1 files changed, 3 insertions, 0 deletions

diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
index b742c40c2880..3b059530dac9 100644
--- a/include/uapi/linux/userfaultfd.h
+++ b/include/uapi/linux/userfaultfd.h
@@ -21,6 +21,7 @@
 #define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK |            \
                            UFFD_FEATURE_EVENT_REMAP |           \
                            UFFD_FEATURE_EVENT_REMOVE |  \
+                           UFFD_FEATURE_EVENT_UNMAP |           \
                            UFFD_FEATURE_MISSING_HUGETLBFS |     \
                            UFFD_FEATURE_MISSING_SHMEM)
 #define UFFD_API_IOCTLS                         \
@@ -110,6 +111,7 @@ struct uffd_msg {
 #define UFFD_EVENT_FORK         0x13
 #define UFFD_EVENT_REMAP        0x14
 #define UFFD_EVENT_REMOVE       0x15
+#define UFFD_EVENT_UNMAP        0x16
 
 /* flags for UFFD_EVENT_PAGEFAULT */
 #define UFFD_PAGEFAULT_FLAG_WRITE       (1<<0)  /* If this was a write fault */
@@ -158,6 +160,7 @@ struct uffdio_api {
 #define UFFD_FEATURE_EVENT_REMOVE               (1<<3)
 #define UFFD_FEATURE_MISSING_HUGETLBFS          (1<<4)
 #define UFFD_FEATURE_MISSING_SHMEM              (1<<5)
+#define UFFD_FEATURE_EVENT_UNMAP                (1<<6)
         __u64 features;
 
         __u64 ioctls;