linux-kernel - Re: [PATCH v2 16/26] userfaultfd: wp: add pmd_swp_*uffd

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Date:   Thu, 21 Feb 2019 13:07:30 -0500
From:   Jerome Glisse <jglisse@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Martin Cracauer <cracauer@...s.org>, Shaohua Li <shli@...com>,
        Marty McFadden <mcfadden8@...l.gov>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>
Subject: Re: [PATCH v2 16/26] userfaultfd: wp: add pmd_swp_*uffd_wp() helpers

On Tue, Feb 12, 2019 at 10:56:22AM +0800, Peter Xu wrote:
> Adding these missing helpers for uffd-wp operations with pmd
> swap/migration entries.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Jérôme Glisse <jglisse@...hat.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 6863236e8484..18a815d6f4ea 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -1401,6 +1401,21 @@ 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 */
> -- 
> 2.17.1
>