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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _LINUX_SECRETMEM_H #define _LINUX_SECRETMEM_H #ifdef CONFIG_SECRETMEM extern const struct address_space_operations secretmem_aops; static inline bool folio_is_secretmem(struct folio *folio) { struct address_space *mapping; /* * Using folio_mapping() is quite slow because of the actual call * instruction. * We know that secretmem pages are not compound, so we can * save a couple of cycles here. */ if (folio_test_large(folio)) return false; mapping = (struct address_space *) ((unsigned long)folio->mapping & ~PAGE_MAPPING_FLAGS); if (!mapping || mapping != folio->mapping) return false; return mapping->a_ops == &secretmem_aops; } static inline bool secretmem_mapping(struct address_space *mapping) { return mapping->a_ops == &secretmem_aops; } bool vma_is_secretmem(struct vm_area_struct *vma); bool secretmem_active(void); #else static inline bool vma_is_secretmem(struct vm_area_struct *vma) { return false; } static inline bool folio_is_secretmem(struct folio *folio) { return false; } static inline bool secretmem_mapping(struct address_space *mapping) { return false; } static inline bool secretmem_active(void) { return false; } #endif /* CONFIG_SECRETMEM */ #endif /* _LINUX_SECRETMEM_H */
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