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From: Peter Xu <peterx@redhat.com>
Subject: [PATCH RFC 05/24] userfaultfd: wp: add helper for writeprotect check
Date: Mon, 21 Jan 2019 15:57:03 +0800
Message-Id: <20190121075722.7945-6-peterx@redhat.com>
In-Reply-To: <20190121075722.7945-1-peterx@redhat.com>
References: <20190121075722.7945-1-peterx@redhat.com>
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To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Hugh Dickins <hughd@google.com>, Maya Gokhale <gokhale2@llnl.gov>, Jerome Glisse <jglisse@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, peterx@redhat.com, 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>

From: Shaohua Li <shli@fb.com>

add helper for writeprotect check. Will use it later.

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