LXR linux/mm/pgalloc-track.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_PGALLOC_TRACK_H
   3#define _LINUX_PGALLOC_TRACK_H
   4
   5#if defined(CONFIG_MMU)
   6static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
   7                                     unsigned long address,
   8                                     pgtbl_mod_mask *mod_mask)
   9{
  10        if (unlikely(pgd_none(*pgd))) {
  11                if (__p4d_alloc(mm, pgd, address))
  12                        return NULL;
  13                *mod_mask |= PGTBL_PGD_MODIFIED;
  14        }
  15
  16        return p4d_offset(pgd, address);
  17}
  18
  19static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
  20                                     unsigned long address,
  21                                     pgtbl_mod_mask *mod_mask)
  22{
  23        if (unlikely(p4d_none(*p4d))) {
  24                if (__pud_alloc(mm, p4d, address))
  25                        return NULL;
  26                *mod_mask |= PGTBL_P4D_MODIFIED;
  27        }
  28
  29        return pud_offset(p4d, address);
  30}
  31
  32static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
  33                                     unsigned long address,
  34                                     pgtbl_mod_mask *mod_mask)
  35{
  36        if (unlikely(pud_none(*pud))) {
  37                if (__pmd_alloc(mm, pud, address))
  38                        return NULL;
  39                *mod_mask |= PGTBL_PUD_MODIFIED;
  40        }
  41
  42        return pmd_offset(pud, address);
  43}
  44#endif /* CONFIG_MMU */
  45
  46#define pte_alloc_kernel_track(pmd, address, mask)                      \
  47        ((unlikely(pmd_none(*(pmd))) &&                                 \
  48          (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
  49                NULL: pte_offset_kernel(pmd, address))
  50
  51#endif /* _LINUX_PGALLOC_TRACK_H */
  52