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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)
p4d_alloc_track(struct mm_struct * mm,pgd_t * pgd,unsigned long address,pgtbl_mod_mask * mod_mask)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 
pud_alloc_track(struct mm_struct * mm,p4d_t * p4d,unsigned long address,pgtbl_mod_mask * mod_mask)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 
pmd_alloc_track(struct mm_struct * mm,pud_t * pud,unsigned long address,pgtbl_mod_mask * mod_mask)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