1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_PGALLLC_TRACK_H 3 #define _LINUX_PGALLLC_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_PGALLLC_TRACK_H */ 52