linux-kernel - [PATCH v3 06/28] userfaultfd: wp: add helper for writeprotect check

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Message-Id: <20190320020642.4000-7-peterx@redhat.com>
Date:   Wed, 20 Mar 2019 10:06:20 +0800
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        Jerome Glisse <jglisse@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>, peterx@...hat.com,
        Martin Cracauer <cracauer@...s.org>, Shaohua Li <shli@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Marty McFadden <mcfadden8@...l.gov>,
        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: [PATCH v3 06/28] userfaultfd: wp: add helper for writeprotect check

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>
Reviewed-by: Jerome Glisse <jglisse@...hat.com>
Reviewed-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Signed-off-by: Peter Xu <peterx@...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