[v6,01/19] userfaultfd: wp: add helper for writeprotect check

Commit Message

Peter Xu Feb. 20, 2020, 4:30 p.m. UTC

From: Shaohua Li <[e-mail]>

add helper for writeprotect check. Will use it later.

Cc: Andrea Arcangeli <[e-mail]>
Cc: Pavel Emelyanov <[e-mail]>
Cc: Rik van Riel <[e-mail]>
Cc: Kirill A. Shutemov <[e-mail]>
Cc: Mel Gorman <[e-mail]>
Cc: Hugh Dickins <[e-mail]>
Cc: Johannes Weiner <[e-mail]>
Signed-off-by: Shaohua Li <[e-mail]>
Signed-off-by: Andrea Arcangeli <[e-mail]>
Reviewed-by: Jerome Glisse <[e-mail]>
Reviewed-by: Mike Rapoport <[e-mail]>
Signed-off-by: Peter Xu <[e-mail]>
---
 include/linux/userfaultfd_k.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

Patch

diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
index ac9d71e24b81..5dc247af0f2e 100644
--- a/include/linux/userfaultfd_k.h
+++ b/include/linux/userfaultfd_k.h
@@ -52,6 +52,11 @@  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);
@@ -96,6 +101,11 @@  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;