userfaultfd: non-cooperative: rollback userfaultfd_exit

[mirror_ubuntu-artful-kernel.git] / fs / userfaultfd.c

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index f62199b90fd01cd78797b06cb8fd4320033e8792..16d0cc600fa9d51d308f4c87384eabcce8548af1 100644 (file)
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -775,34 +775,6 @@ void userfaultfd_unmap_complete(struct mm_struct *mm, struct list_head *uf)
        }
 }
 
-void userfaultfd_exit(struct mm_struct *mm)
-{
-       struct vm_area_struct *vma = mm->mmap;
-
-       /*
-        * We can do the vma walk without locking because the caller
-        * (exit_mm) knows it now has exclusive access
-        */
-       while (vma) {
-               struct userfaultfd_ctx *ctx = vma->vm_userfaultfd_ctx.ctx;
-
-               if (ctx && (ctx->features & UFFD_FEATURE_EVENT_EXIT)) {
-                       struct userfaultfd_wait_queue ewq;
-
-                       userfaultfd_ctx_get(ctx);
-
-                       msg_init(&ewq.msg);
-                       ewq.msg.event = UFFD_EVENT_EXIT;
-
-                       userfaultfd_event_wait_completion(ctx, &ewq);
-
-                       ctx->features &= ~UFFD_FEATURE_EVENT_EXIT;
-               }
-
-               vma = vma->vm_next;
-       }
-}
-
 static int userfaultfd_release(struct inode *inode, struct file *file)
 {
        struct userfaultfd_ctx *ctx = file->private_data;