/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PGALLOC_TRACK_H
#define _LINUX_PGALLOC_TRACK_H

#if defined(CONFIG_MMU)
static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
                                     unsigned long address,
                                     pgtbl_mod_mask *mod_mask)
{
        if (unlikely(pgd_none(*pgd))) {
                if (__p4d_alloc(mm, pgd, address))
                        return NULL;
                *mod_mask |= PGTBL_PGD_MODIFIED;
        }

        return p4d_offset(pgd, address);
}

static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
                                     unsigned long address,
                                     pgtbl_mod_mask *mod_mask)
{
        if (unlikely(p4d_none(*p4d))) {
                if (__pud_alloc(mm, p4d, address))
                        return NULL;
                *mod_mask |= PGTBL_P4D_MODIFIED;
        }

        return pud_offset(p4d, address);
}

static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
                                     unsigned long address,
                                     pgtbl_mod_mask *mod_mask)
{
        if (unlikely(pud_none(*pud))) {
                if (__pmd_alloc(mm, pud, address))
                        return NULL;
                *mod_mask |= PGTBL_PUD_MODIFIED;
        }

        return pmd_offset(pud, address);
}
#endif /* CONFIG_MMU */

#define pte_alloc_kernel_track(pmd, address, mask)                      \
        ((unlikely(pmd_none(*(pmd))) &&                                 \
          (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
                NULL: pte_offset_kernel(pmd, address))

#endif /* _LINUX_PGALLOC_TRACK_H */