Kernel threads are located in a completely isolated nullfs mount.
Make it possible for a kthread to create a private mount namespace so it
can mount private filesystem instances. This is only used by devtmpfs.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 drivers/base/devtmpfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index b1c4ceb65026..246ac0b331fe 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -413,7 +413,7 @@ static noinline int __init devtmpfs_setup(void *p)
 {
 	int err;
 
-	err = ksys_unshare(CLONE_NEWNS);
+	err = kthread_mntns();
 	if (err)
 		goto out;
 	err = init_mount("devtmpfs", "/", "devtmpfs", DEVTMPFS_MFLAGS, NULL);
-- 
2.47.3