52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PGALLOC_TRACK_H
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#define _LINUX_PGALLOC_TRACK_H
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#if defined(CONFIG_MMU)
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static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
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unsigned long address,
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pgtbl_mod_mask *mod_mask)
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{
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if (unlikely(pgd_none(*pgd))) {
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if (__p4d_alloc(mm, pgd, address))
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return NULL;
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*mod_mask |= PGTBL_PGD_MODIFIED;
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}
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return p4d_offset(pgd, address);
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}
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static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
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unsigned long address,
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pgtbl_mod_mask *mod_mask)
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{
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if (unlikely(p4d_none(*p4d))) {
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if (__pud_alloc(mm, p4d, address))
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return NULL;
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*mod_mask |= PGTBL_P4D_MODIFIED;
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}
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return pud_offset(p4d, address);
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}
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static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
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unsigned long address,
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pgtbl_mod_mask *mod_mask)
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{
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if (unlikely(pud_none(*pud))) {
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if (__pmd_alloc(mm, pud, address))
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return NULL;
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*mod_mask |= PGTBL_PUD_MODIFIED;
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}
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return pmd_offset(pud, address);
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}
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#endif /* CONFIG_MMU */
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#define pte_alloc_kernel_track(pmd, address, mask) \
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((unlikely(pmd_none(*(pmd))) && \
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(__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
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NULL: pte_offset_kernel(pmd, address))
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#endif /* _LINUX_PGALLOC_TRACK_H */
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