We use kref in tty_driver.h, but do not include kref.h. It is currently included by linux/cdev.h -> linux/kobject.h -> linux/kref.h chain, so everything is in order only implicitly. So make this dependency explicit. Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> --- include/linux/tty_driver.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h index e15f8635aa36..a798e7f8890a 100644 --- a/include/linux/tty_driver.h +++ b/include/linux/tty_driver.h @@ -233,6 +233,7 @@ #include <linux/export.h> #include <linux/fs.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/cdev.h> #include <linux/termios.h> -- 2.32.0