s390: get rid of zeroing, switch to RAW_COPY_USER

[karo-tx-linux.git] / fs / userfaultfd.c

diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 625b7285a37be89724f76d86d643c8dd5041f57c..973607df579db324e64da1c3c26999d60853fa80 100644 (file)
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -14,7 +14,8 @@
 
 #include <linux/list.h>
 #include <linux/hashtable.h>
-#include <linux/sched.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/mm.h>
 #include <linux/mm.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
@@ -1807,17 +1808,17 @@ static void init_once_userfaultfd_ctx(void *mem)
 }
 
 /**
- * userfaultfd_file_create - Creates an userfaultfd file pointer.
+ * userfaultfd_file_create - Creates a userfaultfd file pointer.
  * @flags: Flags for the userfaultfd file.
  *
- * This function creates an userfaultfd file pointer, w/out installing
+ * This function creates a userfaultfd file pointer, w/out installing
  * it into the fd table. This is useful when the userfaultfd file is
  * used during the initialization of data structures that require
  * extra setup after the userfaultfd creation. So the userfaultfd
  * creation is split into the file pointer creation phase, and the
  * file descriptor installation phase.  In this way races with
  * userspace closing the newly installed file descriptor can be
- * avoided.  Returns an userfaultfd file pointer, or a proper error
+ * avoided.  Returns a userfaultfd file pointer, or a proper error
  * pointer.
  */
 static struct file *userfaultfd_file_create(int flags)
@@ -1847,7 +1848,7 @@ static struct file *userfaultfd_file_create(int flags)
        ctx->released = false;
        ctx->mm = current->mm;
        /* prevent the mm struct to be freed */
-       atomic_inc(&ctx->mm->mm_count);
+       mmgrab(ctx->mm);
 
        file = anon_inode_getfile("[userfaultfd]", &userfaultfd_fops, ctx,
                                  O_RDWR | (flags & UFFD_SHARED_FCNTL_FLAGS));