linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  mm/mremap.c

 *

 *  (C) Copyright 1996 Linus Torvalds

 *

 *  Address space accounting code   <alan@lxorguk.ukuu.org.uk>

 *  (C) Copyright 2002 Red Hat Inc, All Rights Reserved

 */

​

#include <linux/mm.h>

#include <linux/hugetlb.h>

#include <linux/shm.h>

#include <linux/ksm.h>

#include <linux/mman.h>

#include <linux/swap.h>

#include <linux/capability.h>

#include <linux/fs.h>

#include <linux/swapops.h>

#include <linux/highmem.h>

#include <linux/security.h>

#include <linux/syscalls.h>

#include <linux/mmu_notifier.h>

#include <linux/uaccess.h>

#include <linux/mm-arch-hooks.h>

#include <linux/userfaultfd_k.h>

​

#include <asm/cacheflush.h>

#include <asm/tlbflush.h>

​

#include "internal.h"

​

static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr)

{

    pgd_t *pgd;

    p4d_t *p4d;

    pud_t *pud;

    pmd_t *pmd;

​

    pgd = pgd_offset(mm, addr);

    if (pgd_none_or_clear_bad(pgd))

        return NULL;

​

    p4d = p4d_offset(pgd, addr);

    if (p4d_none_or_clear_bad(p4d))

        return NULL;

​

    pud = pud_offset(p4d, addr);

    if (pud_none_or_clear_bad(pud))

        return NULL;

​

    pmd = pmd_offset(pud, addr);

    if (pmd_none(*pmd))

        return NULL;

​

    return pmd;

}

​

static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma,

                unsigned long addr)

{

    pgd_t *pgd;

    p4d_t *p4d;