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 | |