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	Mon, 21 Jan 2019 10:23:23 -0000
Date: Mon, 21 Jan 2019 12:23:12 +0200
From: Mike Rapoport <rppt@linux.ibm.com>
Subject: Re: [PATCH RFC 05/24] userfaultfd: wp: add helper for writeprotect
 check
References: <20190121075722.7945-1-peterx@redhat.com>
 <20190121075722.7945-6-peterx@redhat.com>
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Message-Id: <20190121102312.GD19725@rapoport-lnx>
Sender: owner-linux-mm@kvack.org
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To: Peter Xu <peterx@redhat.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hugh Dickins <hughd@google.com>, Maya Gokhale <gokhale2@llnl.gov>, Jerome Glisse <jglisse@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Martin Cracauer <cracauer@cons.org>, Denis Plotnikov <dplotnikov@virtuozzo.com>, Shaohua Li <shli@fb.com>, Andrea Arcangeli <aarcange@redhat.com>, Pavel Emelyanov <xemul@parallels.com>, Mike Kravetz <mike.kravetz@oracle.com>, Marty McFadden <mcfadden8@llnl.gov>, Mike Rapoport <rppt@linux.vnet.ibm.com>, Mel Gorman <mgorman@suse.de>, "Kirill A . Shutemov" <kirill@shutemov.name>, "Dr . David Alan Gilbert" <dgilbert@redhat.com>, Rik van Riel <riel@redhat.com>

On Mon, Jan 21, 2019 at 03:57:03PM +0800, Peter Xu wrote:
> From: Shaohua Li <shli@fb.com>
> 
> add helper for writeprotect check. Will use it later.

I'd merge this with the commit that actually uses this helper.
 
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Pavel Emelyanov <xemul@parallels.com>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Kirill A. Shutemov <kirill@shutemov.name>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Shaohua Li <shli@fb.com>
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> Signed-off-by: Peter Xu <peterx@redhat.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
> 

-- 
Sincerely yours,
Mike.