1107 строки
31 KiB
C
1107 строки
31 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This kernel test validates architecture page table helpers and
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* accessors and helps in verifying their continued compliance with
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* expected generic MM semantics.
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*
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* Copyright (C) 2019 ARM Ltd.
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*
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* Author: Anshuman Khandual <anshuman.khandual@arm.com>
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*/
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#define pr_fmt(fmt) "debug_vm_pgtable: [%-25s]: " fmt, __func__
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#include <linux/gfp.h>
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#include <linux/highmem.h>
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#include <linux/hugetlb.h>
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#include <linux/kernel.h>
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#include <linux/kconfig.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/mm_types.h>
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#include <linux/module.h>
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#include <linux/pfn_t.h>
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#include <linux/printk.h>
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#include <linux/pgtable.h>
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#include <linux/random.h>
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#include <linux/spinlock.h>
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#include <linux/swap.h>
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#include <linux/swapops.h>
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#include <linux/start_kernel.h>
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#include <linux/sched/mm.h>
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#include <linux/io.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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/*
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* Please refer Documentation/vm/arch_pgtable_helpers.rst for the semantics
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* expectations that are being validated here. All future changes in here
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* or the documentation need to be in sync.
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*/
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#define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC)
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/*
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* On s390 platform, the lower 4 bits are used to identify given page table
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* entry type. But these bits might affect the ability to clear entries with
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* pxx_clear() because of how dynamic page table folding works on s390. So
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* while loading up the entries do not change the lower 4 bits. It does not
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* have affect any other platform. Also avoid the 62nd bit on ppc64 that is
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* used to mark a pte entry.
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*/
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#define S390_SKIP_MASK GENMASK(3, 0)
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#if __BITS_PER_LONG == 64
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#define PPC64_SKIP_MASK GENMASK(62, 62)
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#else
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#define PPC64_SKIP_MASK 0x0
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#endif
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#define ARCH_SKIP_MASK (S390_SKIP_MASK | PPC64_SKIP_MASK)
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#define RANDOM_ORVALUE (GENMASK(BITS_PER_LONG - 1, 0) & ~ARCH_SKIP_MASK)
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#define RANDOM_NZVALUE GENMASK(7, 0)
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static void __init pte_basic_tests(unsigned long pfn, int idx)
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{
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pgprot_t prot = protection_map[idx];
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pte_t pte = pfn_pte(pfn, prot);
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unsigned long val = idx, *ptr = &val;
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pr_debug("Validating PTE basic (%pGv)\n", ptr);
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/*
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* This test needs to be executed after the given page table entry
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* is created with pfn_pte() to make sure that protection_map[idx]
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* does not have the dirty bit enabled from the beginning. This is
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* important for platforms like arm64 where (!PTE_RDONLY) indicate
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* dirty bit being set.
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*/
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WARN_ON(pte_dirty(pte_wrprotect(pte)));
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WARN_ON(!pte_same(pte, pte));
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WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte))));
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WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte))));
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WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte))));
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WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte))));
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WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte))));
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WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte))));
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WARN_ON(pte_dirty(pte_wrprotect(pte_mkclean(pte))));
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WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte))));
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}
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static void __init pte_advanced_tests(struct mm_struct *mm,
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struct vm_area_struct *vma, pte_t *ptep,
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unsigned long pfn, unsigned long vaddr,
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pgprot_t prot)
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{
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pte_t pte = pfn_pte(pfn, prot);
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/*
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* Architectures optimize set_pte_at by avoiding TLB flush.
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* This requires set_pte_at to be not used to update an
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* existing pte entry. Clear pte before we do set_pte_at
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*/
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pr_debug("Validating PTE advanced\n");
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pte = pfn_pte(pfn, prot);
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set_pte_at(mm, vaddr, ptep, pte);
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ptep_set_wrprotect(mm, vaddr, ptep);
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pte = ptep_get(ptep);
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WARN_ON(pte_write(pte));
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ptep_get_and_clear(mm, vaddr, ptep);
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pte = ptep_get(ptep);
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WARN_ON(!pte_none(pte));
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pte = pfn_pte(pfn, prot);
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pte = pte_wrprotect(pte);
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pte = pte_mkclean(pte);
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set_pte_at(mm, vaddr, ptep, pte);
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pte = pte_mkwrite(pte);
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pte = pte_mkdirty(pte);
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ptep_set_access_flags(vma, vaddr, ptep, pte, 1);
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pte = ptep_get(ptep);
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WARN_ON(!(pte_write(pte) && pte_dirty(pte)));
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ptep_get_and_clear_full(mm, vaddr, ptep, 1);
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pte = ptep_get(ptep);
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WARN_ON(!pte_none(pte));
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pte = pfn_pte(pfn, prot);
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pte = pte_mkyoung(pte);
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set_pte_at(mm, vaddr, ptep, pte);
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ptep_test_and_clear_young(vma, vaddr, ptep);
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pte = ptep_get(ptep);
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WARN_ON(pte_young(pte));
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}
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static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot)
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{
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pte_t pte = pfn_pte(pfn, prot);
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if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
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return;
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pr_debug("Validating PTE saved write\n");
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WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte))));
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WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte))));
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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static void __init pmd_basic_tests(unsigned long pfn, int idx)
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{
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pgprot_t prot = protection_map[idx];
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pmd_t pmd = pfn_pmd(pfn, prot);
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unsigned long val = idx, *ptr = &val;
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if (!has_transparent_hugepage())
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return;
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pr_debug("Validating PMD basic (%pGv)\n", ptr);
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/*
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* This test needs to be executed after the given page table entry
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* is created with pfn_pmd() to make sure that protection_map[idx]
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* does not have the dirty bit enabled from the beginning. This is
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* important for platforms like arm64 where (!PTE_RDONLY) indicate
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* dirty bit being set.
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*/
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WARN_ON(pmd_dirty(pmd_wrprotect(pmd)));
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WARN_ON(!pmd_same(pmd, pmd));
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WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd))));
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WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd))));
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WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd))));
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WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd))));
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WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd))));
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WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd))));
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WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd))));
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WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd))));
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/*
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* A huge page does not point to next level page table
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* entry. Hence this must qualify as pmd_bad().
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*/
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WARN_ON(!pmd_bad(pmd_mkhuge(pmd)));
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}
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static void __init pmd_advanced_tests(struct mm_struct *mm,
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struct vm_area_struct *vma, pmd_t *pmdp,
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unsigned long pfn, unsigned long vaddr,
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pgprot_t prot, pgtable_t pgtable)
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{
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pmd_t pmd = pfn_pmd(pfn, prot);
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if (!has_transparent_hugepage())
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return;
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pr_debug("Validating PMD advanced\n");
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/* Align the address wrt HPAGE_PMD_SIZE */
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vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE;
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pgtable_trans_huge_deposit(mm, pmdp, pgtable);
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pmd = pfn_pmd(pfn, prot);
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set_pmd_at(mm, vaddr, pmdp, pmd);
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pmdp_set_wrprotect(mm, vaddr, pmdp);
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pmd = READ_ONCE(*pmdp);
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WARN_ON(pmd_write(pmd));
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pmdp_huge_get_and_clear(mm, vaddr, pmdp);
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pmd = READ_ONCE(*pmdp);
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WARN_ON(!pmd_none(pmd));
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pmd = pfn_pmd(pfn, prot);
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pmd = pmd_wrprotect(pmd);
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pmd = pmd_mkclean(pmd);
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set_pmd_at(mm, vaddr, pmdp, pmd);
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pmd = pmd_mkwrite(pmd);
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pmd = pmd_mkdirty(pmd);
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pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1);
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pmd = READ_ONCE(*pmdp);
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WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd)));
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pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1);
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pmd = READ_ONCE(*pmdp);
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WARN_ON(!pmd_none(pmd));
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pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
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pmd = pmd_mkyoung(pmd);
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set_pmd_at(mm, vaddr, pmdp, pmd);
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pmdp_test_and_clear_young(vma, vaddr, pmdp);
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pmd = READ_ONCE(*pmdp);
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WARN_ON(pmd_young(pmd));
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/* Clear the pte entries */
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pmdp_huge_get_and_clear(mm, vaddr, pmdp);
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pgtable = pgtable_trans_huge_withdraw(mm, pmdp);
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}
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static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot)
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{
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pmd_t pmd = pfn_pmd(pfn, prot);
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pr_debug("Validating PMD leaf\n");
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/*
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* PMD based THP is a leaf entry.
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*/
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pmd = pmd_mkhuge(pmd);
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WARN_ON(!pmd_leaf(pmd));
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}
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
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static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
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{
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pmd_t pmd;
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if (!arch_vmap_pmd_supported(prot))
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return;
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pr_debug("Validating PMD huge\n");
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/*
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* X86 defined pmd_set_huge() verifies that the given
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* PMD is not a populated non-leaf entry.
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*/
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WRITE_ONCE(*pmdp, __pmd(0));
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WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot));
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WARN_ON(!pmd_clear_huge(pmdp));
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pmd = READ_ONCE(*pmdp);
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WARN_ON(!pmd_none(pmd));
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}
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#else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
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static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { }
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#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
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static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
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{
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pmd_t pmd = pfn_pmd(pfn, prot);
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if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
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return;
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pr_debug("Validating PMD saved write\n");
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WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd))));
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WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd))));
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}
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx)
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{
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pgprot_t prot = protection_map[idx];
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pud_t pud = pfn_pud(pfn, prot);
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unsigned long val = idx, *ptr = &val;
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if (!has_transparent_hugepage())
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return;
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pr_debug("Validating PUD basic (%pGv)\n", ptr);
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/*
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* This test needs to be executed after the given page table entry
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* is created with pfn_pud() to make sure that protection_map[idx]
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* does not have the dirty bit enabled from the beginning. This is
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* important for platforms like arm64 where (!PTE_RDONLY) indicate
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* dirty bit being set.
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*/
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WARN_ON(pud_dirty(pud_wrprotect(pud)));
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WARN_ON(!pud_same(pud, pud));
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WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud))));
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WARN_ON(!pud_dirty(pud_mkdirty(pud_mkclean(pud))));
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WARN_ON(pud_dirty(pud_mkclean(pud_mkdirty(pud))));
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WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud))));
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WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud))));
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WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud))));
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WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud))));
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WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud))));
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if (mm_pmd_folded(mm))
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return;
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/*
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* A huge page does not point to next level page table
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* entry. Hence this must qualify as pud_bad().
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*/
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WARN_ON(!pud_bad(pud_mkhuge(pud)));
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}
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static void __init pud_advanced_tests(struct mm_struct *mm,
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struct vm_area_struct *vma, pud_t *pudp,
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unsigned long pfn, unsigned long vaddr,
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pgprot_t prot)
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{
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pud_t pud = pfn_pud(pfn, prot);
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if (!has_transparent_hugepage())
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return;
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pr_debug("Validating PUD advanced\n");
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/* Align the address wrt HPAGE_PUD_SIZE */
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vaddr = (vaddr & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE;
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set_pud_at(mm, vaddr, pudp, pud);
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pudp_set_wrprotect(mm, vaddr, pudp);
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pud = READ_ONCE(*pudp);
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WARN_ON(pud_write(pud));
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#ifndef __PAGETABLE_PMD_FOLDED
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pudp_huge_get_and_clear(mm, vaddr, pudp);
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pud = READ_ONCE(*pudp);
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WARN_ON(!pud_none(pud));
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#endif /* __PAGETABLE_PMD_FOLDED */
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pud = pfn_pud(pfn, prot);
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pud = pud_wrprotect(pud);
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pud = pud_mkclean(pud);
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set_pud_at(mm, vaddr, pudp, pud);
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pud = pud_mkwrite(pud);
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pud = pud_mkdirty(pud);
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pudp_set_access_flags(vma, vaddr, pudp, pud, 1);
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pud = READ_ONCE(*pudp);
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WARN_ON(!(pud_write(pud) && pud_dirty(pud)));
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#ifndef __PAGETABLE_PMD_FOLDED
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pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1);
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pud = READ_ONCE(*pudp);
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WARN_ON(!pud_none(pud));
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#endif /* __PAGETABLE_PMD_FOLDED */
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pud = pfn_pud(pfn, prot);
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pud = pud_mkyoung(pud);
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set_pud_at(mm, vaddr, pudp, pud);
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pudp_test_and_clear_young(vma, vaddr, pudp);
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pud = READ_ONCE(*pudp);
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WARN_ON(pud_young(pud));
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pudp_huge_get_and_clear(mm, vaddr, pudp);
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}
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static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot)
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{
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pud_t pud = pfn_pud(pfn, prot);
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pr_debug("Validating PUD leaf\n");
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/*
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* PUD based THP is a leaf entry.
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*/
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pud = pud_mkhuge(pud);
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WARN_ON(!pud_leaf(pud));
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}
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
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static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
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{
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pud_t pud;
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if (!arch_vmap_pud_supported(prot))
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return;
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pr_debug("Validating PUD huge\n");
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/*
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* X86 defined pud_set_huge() verifies that the given
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* PUD is not a populated non-leaf entry.
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*/
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WRITE_ONCE(*pudp, __pud(0));
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WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot));
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WARN_ON(!pud_clear_huge(pudp));
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pud = READ_ONCE(*pudp);
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WARN_ON(!pud_none(pud));
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}
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#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
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static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { }
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#endif /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
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#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
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static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { }
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static void __init pud_advanced_tests(struct mm_struct *mm,
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struct vm_area_struct *vma, pud_t *pudp,
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unsigned long pfn, unsigned long vaddr,
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pgprot_t prot)
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{
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}
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static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
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static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
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{
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}
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#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
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#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
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static void __init pmd_basic_tests(unsigned long pfn, int idx) { }
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static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { }
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static void __init pmd_advanced_tests(struct mm_struct *mm,
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struct vm_area_struct *vma, pmd_t *pmdp,
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unsigned long pfn, unsigned long vaddr,
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pgprot_t prot, pgtable_t pgtable)
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{
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}
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static void __init pud_advanced_tests(struct mm_struct *mm,
|
|
struct vm_area_struct *vma, pud_t *pudp,
|
|
unsigned long pfn, unsigned long vaddr,
|
|
pgprot_t prot)
|
|
{
|
|
}
|
|
static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
|
|
{
|
|
}
|
|
static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
|
|
{
|
|
}
|
|
static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
p4d_t p4d;
|
|
|
|
pr_debug("Validating P4D basic\n");
|
|
memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t));
|
|
WARN_ON(!p4d_same(p4d, p4d));
|
|
}
|
|
|
|
static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pgd_t pgd;
|
|
|
|
pr_debug("Validating PGD basic\n");
|
|
memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t));
|
|
WARN_ON(!pgd_same(pgd, pgd));
|
|
}
|
|
|
|
#ifndef __PAGETABLE_PUD_FOLDED
|
|
static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp)
|
|
{
|
|
pud_t pud = READ_ONCE(*pudp);
|
|
|
|
if (mm_pmd_folded(mm))
|
|
return;
|
|
|
|
pr_debug("Validating PUD clear\n");
|
|
pud = __pud(pud_val(pud) | RANDOM_ORVALUE);
|
|
WRITE_ONCE(*pudp, pud);
|
|
pud_clear(pudp);
|
|
pud = READ_ONCE(*pudp);
|
|
WARN_ON(!pud_none(pud));
|
|
}
|
|
|
|
static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp,
|
|
pmd_t *pmdp)
|
|
{
|
|
pud_t pud;
|
|
|
|
if (mm_pmd_folded(mm))
|
|
return;
|
|
|
|
pr_debug("Validating PUD populate\n");
|
|
/*
|
|
* This entry points to next level page table page.
|
|
* Hence this must not qualify as pud_bad().
|
|
*/
|
|
pud_populate(mm, pudp, pmdp);
|
|
pud = READ_ONCE(*pudp);
|
|
WARN_ON(pud_bad(pud));
|
|
}
|
|
#else /* !__PAGETABLE_PUD_FOLDED */
|
|
static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { }
|
|
static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp,
|
|
pmd_t *pmdp)
|
|
{
|
|
}
|
|
#endif /* PAGETABLE_PUD_FOLDED */
|
|
|
|
#ifndef __PAGETABLE_P4D_FOLDED
|
|
static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp)
|
|
{
|
|
p4d_t p4d = READ_ONCE(*p4dp);
|
|
|
|
if (mm_pud_folded(mm))
|
|
return;
|
|
|
|
pr_debug("Validating P4D clear\n");
|
|
p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE);
|
|
WRITE_ONCE(*p4dp, p4d);
|
|
p4d_clear(p4dp);
|
|
p4d = READ_ONCE(*p4dp);
|
|
WARN_ON(!p4d_none(p4d));
|
|
}
|
|
|
|
static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
|
|
pud_t *pudp)
|
|
{
|
|
p4d_t p4d;
|
|
|
|
if (mm_pud_folded(mm))
|
|
return;
|
|
|
|
pr_debug("Validating P4D populate\n");
|
|
/*
|
|
* This entry points to next level page table page.
|
|
* Hence this must not qualify as p4d_bad().
|
|
*/
|
|
pud_clear(pudp);
|
|
p4d_clear(p4dp);
|
|
p4d_populate(mm, p4dp, pudp);
|
|
p4d = READ_ONCE(*p4dp);
|
|
WARN_ON(p4d_bad(p4d));
|
|
}
|
|
|
|
static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp)
|
|
{
|
|
pgd_t pgd = READ_ONCE(*pgdp);
|
|
|
|
if (mm_p4d_folded(mm))
|
|
return;
|
|
|
|
pr_debug("Validating PGD clear\n");
|
|
pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE);
|
|
WRITE_ONCE(*pgdp, pgd);
|
|
pgd_clear(pgdp);
|
|
pgd = READ_ONCE(*pgdp);
|
|
WARN_ON(!pgd_none(pgd));
|
|
}
|
|
|
|
static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
|
|
p4d_t *p4dp)
|
|
{
|
|
pgd_t pgd;
|
|
|
|
if (mm_p4d_folded(mm))
|
|
return;
|
|
|
|
pr_debug("Validating PGD populate\n");
|
|
/*
|
|
* This entry points to next level page table page.
|
|
* Hence this must not qualify as pgd_bad().
|
|
*/
|
|
p4d_clear(p4dp);
|
|
pgd_clear(pgdp);
|
|
pgd_populate(mm, pgdp, p4dp);
|
|
pgd = READ_ONCE(*pgdp);
|
|
WARN_ON(pgd_bad(pgd));
|
|
}
|
|
#else /* !__PAGETABLE_P4D_FOLDED */
|
|
static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { }
|
|
static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { }
|
|
static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
|
|
pud_t *pudp)
|
|
{
|
|
}
|
|
static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
|
|
p4d_t *p4dp)
|
|
{
|
|
}
|
|
#endif /* PAGETABLE_P4D_FOLDED */
|
|
|
|
static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep,
|
|
unsigned long pfn, unsigned long vaddr,
|
|
pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
pr_debug("Validating PTE clear\n");
|
|
#ifndef CONFIG_RISCV
|
|
pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
|
|
#endif
|
|
set_pte_at(mm, vaddr, ptep, pte);
|
|
barrier();
|
|
pte_clear(mm, vaddr, ptep);
|
|
pte = ptep_get(ptep);
|
|
WARN_ON(!pte_none(pte));
|
|
}
|
|
|
|
static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp)
|
|
{
|
|
pmd_t pmd = READ_ONCE(*pmdp);
|
|
|
|
pr_debug("Validating PMD clear\n");
|
|
pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE);
|
|
WRITE_ONCE(*pmdp, pmd);
|
|
pmd_clear(pmdp);
|
|
pmd = READ_ONCE(*pmdp);
|
|
WARN_ON(!pmd_none(pmd));
|
|
}
|
|
|
|
static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp,
|
|
pgtable_t pgtable)
|
|
{
|
|
pmd_t pmd;
|
|
|
|
pr_debug("Validating PMD populate\n");
|
|
/*
|
|
* This entry points to next level page table page.
|
|
* Hence this must not qualify as pmd_bad().
|
|
*/
|
|
pmd_populate(mm, pmdp, pgtable);
|
|
pmd = READ_ONCE(*pmdp);
|
|
WARN_ON(pmd_bad(pmd));
|
|
}
|
|
|
|
static void __init pte_special_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL))
|
|
return;
|
|
|
|
pr_debug("Validating PTE special\n");
|
|
WARN_ON(!pte_special(pte_mkspecial(pte)));
|
|
}
|
|
|
|
static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
|
|
return;
|
|
|
|
pr_debug("Validating PTE protnone\n");
|
|
WARN_ON(!pte_protnone(pte));
|
|
WARN_ON(!pte_present(pte));
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pmd_t pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
|
|
|
|
if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
|
|
return;
|
|
|
|
pr_debug("Validating PMD protnone\n");
|
|
WARN_ON(!pmd_protnone(pmd));
|
|
WARN_ON(!pmd_present(pmd));
|
|
}
|
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
|
|
static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
|
|
static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
pr_debug("Validating PTE devmap\n");
|
|
WARN_ON(!pte_devmap(pte_mkdevmap(pte)));
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pmd_t pmd = pfn_pmd(pfn, prot);
|
|
|
|
pr_debug("Validating PMD devmap\n");
|
|
WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd)));
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
|
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pud_t pud = pfn_pud(pfn, prot);
|
|
|
|
pr_debug("Validating PUD devmap\n");
|
|
WARN_ON(!pud_devmap(pud_mkdevmap(pud)));
|
|
}
|
|
#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
|
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
|
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
#else
|
|
static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
|
|
|
|
static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
|
|
return;
|
|
|
|
pr_debug("Validating PTE soft dirty\n");
|
|
WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte)));
|
|
WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte)));
|
|
}
|
|
|
|
static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
|
|
return;
|
|
|
|
pr_debug("Validating PTE swap soft dirty\n");
|
|
WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte)));
|
|
WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte)));
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pmd_t pmd = pfn_pmd(pfn, prot);
|
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
|
|
return;
|
|
|
|
pr_debug("Validating PMD soft dirty\n");
|
|
WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd)));
|
|
WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd)));
|
|
}
|
|
|
|
static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pmd_t pmd = pfn_pmd(pfn, prot);
|
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) ||
|
|
!IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION))
|
|
return;
|
|
|
|
pr_debug("Validating PMD swap soft dirty\n");
|
|
WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd)));
|
|
WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd)));
|
|
}
|
|
#else /* !CONFIG_ARCH_HAS_PTE_DEVMAP */
|
|
static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
}
|
|
#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
|
|
|
|
static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
swp_entry_t swp;
|
|
pte_t pte;
|
|
|
|
pr_debug("Validating PTE swap\n");
|
|
pte = pfn_pte(pfn, prot);
|
|
swp = __pte_to_swp_entry(pte);
|
|
pte = __swp_entry_to_pte(swp);
|
|
WARN_ON(pfn != pte_pfn(pte));
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
|
|
static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
swp_entry_t swp;
|
|
pmd_t pmd;
|
|
|
|
pr_debug("Validating PMD swap\n");
|
|
pmd = pfn_pmd(pfn, prot);
|
|
swp = __pmd_to_swp_entry(pmd);
|
|
pmd = __swp_entry_to_pmd(swp);
|
|
WARN_ON(pfn != pmd_pfn(pmd));
|
|
}
|
|
#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */
|
|
static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
|
|
|
|
static void __init swap_migration_tests(void)
|
|
{
|
|
struct page *page;
|
|
swp_entry_t swp;
|
|
|
|
if (!IS_ENABLED(CONFIG_MIGRATION))
|
|
return;
|
|
|
|
pr_debug("Validating swap migration\n");
|
|
/*
|
|
* swap_migration_tests() requires a dedicated page as it needs to
|
|
* be locked before creating a migration entry from it. Locking the
|
|
* page that actually maps kernel text ('start_kernel') can be real
|
|
* problematic. Lets allocate a dedicated page explicitly for this
|
|
* purpose that will be freed subsequently.
|
|
*/
|
|
page = alloc_page(GFP_KERNEL);
|
|
if (!page) {
|
|
pr_err("page allocation failed\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* make_migration_entry() expects given page to be
|
|
* locked, otherwise it stumbles upon a BUG_ON().
|
|
*/
|
|
__SetPageLocked(page);
|
|
swp = make_migration_entry(page, 1);
|
|
WARN_ON(!is_migration_entry(swp));
|
|
WARN_ON(!is_write_migration_entry(swp));
|
|
|
|
make_migration_entry_read(&swp);
|
|
WARN_ON(!is_migration_entry(swp));
|
|
WARN_ON(is_write_migration_entry(swp));
|
|
|
|
swp = make_migration_entry(page, 0);
|
|
WARN_ON(!is_migration_entry(swp));
|
|
WARN_ON(is_write_migration_entry(swp));
|
|
__ClearPageLocked(page);
|
|
__free_page(page);
|
|
}
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
struct page *page;
|
|
pte_t pte;
|
|
|
|
pr_debug("Validating HugeTLB basic\n");
|
|
/*
|
|
* Accessing the page associated with the pfn is safe here,
|
|
* as it was previously derived from a real kernel symbol.
|
|
*/
|
|
page = pfn_to_page(pfn);
|
|
pte = mk_huge_pte(page, prot);
|
|
|
|
WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte)));
|
|
WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte))));
|
|
WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte))));
|
|
|
|
#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
|
|
pte = pfn_pte(pfn, prot);
|
|
|
|
WARN_ON(!pte_huge(pte_mkhuge(pte)));
|
|
#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
|
|
}
|
|
#else /* !CONFIG_HUGETLB_PAGE */
|
|
static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_HUGETLB_PAGE */
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pmd_t pmd;
|
|
|
|
if (!has_transparent_hugepage())
|
|
return;
|
|
|
|
pr_debug("Validating PMD based THP\n");
|
|
/*
|
|
* pmd_trans_huge() and pmd_present() must return positive after
|
|
* MMU invalidation with pmd_mkinvalid(). This behavior is an
|
|
* optimization for transparent huge page. pmd_trans_huge() must
|
|
* be true if pmd_page() returns a valid THP to avoid taking the
|
|
* pmd_lock when others walk over non transhuge pmds (i.e. there
|
|
* are no THP allocated). Especially when splitting a THP and
|
|
* removing the present bit from the pmd, pmd_trans_huge() still
|
|
* needs to return true. pmd_present() should be true whenever
|
|
* pmd_trans_huge() returns true.
|
|
*/
|
|
pmd = pfn_pmd(pfn, prot);
|
|
WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd)));
|
|
|
|
#ifndef __HAVE_ARCH_PMDP_INVALIDATE
|
|
WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd))));
|
|
WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))));
|
|
#endif /* __HAVE_ARCH_PMDP_INVALIDATE */
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
|
|
static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pud_t pud;
|
|
|
|
if (!has_transparent_hugepage())
|
|
return;
|
|
|
|
pr_debug("Validating PUD based THP\n");
|
|
pud = pfn_pud(pfn, prot);
|
|
WARN_ON(!pud_trans_huge(pud_mkhuge(pud)));
|
|
|
|
/*
|
|
* pud_mkinvalid() has been dropped for now. Enable back
|
|
* these tests when it comes back with a modified pud_present().
|
|
*
|
|
* WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud))));
|
|
* WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud))));
|
|
*/
|
|
}
|
|
#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
|
|
static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
|
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
|
|
static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { }
|
|
static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { }
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
static unsigned long __init get_random_vaddr(void)
|
|
{
|
|
unsigned long random_vaddr, random_pages, total_user_pages;
|
|
|
|
total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE;
|
|
|
|
random_pages = get_random_long() % total_user_pages;
|
|
random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE;
|
|
|
|
return random_vaddr;
|
|
}
|
|
|
|
static int __init debug_vm_pgtable(void)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
struct mm_struct *mm;
|
|
pgd_t *pgdp;
|
|
p4d_t *p4dp, *saved_p4dp;
|
|
pud_t *pudp, *saved_pudp;
|
|
pmd_t *pmdp, *saved_pmdp, pmd;
|
|
pte_t *ptep;
|
|
pgtable_t saved_ptep;
|
|
pgprot_t prot, protnone;
|
|
phys_addr_t paddr;
|
|
unsigned long vaddr, pte_aligned, pmd_aligned;
|
|
unsigned long pud_aligned, p4d_aligned, pgd_aligned;
|
|
spinlock_t *ptl = NULL;
|
|
int idx;
|
|
|
|
pr_info("Validating architecture page table helpers\n");
|
|
prot = vm_get_page_prot(VMFLAGS);
|
|
vaddr = get_random_vaddr();
|
|
mm = mm_alloc();
|
|
if (!mm) {
|
|
pr_err("mm_struct allocation failed\n");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* __P000 (or even __S000) will help create page table entries with
|
|
* PROT_NONE permission as required for pxx_protnone_tests().
|
|
*/
|
|
protnone = __P000;
|
|
|
|
vma = vm_area_alloc(mm);
|
|
if (!vma) {
|
|
pr_err("vma allocation failed\n");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* PFN for mapping at PTE level is determined from a standard kernel
|
|
* text symbol. But pfns for higher page table levels are derived by
|
|
* masking lower bits of this real pfn. These derived pfns might not
|
|
* exist on the platform but that does not really matter as pfn_pxx()
|
|
* helpers will still create appropriate entries for the test. This
|
|
* helps avoid large memory block allocations to be used for mapping
|
|
* at higher page table levels.
|
|
*/
|
|
paddr = __pa_symbol(&start_kernel);
|
|
|
|
pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT;
|
|
pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT;
|
|
pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT;
|
|
p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT;
|
|
pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT;
|
|
WARN_ON(!pfn_valid(pte_aligned));
|
|
|
|
pgdp = pgd_offset(mm, vaddr);
|
|
p4dp = p4d_alloc(mm, pgdp, vaddr);
|
|
pudp = pud_alloc(mm, p4dp, vaddr);
|
|
pmdp = pmd_alloc(mm, pudp, vaddr);
|
|
/*
|
|
* Allocate pgtable_t
|
|
*/
|
|
if (pte_alloc(mm, pmdp)) {
|
|
pr_err("pgtable allocation failed\n");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Save all the page table page addresses as the page table
|
|
* entries will be used for testing with random or garbage
|
|
* values. These saved addresses will be used for freeing
|
|
* page table pages.
|
|
*/
|
|
pmd = READ_ONCE(*pmdp);
|
|
saved_p4dp = p4d_offset(pgdp, 0UL);
|
|
saved_pudp = pud_offset(p4dp, 0UL);
|
|
saved_pmdp = pmd_offset(pudp, 0UL);
|
|
saved_ptep = pmd_pgtable(pmd);
|
|
|
|
/*
|
|
* Iterate over the protection_map[] to make sure that all
|
|
* the basic page table transformation validations just hold
|
|
* true irrespective of the starting protection value for a
|
|
* given page table entry.
|
|
*/
|
|
for (idx = 0; idx < ARRAY_SIZE(protection_map); idx++) {
|
|
pte_basic_tests(pte_aligned, idx);
|
|
pmd_basic_tests(pmd_aligned, idx);
|
|
pud_basic_tests(mm, pud_aligned, idx);
|
|
}
|
|
|
|
/*
|
|
* Both P4D and PGD level tests are very basic which do not
|
|
* involve creating page table entries from the protection
|
|
* value and the given pfn. Hence just keep them out from
|
|
* the above iteration for now to save some test execution
|
|
* time.
|
|
*/
|
|
p4d_basic_tests(p4d_aligned, prot);
|
|
pgd_basic_tests(pgd_aligned, prot);
|
|
|
|
pmd_leaf_tests(pmd_aligned, prot);
|
|
pud_leaf_tests(pud_aligned, prot);
|
|
|
|
pte_savedwrite_tests(pte_aligned, protnone);
|
|
pmd_savedwrite_tests(pmd_aligned, protnone);
|
|
|
|
pte_special_tests(pte_aligned, prot);
|
|
pte_protnone_tests(pte_aligned, protnone);
|
|
pmd_protnone_tests(pmd_aligned, protnone);
|
|
|
|
pte_devmap_tests(pte_aligned, prot);
|
|
pmd_devmap_tests(pmd_aligned, prot);
|
|
pud_devmap_tests(pud_aligned, prot);
|
|
|
|
pte_soft_dirty_tests(pte_aligned, prot);
|
|
pmd_soft_dirty_tests(pmd_aligned, prot);
|
|
pte_swap_soft_dirty_tests(pte_aligned, prot);
|
|
pmd_swap_soft_dirty_tests(pmd_aligned, prot);
|
|
|
|
pte_swap_tests(pte_aligned, prot);
|
|
pmd_swap_tests(pmd_aligned, prot);
|
|
|
|
swap_migration_tests();
|
|
|
|
pmd_thp_tests(pmd_aligned, prot);
|
|
pud_thp_tests(pud_aligned, prot);
|
|
|
|
hugetlb_basic_tests(pte_aligned, prot);
|
|
|
|
/*
|
|
* Page table modifying tests. They need to hold
|
|
* proper page table lock.
|
|
*/
|
|
|
|
ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl);
|
|
pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot);
|
|
pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
|
|
pte_unmap_unlock(ptep, ptl);
|
|
|
|
ptl = pmd_lock(mm, pmdp);
|
|
pmd_clear_tests(mm, pmdp);
|
|
pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep);
|
|
pmd_huge_tests(pmdp, pmd_aligned, prot);
|
|
pmd_populate_tests(mm, pmdp, saved_ptep);
|
|
spin_unlock(ptl);
|
|
|
|
ptl = pud_lock(mm, pudp);
|
|
pud_clear_tests(mm, pudp);
|
|
pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot);
|
|
pud_huge_tests(pudp, pud_aligned, prot);
|
|
pud_populate_tests(mm, pudp, saved_pmdp);
|
|
spin_unlock(ptl);
|
|
|
|
spin_lock(&mm->page_table_lock);
|
|
p4d_clear_tests(mm, p4dp);
|
|
pgd_clear_tests(mm, pgdp);
|
|
p4d_populate_tests(mm, p4dp, saved_pudp);
|
|
pgd_populate_tests(mm, pgdp, saved_p4dp);
|
|
spin_unlock(&mm->page_table_lock);
|
|
|
|
p4d_free(mm, saved_p4dp);
|
|
pud_free(mm, saved_pudp);
|
|
pmd_free(mm, saved_pmdp);
|
|
pte_free(mm, saved_ptep);
|
|
|
|
vm_area_free(vma);
|
|
mm_dec_nr_puds(mm);
|
|
mm_dec_nr_pmds(mm);
|
|
mm_dec_nr_ptes(mm);
|
|
mmdrop(mm);
|
|
return 0;
|
|
}
|
|
late_initcall(debug_vm_pgtable);
|