From: Peter Xu <peterx@xxxxxxxxxx> Subject: userfaultfd: wp: add pmd_swp_*uffd_wp() helpers Adding these missing helpers for uffd-wp operations with pmd swap/migration entries. Link: http://lkml.kernel.org/r/20200220163112.11409-10-peterx@xxxxxxxxxx Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx> Reviewed-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Bobby Powers <bobbypowers@xxxxxxxxx> Cc: Brian Geffon <bgeffon@xxxxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: Denis Plotnikov <dplotnikov@xxxxxxxxxxxxx> Cc: "Dr . David Alan Gilbert" <dgilbert@xxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx> Cc: Martin Cracauer <cracauer@xxxxxxxx> Cc: Marty McFadden <mcfadden8@xxxxxxxx> Cc: Maya Gokhale <gokhale2@xxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Cc: Pavel Emelyanov <xemul@xxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Shaohua Li <shli@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/pgtable.h | 15 +++++++++++++++ include/asm-generic/pgtable_uffd.h | 15 +++++++++++++++ 2 files changed, 30 insertions(+) --- a/arch/x86/include/asm/pgtable.h~userfaultfd-wp-add-pmd_swp_uffd_wp-helpers +++ a/arch/x86/include/asm/pgtable.h @@ -1424,6 +1424,21 @@ static inline pte_t pte_swp_clear_uffd_w { 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 --- a/include/asm-generic/pgtable_uffd.h~userfaultfd-wp-add-pmd_swp_uffd_wp-helpers +++ a/include/asm-generic/pgtable_uffd.h @@ -46,6 +46,21 @@ static __always_inline pte_t pte_swp_cle { 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 */ _
