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[ Upstream commit5ffa6e344a] There are a lot of tty-core-only functions that are listed in include/linux/tty.h. Move them to drivers/tty/tty.h so that no one else can accidentally call them or think that they are public functions. Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20210408125134.3016837-14-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Stable-dep-of:094fb49a2d("tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH") Signed-off-by: Sasha Levin <sashal@kernel.org>