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8f9ff2deb8
The only caller already has a folio, so use it to save calling compound_head() in PageLRU() and remove a use of page->mapping. Link: https://lkml.kernel.org/r/20230822202335.179081-1-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _LINUX_SECRETMEM_H
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#define _LINUX_SECRETMEM_H
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#ifdef CONFIG_SECRETMEM
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extern const struct address_space_operations secretmem_aops;
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static inline bool folio_is_secretmem(struct folio *folio)
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{
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struct address_space *mapping;
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/*
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* Using folio_mapping() is quite slow because of the actual call
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* instruction.
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* We know that secretmem pages are not compound and LRU so we can
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* save a couple of cycles here.
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*/
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if (folio_test_large(folio) || !folio_test_lru(folio))
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return false;
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mapping = (struct address_space *)
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((unsigned long)folio->mapping & ~PAGE_MAPPING_FLAGS);
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if (!mapping || mapping != folio->mapping)
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return false;
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return mapping->a_ops == &secretmem_aops;
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}
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bool vma_is_secretmem(struct vm_area_struct *vma);
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bool secretmem_active(void);
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#else
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static inline bool vma_is_secretmem(struct vm_area_struct *vma)
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{
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return false;
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}
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static inline bool folio_is_secretmem(struct folio *folio)
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{
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return false;
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}
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static inline bool secretmem_active(void)
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{
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return false;
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}
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#endif /* CONFIG_SECRETMEM */
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#endif /* _LINUX_SECRETMEM_H */
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