1 // SPDX-License-Identifier: GPL-2.0
4 #include <linux/hugetlb.h>
5 #include <asm/pgalloc.h>
7 #include <asm/fixmap.h>
10 #ifdef CONFIG_DYNAMIC_PHYSICAL_MASK
11 phys_addr_t physical_mask __ro_after_init = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;
12 EXPORT_SYMBOL(physical_mask);
16 #define PGTABLE_HIGHMEM __GFP_HIGHMEM
18 #define PGTABLE_HIGHMEM 0
21 #ifndef CONFIG_PARAVIRT
23 void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)
25 tlb_remove_page(tlb, table);
29 gfp_t __userpte_alloc_gfp = GFP_PGTABLE_USER | PGTABLE_HIGHMEM;
31 pgtable_t pte_alloc_one(struct mm_struct *mm)
33 return __pte_alloc_one(mm, __userpte_alloc_gfp);
36 static int __init setup_userpte(char *arg)
42 * "userpte=nohigh" disables allocation of user pagetables in
45 if (strcmp(arg, "nohigh") == 0)
46 __userpte_alloc_gfp &= ~__GFP_HIGHMEM;
51 early_param("userpte", setup_userpte);
53 void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
55 pgtable_pte_page_dtor(pte);
56 paravirt_release_pte(page_to_pfn(pte));
57 paravirt_tlb_remove_table(tlb, pte);
60 #if CONFIG_PGTABLE_LEVELS > 2
61 void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
63 struct page *page = virt_to_page(pmd);
64 paravirt_release_pmd(__pa(pmd) >> PAGE_SHIFT);
66 * NOTE! For PAE, any changes to the top page-directory-pointer-table
67 * entries need a full cr3 reload to flush.
70 tlb->need_flush_all = 1;
72 pgtable_pmd_page_dtor(page);
73 paravirt_tlb_remove_table(tlb, page);
76 #if CONFIG_PGTABLE_LEVELS > 3
77 void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
79 paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
80 paravirt_tlb_remove_table(tlb, virt_to_page(pud));
83 #if CONFIG_PGTABLE_LEVELS > 4
84 void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
86 paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
87 paravirt_tlb_remove_table(tlb, virt_to_page(p4d));
89 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
90 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
91 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
93 static inline void pgd_list_add(pgd_t *pgd)
95 struct page *page = virt_to_page(pgd);
97 list_add(&page->lru, &pgd_list);
100 static inline void pgd_list_del(pgd_t *pgd)
102 struct page *page = virt_to_page(pgd);
104 list_del(&page->lru);
107 #define UNSHARED_PTRS_PER_PGD \
108 (SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD)
109 #define MAX_UNSHARED_PTRS_PER_PGD \
110 max_t(size_t, KERNEL_PGD_BOUNDARY, PTRS_PER_PGD)
113 static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm)
115 virt_to_page(pgd)->pt_mm = mm;
118 struct mm_struct *pgd_page_get_mm(struct page *page)
123 static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)
125 /* If the pgd points to a shared pagetable level (either the
126 ptes in non-PAE, or shared PMD in PAE), then just copy the
127 references from swapper_pg_dir. */
128 if (CONFIG_PGTABLE_LEVELS == 2 ||
129 (CONFIG_PGTABLE_LEVELS == 3 && SHARED_KERNEL_PMD) ||
130 CONFIG_PGTABLE_LEVELS >= 4) {
131 clone_pgd_range(pgd + KERNEL_PGD_BOUNDARY,
132 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
136 /* list required to sync kernel mapping updates */
137 if (!SHARED_KERNEL_PMD) {
143 static void pgd_dtor(pgd_t *pgd)
145 if (SHARED_KERNEL_PMD)
148 spin_lock(&pgd_lock);
150 spin_unlock(&pgd_lock);
154 * List of all pgd's needed for non-PAE so it can invalidate entries
155 * in both cached and uncached pgd's; not needed for PAE since the
156 * kernel pmd is shared. If PAE were not to share the pmd a similar
157 * tactic would be needed. This is essentially codepath-based locking
158 * against pageattr.c; it is the unique case in which a valid change
159 * of kernel pagetables can't be lazily synchronized by vmalloc faults.
160 * vmalloc faults work because attached pagetables are never freed.
164 #ifdef CONFIG_X86_PAE
166 * In PAE mode, we need to do a cr3 reload (=tlb flush) when
167 * updating the top-level pagetable entries to guarantee the
168 * processor notices the update. Since this is expensive, and
169 * all 4 top-level entries are used almost immediately in a
170 * new process's life, we just pre-populate them here.
172 * Also, if we're in a paravirt environment where the kernel pmd is
173 * not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate
174 * and initialize the kernel pmds here.
176 #define PREALLOCATED_PMDS UNSHARED_PTRS_PER_PGD
177 #define MAX_PREALLOCATED_PMDS MAX_UNSHARED_PTRS_PER_PGD
180 * We allocate separate PMDs for the kernel part of the user page-table
181 * when PTI is enabled. We need them to map the per-process LDT into the
182 * user-space page-table.
184 #define PREALLOCATED_USER_PMDS (boot_cpu_has(X86_FEATURE_PTI) ? \
186 #define MAX_PREALLOCATED_USER_PMDS KERNEL_PGD_PTRS
188 void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
190 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
192 /* Note: almost everything apart from _PAGE_PRESENT is
193 reserved at the pmd (PDPT) level. */
194 set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
197 * According to Intel App note "TLBs, Paging-Structure Caches,
198 * and Their Invalidation", April 2007, document 317080-001,
199 * section 8.1: in PAE mode we explicitly have to flush the
200 * TLB via cr3 if the top-level pgd is changed...
204 #else /* !CONFIG_X86_PAE */
206 /* No need to prepopulate any pagetable entries in non-PAE modes. */
207 #define PREALLOCATED_PMDS 0
208 #define MAX_PREALLOCATED_PMDS 0
209 #define PREALLOCATED_USER_PMDS 0
210 #define MAX_PREALLOCATED_USER_PMDS 0
211 #endif /* CONFIG_X86_PAE */
213 static void free_pmds(struct mm_struct *mm, pmd_t *pmds[], int count)
217 for (i = 0; i < count; i++)
219 pgtable_pmd_page_dtor(virt_to_page(pmds[i]));
220 free_page((unsigned long)pmds[i]);
225 static int preallocate_pmds(struct mm_struct *mm, pmd_t *pmds[], int count)
229 gfp_t gfp = GFP_PGTABLE_USER;
232 gfp &= ~__GFP_ACCOUNT;
234 for (i = 0; i < count; i++) {
235 pmd_t *pmd = (pmd_t *)__get_free_page(gfp);
238 if (pmd && !pgtable_pmd_page_ctor(virt_to_page(pmd))) {
239 free_page((unsigned long)pmd);
249 free_pmds(mm, pmds, count);
257 * Mop up any pmd pages which may still be attached to the pgd.
258 * Normally they will be freed by munmap/exit_mmap, but any pmd we
259 * preallocate which never got a corresponding vma will need to be
262 static void mop_up_one_pmd(struct mm_struct *mm, pgd_t *pgdp)
266 if (pgd_val(pgd) != 0) {
267 pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd);
271 paravirt_release_pmd(pgd_val(pgd) >> PAGE_SHIFT);
277 static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
281 for (i = 0; i < PREALLOCATED_PMDS; i++)
282 mop_up_one_pmd(mm, &pgdp[i]);
284 #ifdef CONFIG_PAGE_TABLE_ISOLATION
286 if (!boot_cpu_has(X86_FEATURE_PTI))
289 pgdp = kernel_to_user_pgdp(pgdp);
291 for (i = 0; i < PREALLOCATED_USER_PMDS; i++)
292 mop_up_one_pmd(mm, &pgdp[i + KERNEL_PGD_BOUNDARY]);
296 static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
302 if (PREALLOCATED_PMDS == 0) /* Work around gcc-3.4.x bug */
305 p4d = p4d_offset(pgd, 0);
306 pud = pud_offset(p4d, 0);
308 for (i = 0; i < PREALLOCATED_PMDS; i++, pud++) {
309 pmd_t *pmd = pmds[i];
311 if (i >= KERNEL_PGD_BOUNDARY)
312 memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]),
313 sizeof(pmd_t) * PTRS_PER_PMD);
315 pud_populate(mm, pud, pmd);
319 #ifdef CONFIG_PAGE_TABLE_ISOLATION
320 static void pgd_prepopulate_user_pmd(struct mm_struct *mm,
321 pgd_t *k_pgd, pmd_t *pmds[])
323 pgd_t *s_pgd = kernel_to_user_pgdp(swapper_pg_dir);
324 pgd_t *u_pgd = kernel_to_user_pgdp(k_pgd);
329 u_p4d = p4d_offset(u_pgd, 0);
330 u_pud = pud_offset(u_p4d, 0);
332 s_pgd += KERNEL_PGD_BOUNDARY;
333 u_pud += KERNEL_PGD_BOUNDARY;
335 for (i = 0; i < PREALLOCATED_USER_PMDS; i++, u_pud++, s_pgd++) {
336 pmd_t *pmd = pmds[i];
338 memcpy(pmd, (pmd_t *)pgd_page_vaddr(*s_pgd),
339 sizeof(pmd_t) * PTRS_PER_PMD);
341 pud_populate(mm, u_pud, pmd);
346 static void pgd_prepopulate_user_pmd(struct mm_struct *mm,
347 pgd_t *k_pgd, pmd_t *pmds[])
352 * Xen paravirt assumes pgd table should be in one page. 64 bit kernel also
353 * assumes that pgd should be in one page.
355 * But kernel with PAE paging that is not running as a Xen domain
356 * only needs to allocate 32 bytes for pgd instead of one page.
358 #ifdef CONFIG_X86_PAE
360 #include <linux/slab.h>
362 #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
365 static struct kmem_cache *pgd_cache;
367 void __init pgtable_cache_init(void)
370 * When PAE kernel is running as a Xen domain, it does not use
371 * shared kernel pmd. And this requires a whole page for pgd.
373 if (!SHARED_KERNEL_PMD)
377 * when PAE kernel is not running as a Xen domain, it uses
378 * shared kernel pmd. Shared kernel pmd does not require a whole
379 * page for pgd. We are able to just allocate a 32-byte for pgd.
380 * During boot time, we create a 32-byte slab for pgd table allocation.
382 pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_ALIGN,
386 static inline pgd_t *_pgd_alloc(void)
389 * If no SHARED_KERNEL_PMD, PAE kernel is running as a Xen domain.
390 * We allocate one page for pgd.
392 if (!SHARED_KERNEL_PMD)
393 return (pgd_t *)__get_free_pages(GFP_PGTABLE_USER,
394 PGD_ALLOCATION_ORDER);
397 * Now PAE kernel is not running as a Xen domain. We can allocate
398 * a 32-byte slab for pgd to save memory space.
400 return kmem_cache_alloc(pgd_cache, GFP_PGTABLE_USER);
403 static inline void _pgd_free(pgd_t *pgd)
405 if (!SHARED_KERNEL_PMD)
406 free_pages((unsigned long)pgd, PGD_ALLOCATION_ORDER);
408 kmem_cache_free(pgd_cache, pgd);
412 static inline pgd_t *_pgd_alloc(void)
414 return (pgd_t *)__get_free_pages(GFP_PGTABLE_USER,
415 PGD_ALLOCATION_ORDER);
418 static inline void _pgd_free(pgd_t *pgd)
420 free_pages((unsigned long)pgd, PGD_ALLOCATION_ORDER);
422 #endif /* CONFIG_X86_PAE */
424 pgd_t *pgd_alloc(struct mm_struct *mm)
427 pmd_t *u_pmds[MAX_PREALLOCATED_USER_PMDS];
428 pmd_t *pmds[MAX_PREALLOCATED_PMDS];
437 if (preallocate_pmds(mm, pmds, PREALLOCATED_PMDS) != 0)
440 if (preallocate_pmds(mm, u_pmds, PREALLOCATED_USER_PMDS) != 0)
443 if (paravirt_pgd_alloc(mm) != 0)
444 goto out_free_user_pmds;
447 * Make sure that pre-populating the pmds is atomic with
448 * respect to anything walking the pgd_list, so that they
449 * never see a partially populated pgd.
451 spin_lock(&pgd_lock);
454 pgd_prepopulate_pmd(mm, pgd, pmds);
455 pgd_prepopulate_user_pmd(mm, pgd, u_pmds);
457 spin_unlock(&pgd_lock);
462 free_pmds(mm, u_pmds, PREALLOCATED_USER_PMDS);
464 free_pmds(mm, pmds, PREALLOCATED_PMDS);
471 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
473 pgd_mop_up_pmds(mm, pgd);
475 paravirt_pgd_free(mm, pgd);
480 * Used to set accessed or dirty bits in the page table entries
481 * on other architectures. On x86, the accessed and dirty bits
482 * are tracked by hardware. However, do_wp_page calls this function
483 * to also make the pte writeable at the same time the dirty bit is
484 * set. In that case we do actually need to write the PTE.
486 int ptep_set_access_flags(struct vm_area_struct *vma,
487 unsigned long address, pte_t *ptep,
488 pte_t entry, int dirty)
490 int changed = !pte_same(*ptep, entry);
492 if (changed && dirty)
493 set_pte(ptep, entry);
498 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
499 int pmdp_set_access_flags(struct vm_area_struct *vma,
500 unsigned long address, pmd_t *pmdp,
501 pmd_t entry, int dirty)
503 int changed = !pmd_same(*pmdp, entry);
505 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
507 if (changed && dirty) {
508 set_pmd(pmdp, entry);
510 * We had a write-protection fault here and changed the pmd
511 * to to more permissive. No need to flush the TLB for that,
512 * #PF is architecturally guaranteed to do that and in the
513 * worst-case we'll generate a spurious fault.
520 int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
521 pud_t *pudp, pud_t entry, int dirty)
523 int changed = !pud_same(*pudp, entry);
525 VM_BUG_ON(address & ~HPAGE_PUD_MASK);
527 if (changed && dirty) {
528 set_pud(pudp, entry);
530 * We had a write-protection fault here and changed the pud
531 * to to more permissive. No need to flush the TLB for that,
532 * #PF is architecturally guaranteed to do that and in the
533 * worst-case we'll generate a spurious fault.
541 int ptep_test_and_clear_young(struct vm_area_struct *vma,
542 unsigned long addr, pte_t *ptep)
546 if (pte_young(*ptep))
547 ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
548 (unsigned long *) &ptep->pte);
553 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
554 int pmdp_test_and_clear_young(struct vm_area_struct *vma,
555 unsigned long addr, pmd_t *pmdp)
559 if (pmd_young(*pmdp))
560 ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
561 (unsigned long *)pmdp);
565 int pudp_test_and_clear_young(struct vm_area_struct *vma,
566 unsigned long addr, pud_t *pudp)
570 if (pud_young(*pudp))
571 ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
572 (unsigned long *)pudp);
578 int ptep_clear_flush_young(struct vm_area_struct *vma,
579 unsigned long address, pte_t *ptep)
582 * On x86 CPUs, clearing the accessed bit without a TLB flush
583 * doesn't cause data corruption. [ It could cause incorrect
584 * page aging and the (mistaken) reclaim of hot pages, but the
585 * chance of that should be relatively low. ]
587 * So as a performance optimization don't flush the TLB when
588 * clearing the accessed bit, it will eventually be flushed by
589 * a context switch or a VM operation anyway. [ In the rare
590 * event of it not getting flushed for a long time the delay
591 * shouldn't really matter because there's no real memory
592 * pressure for swapout to react to. ]
594 return ptep_test_and_clear_young(vma, address, ptep);
597 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
598 int pmdp_clear_flush_young(struct vm_area_struct *vma,
599 unsigned long address, pmd_t *pmdp)
603 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
605 young = pmdp_test_and_clear_young(vma, address, pmdp);
607 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
614 * reserve_top_address - reserves a hole in the top of kernel address space
615 * @reserve - size of hole to reserve
617 * Can be used to relocate the fixmap area and poke a hole in the top
618 * of kernel address space to make room for a hypervisor.
620 void __init reserve_top_address(unsigned long reserve)
623 BUG_ON(fixmaps_set > 0);
624 __FIXADDR_TOP = round_down(-reserve, 1 << PMD_SHIFT) - PAGE_SIZE;
625 printk(KERN_INFO "Reserving virtual address space above 0x%08lx (rounded to 0x%08lx)\n",
626 -reserve, __FIXADDR_TOP + PAGE_SIZE);
632 void __native_set_fixmap(enum fixed_addresses idx, pte_t pte)
634 unsigned long address = __fix_to_virt(idx);
638 * Ensure that the static initial page tables are covering the
641 BUILD_BUG_ON(__end_of_permanent_fixed_addresses >
642 (FIXMAP_PMD_NUM * PTRS_PER_PTE));
645 if (idx >= __end_of_fixed_addresses) {
649 set_pte_vaddr(address, pte);
653 void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
654 phys_addr_t phys, pgprot_t flags)
656 /* Sanitize 'prot' against any unsupported bits: */
657 pgprot_val(flags) &= __default_kernel_pte_mask;
659 __native_set_fixmap(idx, pfn_pte(phys >> PAGE_SHIFT, flags));
662 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
663 #ifdef CONFIG_X86_5LEVEL
665 * p4d_set_huge - setup kernel P4D mapping
667 * No 512GB pages yet -- always return 0
669 int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
675 * p4d_clear_huge - clear kernel P4D mapping when it is set
677 * No 512GB pages yet -- always return 0
679 int p4d_clear_huge(p4d_t *p4d)
686 * pud_set_huge - setup kernel PUD mapping
688 * MTRRs can override PAT memory types with 4KiB granularity. Therefore, this
689 * function sets up a huge page only if any of the following conditions are met:
691 * - MTRRs are disabled, or
693 * - MTRRs are enabled and the range is completely covered by a single MTRR, or
695 * - MTRRs are enabled and the corresponding MTRR memory type is WB, which
696 * has no effect on the requested PAT memory type.
698 * Callers should try to decrease page size (1GB -> 2MB -> 4K) if the bigger
699 * page mapping attempt fails.
701 * Returns 1 on success and 0 on failure.
703 int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
707 mtrr = mtrr_type_lookup(addr, addr + PUD_SIZE, &uniform);
708 if ((mtrr != MTRR_TYPE_INVALID) && (!uniform) &&
709 (mtrr != MTRR_TYPE_WRBACK))
712 /* Bail out if we are we on a populated non-leaf entry: */
713 if (pud_present(*pud) && !pud_huge(*pud))
716 set_pte((pte_t *)pud, pfn_pte(
717 (u64)addr >> PAGE_SHIFT,
718 __pgprot(protval_4k_2_large(pgprot_val(prot)) | _PAGE_PSE)));
724 * pmd_set_huge - setup kernel PMD mapping
726 * See text over pud_set_huge() above.
728 * Returns 1 on success and 0 on failure.
730 int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
734 mtrr = mtrr_type_lookup(addr, addr + PMD_SIZE, &uniform);
735 if ((mtrr != MTRR_TYPE_INVALID) && (!uniform) &&
736 (mtrr != MTRR_TYPE_WRBACK)) {
737 pr_warn_once("%s: Cannot satisfy [mem %#010llx-%#010llx] with a huge-page mapping due to MTRR override.\n",
738 __func__, addr, addr + PMD_SIZE);
742 /* Bail out if we are we on a populated non-leaf entry: */
743 if (pmd_present(*pmd) && !pmd_huge(*pmd))
746 set_pte((pte_t *)pmd, pfn_pte(
747 (u64)addr >> PAGE_SHIFT,
748 __pgprot(protval_4k_2_large(pgprot_val(prot)) | _PAGE_PSE)));
754 * pud_clear_huge - clear kernel PUD mapping when it is set
756 * Returns 1 on success and 0 on failure (no PUD map is found).
758 int pud_clear_huge(pud_t *pud)
760 if (pud_large(*pud)) {
769 * pmd_clear_huge - clear kernel PMD mapping when it is set
771 * Returns 1 on success and 0 on failure (no PMD map is found).
773 int pmd_clear_huge(pmd_t *pmd)
775 if (pmd_large(*pmd)) {
785 * pud_free_pmd_page - Clear pud entry and free pmd page.
786 * @pud: Pointer to a PUD.
787 * @addr: Virtual address associated with pud.
789 * Context: The pud range has been unmapped and TLB purged.
790 * Return: 1 if clearing the entry succeeded. 0 otherwise.
792 * NOTE: Callers must allow a single page allocation.
794 int pud_free_pmd_page(pud_t *pud, unsigned long addr)
800 pmd = pud_pgtable(*pud);
801 pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
805 for (i = 0; i < PTRS_PER_PMD; i++) {
807 if (!pmd_none(pmd[i]))
813 /* INVLPG to clear all paging-structure caches */
814 flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);
816 for (i = 0; i < PTRS_PER_PMD; i++) {
817 if (!pmd_none(pmd_sv[i])) {
818 pte = (pte_t *)pmd_page_vaddr(pmd_sv[i]);
819 free_page((unsigned long)pte);
823 free_page((unsigned long)pmd_sv);
825 pgtable_pmd_page_dtor(virt_to_page(pmd));
826 free_page((unsigned long)pmd);
832 * pmd_free_pte_page - Clear pmd entry and free pte page.
833 * @pmd: Pointer to a PMD.
834 * @addr: Virtual address associated with pmd.
836 * Context: The pmd range has been unmapped and TLB purged.
837 * Return: 1 if clearing the entry succeeded. 0 otherwise.
839 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
843 pte = (pte_t *)pmd_page_vaddr(*pmd);
846 /* INVLPG to clear all paging-structure caches */
847 flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);
849 free_page((unsigned long)pte);
854 #else /* !CONFIG_X86_64 */
857 * Disable free page handling on x86-PAE. This assures that ioremap()
858 * does not update sync'd pmd entries. See vmalloc_sync_one().
860 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
862 return pmd_none(*pmd);
865 #endif /* CONFIG_X86_64 */
866 #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */