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 */
52
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