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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@suse.cz> Link: https://lore.kernel.org/r/20210723103147.18250-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>