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)
   6 static 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
  19 static 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
  32 static 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 */