pmd_t *pmds[], int count)
222 gfp_t gfp = GFP_PGTABLE_USER;
225 gfp &= ~__GFP_ACCOUNT;
227 for (i = 0; i < count; i++) {
228 pmd_t *pmd = (pmd_t *)__get_free_page(gfp);
231 if (pmd && !pgtable_pmd_page_ctor(virt_to_page(pmd))) {
232 free_page((unsigned long)pmd);
242 free_pmds(mm, pmds, count);
250 * Mop up any pmd pages which may still be attached to the pgd.
251 * Normally they will be freed by munmap/exit_mmap, but any pmd we
252 * preallocate which never got a corresponding vma will need to be
255 static void mop_up_one_pmd(struct mm_struct *mm, pgd_t *pgdp)
259 if (pgd_val(pgd) != 0) {
260 pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd);
264 paravirt_release_pmd(pgd_val(pgd) >> PAGE_SHIFT);
270 static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
274 for (i = 0; i < PREALLOCATED_PMDS; i++)
275 mop_up_one_pmd(mm, &pgdp[i]);
277 #ifdef CONFIG_PAGE_TABLE_ISOLATION
279 if (!boot_cpu_has(X86_FEATURE_PTI))
282 pgdp = kernel_to_user_pgdp(pgdp);
284 for (i = 0; i < PREALLOCATED_USER_PMDS; i++)
285 mop_up_one_pmd(mm, &pgdp[i + KERNEL_PGD_BOUNDARY]);
289 static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
295 if (PREALLOCATED_PMDS == 0) /* Work around gcc-3.4.x bug */
298 p4d = p4d_offset(pgd, 0);
299 pud = pud_offset(p4d, 0);
301 for (i = 0; i < PREALLOCATED_PMDS; i++, pud++) {
302 pmd_t *pmd = pmds[i];
304 if (i >= KERNEL_PGD_BOUNDARY)
305 memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]),
306 sizeof(pmd_t) * PTRS_PER_PMD);
308 pud_populate(mm, pud, pmd);
312 #ifdef CONFIG_PAGE_TABLE_ISOLATION
313 static void pgd_prepopulate_user_pmd(struct mm_struct *mm,
314 pgd_t *k_pgd, pmd_t *pmds[])
316 pgd_t *s_pgd = kernel_to_user_pgdp(swapper_pg_dir);
317 pgd_t *u_pgd = kernel_to_user_pgdp(k_pgd);
322 u_p4d = p4d_offset(u_pgd, 0);
323 u_pud = pud_offset(u_p4d, 0);
325 s_pgd += KERNEL_PGD_BOUNDARY;
326 u_pud += KERNEL_PGD_BOUNDARY;
328 for (i = 0; i < PREALLOCATED_USER_PMDS; i++, u_pud++, s_pgd++) {
329 pmd_t *pmd = pmds[i];
331 memcpy(pmd, (pmd_t *)pgd_page_vaddr(*s_pgd),
332 sizeof(pmd_t) * PTRS_PER_PMD);
334 pud_populate(mm, u_pud, pmd);
339 static void pgd_prepopulate_user_pmd(struct mm_struct *mm,
340 pgd_t *k_pgd, pmd_t *pmds[])
345 * Xen paravirt assumes pgd table should be in one page. 64 bit kernel also
346 * assumes that pgd should be in one page.
348 * But kernel with PAE paging that is not running as a Xen domain
349 * only needs to allocate 32 bytes for pgd instead of one page.
351 #ifdef CONFIG_X86_PAE
353 #include <linux/slab.h>
355 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
358 static struct kmem_cache *pgd_cache;
360 void __init pgd_cache_init(void)
363 * When PAE kernel is running as a Xen domain, it does not use
364 * shared kernel pmd. And this requires a whole page for pgd.
366 if (!SHARED_KERNEL_PMD)
370 * when PAE kernel is not running as a Xen domain, it uses
371 * shared kernel pmd. Shared kernel pmd does not require a whole
372 * page for pgd. We are able to just allocate a 32-byte for pgd.
373 * During boot time, we create a 32-byte slab for pgd table allocation.
375 pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_ALIGN,
379 static inline pgd_t *_pgd_alloc(void)
382 * If no SHARED_KERNEL_PMD, PAE kernel is running as a Xen domain.
383 * We allocate one page for pgd.
385 if (!SHARED_KERNEL_PMD)
386 return (pgd_t *)__get_free_pages(GFP_PGTABLE_USER,
387 PGD_ALLOCATION_ORDER);
390 * Now PAE kernel is not running as a Xen domain. We can allocate
391 * a 32-byte slab for pgd to save memory space.
393 return kmem_cache_alloc(pgd_cache, GFP_PGTABLE_USER);
396 static inline void _pgd_free(pgd_t *pgd)
398 if (!SHARED_KERNEL_PMD)
399 free_pages((unsigned long)pgd, PGD_ALLOCATION_ORDER);
401 kmem_cache_free(pgd_cache, pgd);
405 void __init pgd_cache_init(void)
409 static inline pgd_t *_pgd_alloc(void)
411 return (pgd_t *)__get_free_pages(GFP_PGTABLE_USER,
412 PGD_ALLOCATION_ORDER);
415 static inline void _pgd_free(pgd_t *pgd)
417 free_pages((unsigned long)pgd, PGD_ALLOCATION_ORDER);
419 #endif /* CONFIG_X86_PAE */
421 pgd_t *pgd_alloc(struct mm_struct *mm)
424 pmd_t *u_pmds[MAX_PREALLOCATED_USER_PMDS];
425 pmd_t *pmds[MAX_PREALLOCATED_PMDS];
434 if (preallocate_pmds(mm, pmds, PREALLOCATED_PMDS) != 0)
437 if (preallocate_pmds(mm, u_pmds, PREALLOCATED_USER_PMDS) != 0)
440 if (paravirt_pgd_alloc(mm) != 0)
441 goto out_free_user_pmds;
444 * Make sure that pre-populating the pmds is atomic with
445 * respect to anything walking the pgd_list, so that they
446 * never see a partially populated pgd.
448 spin_lock(&pgd_lock);
451 pgd_prepopulate_pmd(mm, pgd, pmds);
452 pgd_prepopulate_user_pmd(mm, pgd, u_pmds);
454 spin_unlock(&pgd_lock);
459 free_pmds(mm, u_pmds, PREALLOCATED_USER_PMDS);
461 free_pmds(mm, pmds, PREALLOCATED_PMDS);
468 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
470 pgd_mop_up_pmds(mm, pgd);
472 paravirt_pgd_free(mm, pgd);
477 * Used to set accessed or dirty bits in the page table entries
478 * on other architectures. On x86, the accessed and dirty bits
479 * are tracked by hardware. However, do_wp_page calls this function
480 * to also make the pte writeable at the same time the dirty bit is
481 * set. In that case we do actually need to write the PTE.
483 int ptep_set_access_flags(struct vm_area_struct *vma,
484 unsigned long address, pte_t *ptep,
485 pte_t entry, int dirty)
487 int changed = !pte_same(*ptep, entry);
489 if (changed && dirty)
490 set_pte(ptep, entry);
495 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
496 int pmdp_set_access_flags(struct vm_area_struct *vma,
497 unsigned long address, pmd_t *pmdp,
498 pmd_t entry, int dirty)
500 int changed = !pmd_same(*pmdp, entry);
502 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
504 if (changed && dirty) {
505 set_pmd(pmdp, entry);
507 * We had a write-protection fault here and changed the pmd
508 * to to more permissive. No need to flush the TLB for that,
509 * #PF is architecturally guaranteed to do that and in the
510 * worst-case we'll generate a spurious fault.
517 int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
518 pud_t *pudp, pud_t entry, int dirty)
520 int changed = !pud_same(*pudp, entry);
522 VM_BUG_ON(address & ~HPAGE_PUD_MASK);
524 if (changed && dirty) {
525 set_pud(pudp, entry);
527 * We had a write-protection fault here and changed the pud
528 * to to more permissive. No need to flush the TLB for that,
529 * #PF is architecturally guaranteed to do that and in the
530 * worst-case we'll generate a spurious fault.
538 int ptep_test_and_clear_young(struct vm_area_struct *vma,
539 unsigned long addr, pte_t *ptep)
543 if (pte_young(*ptep))
544 ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
545 (unsigned long *) &ptep->pte);
550 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
551 int pmdp_test_and_clear_young(struct vm_area_struct *vma,
552 unsigned long addr, pmd_t *pmdp)
556 if (pmd_young(*pmdp))
557 ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
558 (unsigned long *)pmdp);
562 int pudp_test_and_clear_young(struct vm_area_struct *vma,
563 unsigned long addr, pud_t *pudp)
567 if (pud_young(*pudp))
568 ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
569 (unsigned long *)pudp);
575 int ptep_clear_flush_young(struct vm_area_struct *vma,
576 unsigned long address, pte_t *ptep)
579 * On x86 CPUs, clearing the accessed bit without a TLB flush
580 * doesn't cause data corruption. [ It could cause incorrect
581 * page aging and the (mistaken) reclaim of hot pages, but the
582 * chance of that should be relatively low. ]
584 * So as a performance optimization don't flush the TLB when
585 * clearing the accessed bit, it will eventually be flushed by
586 * a context switch or a VM operation anyway. [ In the rare
587 * event of it not getting flushed for a long time the delay
588 * shouldn't really matter because there's no real memory
589 * pressure for swapout to react to. ]
591 return ptep_test_and_clear_young(vma, address, ptep);
594 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
595 int pmdp_clear_flush_young(struct vm_area_struct *vma,
596 unsigned long address, pmd_t *pmdp)
600 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
602 young = pmdp_test_and_clear_young(vma, address, pmdp);
604 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
611 * reserve_top_address - reserves a hole in the top of kernel address space
612 * @reserve - size of hole to reserve
614 * Can be used to relocate the fixmap area and poke a hole in the top
615 * of kernel address space to make room for a hypervisor.
617 void __init reserve_top_address(unsigned long reserve)
620 BUG_ON(fixmaps_set > 0);
621 __FIXADDR_TOP = round_down(-reserve, 1 << PMD_SHIFT) - PAGE_SIZE;
622 printk(KERN_INFO "Reserving virtual address space above 0x%08lx (rounded to 0x%08lx)\n",
623 -reserve, __FIXADDR_TOP + PAGE_SIZE);
629 void __native_set_fixmap(enum fixed_addresses idx, pte_t pte)
631 unsigned long address = __fix_to_virt(idx);
635 * Ensure that the static initial page tables are covering the
638 BUILD_BUG_ON(__end_of_permanent_fixed_addresses >
639 (FIXMAP_PMD_NUM * PTRS_PER_PTE));
642 if (idx >= __end_of_fixed_addresses) {
646 set_pte_vaddr(address, pte);
650 void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
653 /* Sanitize 'prot' against any unsupported bits: */
654 pgprot_val(flags) &= __default_kernel_pte_mask;
656 __native_set_fixmap(idx, pfn_pte(phys >> PAGE_SHIFT, flags));
659 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
660 #ifdef CONFIG_X86_5LEVEL
662 * p4d_set_huge - setup kernel P4D mapping
664 * No 512GB pages yet -- always return 0
666 int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
672 * p4d_clear_huge - clear kernel P4D mapping when it is set
674 * No 512GB pages yet -- always return 0
676 int p4d_clear_huge(p4d_t *p4d)
683 * pud_set_huge - setup kernel PUD mapping
685 * MTRRs can override PAT memory types with 4KiB granularity. Therefore, this
686 * function sets up a huge page only if any of the following conditions are met:
688 * - MTRRs are disabled, or
690 * - MTRRs are enabled and the range is completely covered by a single MTRR, or
692 * - MTRRs are enabled and the corresponding MTRR memory type is WB, which
693 * has no effect on the requested PAT memory type.
695 * Callers should try to decrease page size (1GB -> 2MB -> 4K) if the bigger
696 * page mapping attempt fails.
698 * Returns 1 on success and 0 on failure.
700 int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
704 mtrr = mtrr_type_lookup(addr, addr + PUD_SIZE, &uniform);
705 if ((mtrr != MTRR_TYPE_INVALID) && (!uniform) &&
706 (mtrr != MTRR_TYPE_WRBACK))
709 /* Bail out if we are we on a populated non-leaf entry: */
710 if (pud_present(*pud) && !pud_huge(*pud))
713 prot = pgprot_4k_2_large(prot);
715 set_pte((pte_t *)pud, pfn_pte(
716 (u64)addr >> PAGE_SHIFT,
717 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
723 * pmd_set_huge - setup kernel PMD mapping
725 * See text over pud_set_huge() above.
727 * Returns 1 on success and 0 on failure.
729 int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
733 mtrr = mtrr_type_lookup(addr, addr + PMD_SIZE, &uniform);
734 if ((mtrr != MTRR_TYPE_INVALID) && (!uniform) &&
735 (mtrr != MTRR_TYPE_WRBACK)) {
736 pr_warn_once("%s: Cannot satisfy [mem %#010llx-%#010llx] with a huge-page mapping due to MTRR override.\n",
737 __func__, addr, addr + PMD_SIZE);
741 /* Bail out if we are we on a populated non-leaf entry: */
742 if (pmd_present(*pmd) && !pmd_huge(*pmd))
745 prot = pgprot_4k_2_large(prot);
747 set_pte((pte_t *)pmd, pfn_pte(
748 (u64)addr >> PAGE_SHIFT,
749 __pgprot(pgprot_val(prot) | _PAGE_PSE)));
755 * pud_clear_huge - clear kernel PUD mapping when it is set
757 * Returns 1 on success and 0 on failure (no PUD map is found).
759 int pud_clear_huge(pud_t *pud)
761 if (pud_large(*pud)) {
770 * pmd_clear_huge - clear kernel PMD mapping when it is set
772 * Returns 1 on success and 0 on failure (no PMD map is found).
774 int pmd_clear_huge(pmd_t *pmd)
776 if (pmd_large(*pmd)) {
785 * Until we support 512GB pages, skip them in the vmap area.
787 int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
794 * pud_free_pmd_page - Clear pud entry and free pmd page.
795 * @pud: Pointer to a PUD.
796 * @addr: Virtual address associated with pud.
798 * Context: The pud range has been unmapped and TLB purged.
799 * Return: 1 if clearing the entry succeeded. 0 otherwise.
801 * NOTE: Callers must allow a single page allocation.
803 int pud_free_pmd_page(pud_t *pud, unsigned long addr)
809 pmd = (pmd_t *)pud_page_vaddr(*pud);
810 pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
814 for (i = 0; i < PTRS_PER_PMD; i++) {
816 if (!pmd_none(pmd[i]))
822 /* INVLPG to clear all paging-structure caches */
823 flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);
825 for (i = 0; i < PTRS_PER_PMD; i++) {
826 if (!pmd_none(pmd_sv[i])) {
827 pte = (pte_t *)pmd_page_vaddr(pmd_sv[i]);
828 free_page((unsigned long)pte);
832 free_page((unsigned long)pmd_sv);
833 free_page((unsigned long)pmd);
839 * pmd_free_pte_page - Clear pmd entry and free pte page.
840 * @pmd: Pointer to a PMD.
841 * @addr: Virtual address associated with pmd.
843 * Context: The pmd range has been unmapped and TLB purged.
844 * Return: 1 if clearing the entry succeeded. 0 otherwise.
846 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
850 pte = (pte_t *)pmd_page_vaddr(*pmd);
853 /* INVLPG to clear all paging-structure caches */
854 flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);
856 free_page((unsigned long)pte);
861 #else /* !CONFIG_X86_64 */
863 int pud_free_pmd_page(pud_t *pud, unsigned long addr)
865 return pud_none(*pud);
869 * Disable free page handling on x86-PAE. This assures that ioremap()
870 * does not update sync'd pmd entries. See vmalloc_sync_one().
872 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
874 return pmd_none(*pmd);
877 #endif /* CONFIG_X86_64 */
878 #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */