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    Subject[PATCH v6 09/19] userfaultfd: wp: add pmd_swp_*uffd_wp() helpers
    Date
    Adding these missing helpers for uffd-wp operations with pmd
    swap/migration entries.

    Reviewed-by: Jerome Glisse <jglisse@redhat.com>
    Reviewed-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
    Signed-off-by: Peter Xu <peterx@redhat.com>
    ---
    arch/x86/include/asm/pgtable.h | 15 +++++++++++++++
    include/asm-generic/pgtable_uffd.h | 15 +++++++++++++++
    2 files changed, 30 insertions(+)

    diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
    index 74f16d7e5b47..75a04ac97ef2 100644
    --- a/arch/x86/include/asm/pgtable.h
    +++ b/arch/x86/include/asm/pgtable.h
    @@ -1427,6 +1427,21 @@ static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
    {
    return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
    }
    +
    +static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
    +{
    + return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
    +}
    +
    +static inline int pmd_swp_uffd_wp(pmd_t pmd)
    +{
    + return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
    +}
    +
    +static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
    +{
    + return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
    +}
    #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */

    #define PKRU_AD_BIT 0x1
    diff --git a/include/asm-generic/pgtable_uffd.h b/include/asm-generic/pgtable_uffd.h
    index 643d1bf559c2..828966d4c281 100644
    --- a/include/asm-generic/pgtable_uffd.h
    +++ b/include/asm-generic/pgtable_uffd.h
    @@ -46,6 +46,21 @@ static __always_inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
    {
    return pte;
    }
    +
    +static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
    +{
    + return pmd;
    +}
    +
    +static inline int pmd_swp_uffd_wp(pmd_t pmd)
    +{
    + return 0;
    +}
    +
    +static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
    +{
    + return pmd;
    +}
    #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */

    #endif /* _ASM_GENERIC_PGTABLE_UFFD_H */
    --
    2.24.1
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