1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PGALLOC_TRACK_H
3 #define _LINUX_PGALLOC_TRACK_H
4
5 #include <linux/mm.h>
6 #include <linux/pgtable.h>
7
8 #if defined(CONFIG_MMU)
p4d_alloc_track(struct mm_struct * mm,pgd_t * pgd,unsigned long address,pgtbl_mod_mask * mod_mask)9 static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
10 unsigned long address,
11 pgtbl_mod_mask *mod_mask)
12 {
13 if (unlikely(pgd_none(*pgd))) {
14 if (__p4d_alloc(mm, pgd, address))
15 return NULL;
16 *mod_mask |= PGTBL_PGD_MODIFIED;
17 }
18
19 return p4d_offset(pgd, address);
20 }
21
pud_alloc_track(struct mm_struct * mm,p4d_t * p4d,unsigned long address,pgtbl_mod_mask * mod_mask)22 static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
23 unsigned long address,
24 pgtbl_mod_mask *mod_mask)
25 {
26 if (unlikely(p4d_none(*p4d))) {
27 if (__pud_alloc(mm, p4d, address))
28 return NULL;
29 *mod_mask |= PGTBL_P4D_MODIFIED;
30 }
31
32 return pud_offset(p4d, address);
33 }
34
pmd_alloc_track(struct mm_struct * mm,pud_t * pud,unsigned long address,pgtbl_mod_mask * mod_mask)35 static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
36 unsigned long address,
37 pgtbl_mod_mask *mod_mask)
38 {
39 if (unlikely(pud_none(*pud))) {
40 if (__pmd_alloc(mm, pud, address))
41 return NULL;
42 *mod_mask |= PGTBL_PUD_MODIFIED;
43 }
44
45 return pmd_offset(pud, address);
46 }
47 #endif /* CONFIG_MMU */
48
49 #define pte_alloc_kernel_track(pmd, address, mask) \
50 ((unlikely(pmd_none(*(pmd))) && \
51 (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
52 NULL: pte_offset_kernel(pmd, address))
53
54 #endif /* _LINUX_PGALLOC_TRACK_H */
55