linux-kernel - Re: [PATCH v2 06/26] userfaultfd: wp: add helper for writeprotect check

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Message-ID: <20190221160757.GF2813@redhat.com>
Date:   Thu, 21 Feb 2019 11:07:58 -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>,
        Pavel Emelyanov <xemul@...allels.com>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v2 06/26] userfaultfd: wp: add helper for writeprotect
 check

On Tue, Feb 12, 2019 at 10:56:12AM +0800, Peter Xu wrote:
> From: Shaohua Li <shli@...com>
> 
> add helper for writeprotect check. Will use it later.
> 
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Pavel Emelyanov <xemul@...allels.com>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Shaohua Li <shli@...com>
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Jérôme Glisse <jglisse@...hat.com>

> ---
>  include/linux/userfaultfd_k.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
> index 37c9eba75c98..38f748e7186e 100644
> --- a/include/linux/userfaultfd_k.h
> +++ b/include/linux/userfaultfd_k.h
> @@ -50,6 +50,11 @@ static inline bool userfaultfd_missing(struct vm_area_struct *vma)
>  	return vma->vm_flags & VM_UFFD_MISSING;
>  }
>  
> +static inline bool userfaultfd_wp(struct vm_area_struct *vma)
> +{
> +	return vma->vm_flags & VM_UFFD_WP;
> +}
> +
>  static inline bool userfaultfd_armed(struct vm_area_struct *vma)
>  {
>  	return vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP);
> @@ -94,6 +99,11 @@ static inline bool userfaultfd_missing(struct vm_area_struct *vma)
>  	return false;
>  }
>  
> +static inline bool userfaultfd_wp(struct vm_area_struct *vma)
> +{
> +	return false;
> +}
> +
>  static inline bool userfaultfd_armed(struct vm_area_struct *vma)
>  {
>  	return false;
> -- 
> 2.17.1
>