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Kiryl Shutsemau (Meta)andAndrew Morton
5150233265
Userfaultfd RWP will reuse the uffd-wp PTE bit to mark access-tracking PTEs, alongside the write-protected ones it already marks. The bit's meaning now depends on the VMA flag (WP or RWP), not on its name. Rename the kernel-internal names that describe the bit: - pte/pmd/huge_pte accessors (and swap variants) - pgtable_supports_uffd() capability query - SCAN_PTE_UFFD khugepaged enum The ftrace string emitted by mm_khugepaged_scan_pmd for this enum is kept as "pte_uffd_wp" so existing trace-based tooling keeps matching. Pure mechanical rename -- no behavior change. Link: https://lore.kernel.org/20260708111417.173443-4-kirill@shutemov.name Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Assisted-by: Claude:claude-opus-4-6 Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: SeongJae Park <sj@kernel.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Hildenbrand <david@kernel.org> Cc: James Houghton <jthoughton@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Xu <peterx@redhat.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
#ifndef _ASM_GENERIC_PGTABLE_UFFD_H
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#define _ASM_GENERIC_PGTABLE_UFFD_H
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/*
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* Some platforms can customize the uffd PTE bit, making it unavailable
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* even if the architecture provides the resource.
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* Adding this API allows architectures to add their own checks for the
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* devices on which the kernel is running.
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* Note: When overriding it, please make sure the
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* CONFIG_HAVE_ARCH_USERFAULTFD_WP is part of this macro.
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*/
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#ifndef pgtable_supports_uffd
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#define pgtable_supports_uffd() IS_ENABLED(CONFIG_HAVE_ARCH_USERFAULTFD_WP)
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#endif
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static inline bool uffd_supports_wp_marker(void)
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{
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return pgtable_supports_uffd() && IS_ENABLED(CONFIG_PTE_MARKER_UFFD_WP);
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}
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#ifndef CONFIG_HAVE_ARCH_USERFAULTFD_WP
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static __always_inline int pte_uffd(pte_t pte)
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{
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return 0;
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}
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static __always_inline int pmd_uffd(pmd_t pmd)
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{
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return 0;
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}
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static __always_inline pte_t pte_mkuffd(pte_t pte)
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{
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return pte;
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}
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static __always_inline pmd_t pmd_mkuffd(pmd_t pmd)
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{
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return pmd;
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}
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static __always_inline pte_t pte_clear_uffd(pte_t pte)
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{
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return pte;
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}
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static __always_inline pmd_t pmd_clear_uffd(pmd_t pmd)
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{
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return pmd;
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}
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static __always_inline pte_t pte_swp_mkuffd(pte_t pte)
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{
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return pte;
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}
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static __always_inline int pte_swp_uffd(pte_t pte)
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{
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return 0;
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}
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static __always_inline pte_t pte_swp_clear_uffd(pte_t pte)
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{
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return pte;
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}
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static inline pmd_t pmd_swp_mkuffd(pmd_t pmd)
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{
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return pmd;
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}
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static inline int pmd_swp_uffd(pmd_t pmd)
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{
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return 0;
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}
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static inline pmd_t pmd_swp_clear_uffd(pmd_t pmd)
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{
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return pmd;
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}
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#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
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#endif /* _ASM_GENERIC_PGTABLE_UFFD_H */
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