This is a note to let you know that I've just added the patch titled tty: hvc: fix link error with CONFIG_SERIAL_CORE_CONSOLE=n to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tty-hvc-fix-link-error-with-config_serial_core_conso.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a74606cdbc02551fe5b03e8efecb7a5a662827ec Author: Yang Yingliang <yangyingliang@xxxxxxxxxx> Date: Sat Sep 19 14:35:35 2020 +0800 tty: hvc: fix link error with CONFIG_SERIAL_CORE_CONSOLE=n [ Upstream commit 75fc65079d8253e1c25a5f8348111a85d71e0f01 ] aarch64-linux-gnu-ld: drivers/tty/hvc/hvc_dcc.o: in function `dcc_early_write': hvc_dcc.c:(.text+0x164): undefined reference to `uart_console_write' The driver uses the uart_console_write(), but SERIAL_CORE_CONSOLE is not selected, so uart_console_write is not defined, then we get the error. Fix this by selecting SERIAL_CORE_CONSOLE. Fixes: d1a1af2cdf19 ("hvc: dcc: Add earlycon support") Reported-by: Hulk Robot <hulkci@xxxxxxxxxx> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> Link: https://lore.kernel.org/r/20200919063535.2809707-1-yangyingliang@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig index d1b27b0522a3c..8d60e0ff67b4d 100644 --- a/drivers/tty/hvc/Kconfig +++ b/drivers/tty/hvc/Kconfig @@ -81,6 +81,7 @@ config HVC_DCC bool "ARM JTAG DCC console" depends on ARM || ARM64 select HVC_DRIVER + select SERIAL_CORE_CONSOLE help This console uses the JTAG DCC on ARM to create a console under the HVC driver. This console is used through a JTAG only on ARM. If you don't have