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